
Easily measure light levels with a a photoresistor!

Phototransistors are semiconductors that change properties based on ambient visible light intensity. Perfect for inexpensive daylight sensors, and light-based triggers.


Why sit around and reflect when you can use this sensor? Perfect for line or object detection.










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 5-10KΩ, when...


























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