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Trigger TRIAC With Photo Resistor — Parallax Forums

Trigger TRIAC With Photo Resistor

BonesBones Posts: 3
edited 2009-05-21 20:04 in General Discussion
Not sure where exactly this should go but I have a circuitry question.

I have a TRIAC which I am using to control a lamp. As of now I have the TRIAC setup to be triggered when there is no light on the photoresistor. So when the resistance decreases past the trigger it turns the circuit on. But I need this to work the opposite way. I want to make it so that the TRIAC is triggered by an increased resistance instead of a decrease. This way the TRIAC is only triggered when there is light supplied to the photoresistor.

Any help on making this would would be greatly appreciated.

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