Arduino Timelapse Intervalometer/SLR Controller II - With Sensor Triggering

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I decided to do an upgrade to my Canon SLR timelapse controller (originally poster here: http://www.youtube.com/watch?v=sPGVQnzNtw4), adding the ability to start timelapse or trigger photos with a sensor. In this case, I used a photoresistor as the sensor, but you could use anything.

The code is at: https://drive.google.com/open?id=0B0Swx_1rwA6Xb1RQbnItMng4c0k
And the printed circuit (Express PCB format): https://drive.google.com/open?id=0B0Swx_1rwA6XMGl5b1JITHhqM1E - I've packed 3 of them on one board, getting 9 from one order. The pins for the arduino assume that you're plugging in an Ardweeny (https://solarbotics.com/product/kardw/) to those pins. All you have to do is apply 5V to the far right-hand side pins (labeled V+ and GND.)
An image of the PCB: http://foodini.org/arduino/camera_trigger4.jpg

I'll get some sensor-triggered photos and videos up eventually, but for now:
One of my timelapses: http://www.youtube.com/watch?v=WeW7E8fecZA
Another timelapse: http://www.youtube.com/watch?v=cRWzkinNd9I

(Feb 10, 2014) I've made some changes to the behavior since shooting this video. Rendering to the LCD takes about 16ms, so I did some ugly trickery with the code to make it optional. See the comments at the top of the source file.
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