CHDK - альтернативная прошивка

It wasn't too difficult to get a prototype system up and running - see
http://www.youtube.com/watch?v=6LcDRZh4Zuo

An explanation: Connected to the PIC chip are three microswitches; set in this instance to 'zoom in', 'shoot', 'zoom_out'. When the PIC detects that a button has been pressed or released it generates an instruction code - in this case, 0 for nothing, 1 for shoot, 2 for zoom in, 4 for zoom out, and transmits this integer byte by sending an interrupt pulse, followed by the 8 bits, to the camera. The script on the camera decodes the 8 bits to an integer value and checks it against its list of instruction codes, then performs the relevant action.

The timing is all handled in uBASIC and is extremely unreliable at the moment though, so needs a good CHDK programmer to embed a routine in the firmware itself. Hopefully someone will take up the torch on this one, because I'm not sure I'll have enough time to devote to it.

I'll upload code somewhere when I can, but email me at simon-dot-taylor-dot-uk-at-gmail-dot-com if you have any technical questions.