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IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same price RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size. DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same price RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size. DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
DECEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during December 2015. The idea here is to print on analog photo paper using an LED. Result. The first successful proof of concept is shown below, left the original data, right a scanned version of the printout (it’s mirrored and the aspect ratio is not spot on). RPI | IHAVETOOMUCHTIME Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and atemperature sensor.
UNCATEGORIZED
A usually good rule of thumb is the rule of 600, which says that shutter speeds faster than 600/ f, with f being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earthsrotation
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
UNCATEGORIZED
A usually good rule of thumb is the rule of 600, which says that shutter speeds faster than 600/ f, with f being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earthsrotation
PHOTO | IHAVETOOMUCHTIME Posts about Photo written by philippeller. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks for itself. HARDWARE | IHAVETOOMUCHTIME RPi Alarm Clock. August 24, 2015. August 25, 2015 ~ philippeller. ~ Leave a comment. Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Front view of the alarm clock; it’s 5IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
UNCATEGORIZED
A usually good rule of thumb is the rule of 600, which says that shutter speeds faster than 600/ f, with f being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earthsrotation
PHOTO | IHAVETOOMUCHTIME Posts about Photo written by philippeller. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks for itself. HARDWARE | IHAVETOOMUCHTIME RPi Alarm Clock. August 24, 2015. August 25, 2015 ~ philippeller. ~ Leave a comment. Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Front view of the alarm clock; it’s 5IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size. RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same price MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same price AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size. RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
DECEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during December 2015. The idea here is to print on analog photo paper using an LED. Result. The first successful proof of concept is shown below, left the original data, right a scanned version of the printout (it’s mirrored and the aspect ratio is not spot on). OUT034 | IHAVETOOMUCHTIME Visit the post for more. Notify me of new comments via email. Notify me of new posts via email. DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six pushRPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
NOVEMBER | 2015 | IHAVETOOMUCHTIME 1 post published by philippeller during November 2015. When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size.IHAVETOOMUCHTIME
The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
HARDWARE | IHAVETOOMUCHTIME Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and atemperature sensor.
UNCATEGORIZED
A usually good rule of thumb is the rule of 600, which says that shutter speeds faster than 600/ f, with f being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earthsrotation
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
IHAVETOOMUCHTIME
What usually works well is Aquarell paper. To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so ABOUT | IHAVETOOMUCHTIME Building little gadgets, experimenting with photography and programming is fun. I'm trying to document some of the stuff I made here to inspire others or help if somebody intends to do somethingsimilar.
LED PHOTO PRINTER
Optics. The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into thisround, black part
MAKING OF A CYANOTYPE The Chemicals Recipes for cyanotype chemicals can be found all over the internet, it's more or less always the same: 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A 10g of potassium ferricyanide dissolved in 100 ml distilled water for solution B Don't buy expensive cyanotype sets, for the same priceRASPBERRY PI
Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push RASPBERRY PI AUTOGUIDER raspberry pi with the necessary connections. The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium, but this has nothing to do with theguiding.
AUGUST | 2015 | IHAVETOOMUCHTIME August 29, 2015. August 29, 2015 ~ philippeller. ~ Leave a comment. The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks foritself.
RPI ALARM CLOCK
Ok, this is not an alarm clock, fine. You could call it an interface to my "home-automation" system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and a temperature sensor. Usage What is this all good for? Well, first of all it tellsme the time and
RPI X-RAY | IHAVETOOMUCHTIME I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper. The coloringis just
DVELOPPING FILM IN COFFEE The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of FujiAcros 100
HARDWARE | IHAVETOOMUCHTIME Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and atemperature sensor.
