Blew up two op-amps before I noticed I had the supply rails backwards (doh) but got a light change detector working using the circuit at http://www.ee.teihal.gr/labs/electronics/web/downloads/passive-optical.pdf
Thought perhaps it might be interesting to put the photodiode in front of the viewfinder of a camera pointed at a photogenic perch, to ave it fire of a burst of shots should a bird happen to land on it...
The detector seems sensitive enough that it might just work, though seemed to take a lot longer to turn off again than I expected.
I wonder if I swapped the inputs to the first op-amp, would it act as a slave flash trigger / lighning detector?
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