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Logic high/low

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MikeMl

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I'd wire it as in the train detector, but put a second inverter after the first. That would give you the high.

If you can move the load resistor to the collector of the photo-transistor, then you can do it with only one Schmitt inverter.
 

MikeMl

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Most Helpful Member
Probably not, because the transition from on/off off/on will be not be a clean logic transition, will be too slow, and because of the low-gain optointerupter, will float around near the trip-point being modulated by 120Hz incident light.
 
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