UNCATEGORIZED
A usually good rule of thumb is the rule of 600, which says that shutter speeds faster than 600/ f, with f being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earthsrotation
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LED PHOTO PRINTER
December 11, 2015
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The idea here is to print on analog photo paper using an LED.RESULT
The first successful proof of concept is shown below, left the original data, right a scanned version of the printout (it’s mirrored and the aspect ratio is not spot on).THE HARDWARE
The easiest and lowest cost way I saw to do that was to reuse the mechanical assembly of an old inkjet printer, here a salvaged HP Deskjet 3940. Everything than the paper feed and print head slider with the according two DC motors and encoders was ripped out. I had to build two prototyping boards to mount the little Agilent encoders in the right position (yellow boards in the photos) printing head with strip encoder rotary encoderELECTRONICS
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I’m using an L293B motor driver from ST, which is basically an H-bridge to enable the control of both directions of the motors, it’s just needed to ad a couple of diodes. Here a circuit diagram. wiring of the two DC motors (image from calamarocorp.blogspot.ch) the setup with the printing unit, electronics and controller The output of the little encoders is already digital, although one of them seemed to be somehow broken….however, feeding the tiny signal that was left into an op-amp fixed the issue. The whole thing is hooked up to an external power supply providing 12 V for the motors and 5 V for the logic. As a controller I used a STM32 nucleo board, these are like arduinos on steroids, and cost only 10$.OPTICS
The exposure of the paper is done using a small white LED, that is controlled over PWM. One of the challenges is to focus the light in a small spot on the paper – this is the most limiting factor for the printing resolution. I got it down to about 40 um diameter using some parts of an old camera lens fitted into this round, black part shownon the photo below.
the printhead with the optical assemblySOFTWARE
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The nucleo boards are mbed.org enabled. This is a developing platform with a lot of tools and existing libraries. printer in action (10 lines in daylight) PRINTING AND DEVELOPING This is the usual 2 baths b/w paper developing process. Here are some examples of freshly developed and watered prints. some failed attempts (from left to right): inverted value printed in both directions, bit manipulation bug (bit order), buffer overflow freshly developed andwatered print
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RASPBERRY PI AUTOGUIDER November 20, 2015November 20, 2015~ philippeller
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When taking photographs of the nightsky, the problem is evident that the rotation of the earth becomes a problem after a certain exposure length, depending on the focal length and the pixel size. A usually good rule of thumb is the _rule of 600_, which says that shutter speeds faster than 600/_f_, with _f_ being the focal length, will deliver images without trailing. On a telescope with 600 mm focal length this is 1 second, which is good for photos of the moon. To get photos of dimmer objects, we need to compensate for the earths rotation using a telescope mount with at least one motor. This can, depending of the goodness of the polar alignement, deliver already very satisfying results. However, for lazy people like me or also places like my balcony without a view of polaris, this is not an option and the starts typically start trailing after around a minute. The autoguider to the rescue! It tracks a star and computes corrections, that are fed back to the motor control. Here I present probably the WORLD’S CHEAPEST AUTOGUIDER. Total material budget of about 100$ including guide scope and mount andeverything.
TELESCOPE SETUP
My used telescope setup is a Megrez 90mm doublet APO, mounted on a Vixen GP-DX mount with both axis stepper motors controlled by a SkySensor 2000 (SS2K).
Megrez 90 on a Vixen GP-DX and the autoguider, on my Zurichbalcony
AUTOGUIDER
The autoguider is a low budget project. I built it from an old photographic tele lens, from which I took off the rear part and fitted in a cheap chinese 2x Barlow plus a Webcam with detached lens. To be able to point it to a bright star in the vincinity of the actual deep sky object (DSO), I mounted it using two pipe clamps. The adjustment is done over 6 screws, threaded into the metal clamps.Autoguider
The brain of the autoguider is a raspberry pi. I built in two optocouplers connected to GPIO pins, a 4x one for the feedback to the SS2K, and a single one to trigger the camera remote of my DSLR. (In case of other cameras it is easier to use gphoto2 and fully remote control the camera, but my model is not supported.) raspberry pi with the necessary connections The SS2K provides several in- and outputs. The autoguider port is the accepts control pulses from the optocoupler hooked to raspberry pi GPIO pis over an RJ11 cable. There is also a serial port, that I use to control the telescope over Stellarium , but this has nothing to do with the guiding.Report this ad
