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Reply to "IR or Optical Sensors"

Stan, I did a more playing. Used your above 'top' circuit with the transistor and also stuff you provided from earlier IR detection circuits. I put a diode between the (2) 10K resistors and a 4.7 uf cap from the diode output to ground. This kinda worked, in that when beam is made, trigger output (only connected to meter--won't trigger relay) very slowly (20-30 sec.) drops close to zero. When broken, fairly quickly rises to almost 5V. That's a pretty small cap and a very long decay time. How best to adjust to something like 2-3 sec. to decay to close to zero? The relay not triggering not an issue since that output will be an arduino input--again using the AC input pins.

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