
Easily measure light levels with a a photoresistor!



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...





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

A well-rounded pack including all of the passives you need to get started!












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