SS2K controller
The autoguider connection is different from the normal ST-4 pin connection! See the excerpt from the SS2K manual below. Page from the Vixen SS2K manual Of course software is required, that actually calculates the correction pulses for the mount. I use lin_guider that is doing a great job, see screenshot. It allows to configure it to use the GPIO pins. I actually had to make a change in the source file for the GPIO control, because in my case there was a bug with the +/- direction and signs.Report this ad
Below is a screenshot of the guiding running. I use X window forwarding over ssh to do initiate the tracking. Screenshot of lin_guider controlling my mountRESULTS
Here are two examples of deep sky pictures I made using the described autoguider setup. They contain single frames with exposure times of up to 10 minutes without any trailing visible at all.Orions nebula
M42
Andromeda Galaxy M31SHARE THIS:
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DVELOPPING FILM IN COFFEE August 29, 2015August 29, 2015~ philippeller
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The so-called caffenol developer is based on household ingredients. I used the C-M recipe so far, with Nescafe Gold. Here is a scan of Fuji Acros 100 developed in it for 15 minutes, the result speaks for itself.Fuji
Acros 100 in Caffenol C-MSHARE THIS:
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MAKING OF A CYANOTYPE August 29, 2015August 29, 2015~ philippeller
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final
THE CHEMICALS
Recipes for cyanotype chemicals can be found all over the internet, it’s more or less always the same: * 25g of ammonium iron(III) citrate dissolved in 100 ml distilled water for solution A * 10g of potassium ferricyanide dissolved in 100 ml distilled waterfor solution B
Don’t buy expensive cyanotype sets, for the same price you can get a lifetime supply from ebay. The 18% iron one i’m using just works perfectly (other sites suggest to use more expensive ‘green’ salt)stuff
needed
The mixing of the chmicals does not require pedantic precision, it will work if you are off even by 10 %.Solution
B mixed and ready to put away in a storage flaskTHE PAPER
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A factor that influences the results way more is the paper. I tried a dozen of different types and brands. The tonal range and the quality of the blue heavily depend on it. What usually works well isAquarell paper.
To prepare it, mix equal amounts of solution A and B together, and apply them on the paper. For the obvious reason this should not be done in bright daylight. I use a sponge, which gave me the best results so far to evenly distribute the solution over the paper. Then i let them dry over night in a dark room.EXPOSURE
You’ll need direct sunlight. The paper changes color really quick from first yellow to blue, and later to almost a gray. The gray parts will be dark blue after development. It usually takes 5 – 15 minutesto expose.
exposure
DEVELOPPING
The developping is very easy, just wash it in water, until no yellow is left on the paper or the water.after
washing
DRYING
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Make sure the paper doesn’t wave. I tape it down on a glass platewith Aquarell tape.
drying
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RPI X-RAY
August 25, 2015August 25, 2015~
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I thought it would be fun to look inside a Raspbery Pi. There are x-ray images available on the web, but all with pretty bad resolution. So I took one to the lab and x-rayed it onto a photopaper. In this case 50 kV x-rays for 400 sec on Ilford Multigrade paper.colored
x-ray image of RPi
The coloring is just a gradient map, to better highlight the different PCB tracks and components. More versions and other x-ray images can be found on my flickr page.
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RPI ALARM CLOCK
August 24, 2015August 25, 2015~
philippeller
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Ok, this is not an alarm clock, fine. You could call it an interface to my “home-automation” system. It provides a 4 x 7-segment display, six status LEDs, six push-buttons, two 230 V relays and atemperature sensor.
Front
view of the alarm clock; it’s 5 past 8 and there is an alarm set, the sound system in my flat and relay 1 are on.USAGE
What is this all good for? Well, first of all it tells me the time and other information (is an alarm set, did i push snooze, is my HiFi system on, etc…), and it provides me with some physical buttons for example to turn on or off the lights in my apartment or to shut down everything when going to sleep.DESIGN CHOICES
A simple clock with buttons and LEDs could be implemented much easier and smaller with a micro controller. The reason I went instead with a Raspberry Pi is the availability of an ethernet controller and the possibility of using rather high level python on the software side. This allows to use the Pyro4 library, on which my home automationsystem is based on.
The red LED 7-segment display is recycled from my old alarm clock, since I liked the size and color, and was already used to itsappearance.
