[chbot] AVRcam lighting

[Andrew Errington]

Peter (and anyone else who is interested),

At the last meeting we talked about hooking up a light to the AVRcam to 
improve the tracking.  I just looked at the AVRcam schematic, and the VSYNC 
signal from the camera is hooked up to an interrupt pin on the AVR.  You 
could buffer that signal and use it to switch a high powered LED on and off 
(30 times a second).  It would be in sync with the camera, and you would 
save power by only having the LED on during a frame (i.e. not a 100% duty 
cycle), plus you could overdrive the LED to make it *really* bright for 
that short time.

Andrew