Combined Light-/Dark-Activated Switch Circuit

Posted on Feb 24, 2013

Two op amps used in a bridge circuit configuration detect high and low light levels. Potentiometer R2 sets the dark level and Rl controls the light level. R3 is set so that about lA the supply voltage appears across R4 at the desired light level.

Combined Light-/Dark-Activated Switch Circuit
Click here to download the full size of the above Circuit.

Rl and R2 set the trip point of the optoisolator 1C2 at darker or lighter ambient levels, as required.

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