Adafruit Industries, Unique & fun DIY electronics and kits Photo cell (CdS photoresistor) : ID 161 - CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When it's light, the resistance is about ~1KΩ, when dark it goes up to ~10KΩ.To use, connect one side of the photocell (either one, it's symmetric) to power (for example 5V)
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