retrolefty:
[quote author=Papa G link=topic=160464.msg1201554#msg1201554 date=1365991113]
I see how you got confused. Notice they are biasing the phototransistor to switch faster rather than act more linearly. I don't know what the purpose of the Olimex circuit is. It's an optically coupled OR-gate that resets the processor for whatever reason I don't know.
Not quite. It's poorly drawn. Note that each opto collector has a I1, I2, I3, or I4 label. These wire over to digital input pins on the processor chip.
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lol, no I mean the schematic posted with reply #26.