Everything is placed on prototyping boards, hence the many cables.inside
view from top, the display driver logic is hiding under the elevated board for the buttonsOSCILLATOR
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The old 7-segment display I recycled uses a two anode wiring scheme, to cut the amount of contact pins in half. This means that you have two anodes, each for half of the 28 segments, and need only 14 cathodes. It is effectively tricking the human eye by switching fast enough between the two anodes to achieve a display of all possible configurations. This requires switching above at least 100 Hz, better in the kHz range. To remove this task from the RPi, which would be a heavy CPU load, I implemented a switching circuit using an LM555 as an oscillator in the kHz range.front
without mask and cover, revealing the display and the status LEDsDISPLAY DRIVER
Maybe one could call it a bit overkill, but I decided to build a display driver from 74x TTL logic. More precisely the 74HC595 ICs, which are 8bit SiPo Shift Registers with a latched 3-state output (high, low and a high impedance Z state). These makes it possible to drive the outputs by the before mentioned oscillator. For half of the registers, the oscillator signal is inverted, using a standard 74x inverter. The latches allow to have the last state saved, while shifting in a new state. The different registers are all hooked together in serial. And in total just occupy 4 GPIO ports from the RPi, a DATA, CLK, LATCH and CLR – serial data, clock, latch andclear.
these
guys here
To actually drive the LEDs, additional npn transistors are hooked up to them with the signal at the Base.Report this ad
TEMPERATURE SENSOR
Since I had a couple of 1-wire temperature sensors lying around anyway, I connected one to the RPi. They can be used with the w1-gpio and w1-therm kernel modules. Turns out to be not the best choice, since they work completely unreliably.showing
the ambient temperature after a button pressRELAYS
In addition, I wanted to be able to control the lamp on my nightstand remotely and by buttons, therefore i wired up two mono-stable relays to the GPIOs (one is a spare for a possible other device).BUTTONS
The Buttons are directly connected over the 3.3 V rail to GPIO pins, which are ground referenced by some pull-down resistors. To debounce and to remove cross-talk, I soldiered a few capacitors across theswitches.
POWERING
The whole thing is Powered by an external 5 V power supply. First I hooked up the RPi also over the GPIO header 5 V nd GND pins. This turned out to be a major design flaw. Although I filter the voltage in the beginning, there is too much noise, probably from the oscillator, on the RPi and it would freeze after some time when powered up. One needs to use the USB port, which provides additional filters (and a polyfuse). This fixed everything.HOUSING
The electronics is packed in a standardized housing from anodized Aluminum. I made holes in the top, where small metal cylinders are placed above the buttons. The back and front are made from acrylic glass, that I cut with a laser. There is also a black mask with the icons (also laser cut) and a diffusor foil behind the front panel.laser
cut parts: A support bar for the elevated buttons board, the rear and front panels and the mask for the display and status LEDsSOFTWARE
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All my code is publicly available here , but not in an well documented and organized state. Here I just want to outline the important parts. The class register below is all that’s needed to control the display. It provides the method set, which inputs any number in binary form into the shift registers, and in the end latches it. class register(object):BITS = 40
def __init__(self,clk,clr,data,latch): self.CLK = output(clk) self.CLR = output(clr) self.DATA = output(data) self.LATCH = output(latch)self.clear()
def clear(self):
self.CLR.state = Falseself.CLK.tick()
self.CLR.state = Truedef set(self,val):
self.clear()
self.LATCH.tick()
bits =
for pos in range(0,self.BITS): bits.append(bool(val>>pos & 1))self.clear()
for bit in bits:
self.DATA.set(bit)
self.CLK.tick()
self.LATCH.tick()
def __del__(self):
self.clear()
self.LATCH.tick()
To facilitate the operations on the GPIO pins, i use the following class. class output(object): def __init__(self,pin,ini=False):self._pin = pin
self._state = ini
GPIO.setup(self._pin,GPIO.OUT) GPIO.output(self._pin,self._state)@property
def state(self):
return self._state
@state.setter
def state(self,val): if not val == self._state:self._state = val
GPIO.output(self._pin,self._state)def set(self,val):
GPIO.output(self._pin,val)self._state = val
def tick(self):
GPIO.output(self._pin,True) GPIO.output(self._pin,False)def switch(self):
self.state = not self.statedef __repr__(self):
return 'pin %s, state %s'%(self._pin,self._state)Report this ad
More details on the project will follow…if you have any question, just post a comment!SHARE THIS:
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