Hacking a webcam for long exposure astrophotography

I finally got around to hacking a Philips SPC 900 to enable it to take long exposure images suitable for astrophotography. The modifications are fairly well known. The approach I took is a mixture of the http://www.boltonastro.org.uk/Members%5FArea/Projects/spc880conversion.pdf from Bolton Astronomical Society and http://www.yesyes.info/index.php/diy/philips-spc900-webcam-lx-and-ampoff-mod/ .

The circuit between both approaches is roughly the same, I followed the circuit in the former. The modification allows the camera to be switched to a long exposure mode via a switch. The switch can be triggered over a serial port, so I added a USB to serial adaptor and a USB hub (both from ebay) to the unit to allow control from a computer and have just one cable coming from the unit. Read more

Old computer magazines free to a good home

I’m clearing out the attic and have some old computer magazines that some of you might be interested in. Free to a good home if you can collect from me, otherwise they go to recycling.

The first batch contains titles like Personal Computer News and Your Computer from around 1981-1983. The second batch are mainly Amiga Shopper (and the odd CU Amiga and Amiga Format) from around 1994.

UPDATE: All gone! Read more

Philips SPC900 Mods

A collection of some of the main pages describing the long exposure and amp mods for the SPC900 webcam. http://home.zonnet.nl/m.m.j.meijer/D_I_Y/spc900nc.htm http://www.yesyes.info/index.php/diy/philips-spc900-webcam-lx-and-ampoff-mod/ http://stargazerslounge.com/astro-lounge/114129-pictures-taken-during-some-lx-mono-mods.html http://www.boltonastro.org.uk/Members%5FArea/Projects/spc880conversion.pdf Now just to read through them all, order the bits I need, and do the mod. Simples.   Read more

Python : generating unittests on the fly

When creating python unit tests you need to create a method in a unittest class. The problem however is when you don’t know until the code is running what these tests will be. In my particular case I need to run a series of tests against a number of Solaris packages. But I won’t know what the packages will be in advance. Read more