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CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about 5-10K?, when dark it goes up to 200K?.
To use, connect one side of the photo cell (either one, its symmetric) to power (for example 5V) and the other side to your microcontroller's ****og input pin. Then connect a 10K pull-down resistor from that ****og pin to ground. The voltage on the pin will be 2.5V or higher when its light out and near ground when its dark.
CdS photocells are not RoHS compliant, so if you need something equivalent but RoHS compiant, check out the photo transistor.
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