Forrest M. Mims III posts this quick and easy project on Jameco’s website demonstrating how to make a simple two-way opto-isolator using two LEDs.
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Forrest M. Mims III posts this quick and easy project on Jameco’s website demonstrating how to make a simple two-way opto-isolator using two LEDs.
Using LED’s for detection is neat, you see it a lot in solar trackers. But the circuit shown here isn’t really helpful for bi-directional operation, I think.
You’d tie the cathode to an IO pin so you can pull it to Vcc or ground as needed, and then use another IO pin to switch between Vcc and Hi-Z (no pullup) on the anode, and leave the receiving circuit attached at all times. Only downside is when transmitting, the input to the 4011 might be in a linear range.
Might be possible to feed the input directly into a microcontroller too, as long as the pullup can be disabled. You are using 3 io pins, but it eliminates the extra IC.
that’s a one way circuit, any links to a two way?
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The LED is also a Photo-diode. Can you dig it. Can you dig it?