This compact photocell is a tiny yet powerful light sensor. Also known as a photodetector, photo resistor, CdS or photoconductive cell, it changes resistance according to the amount of light it receives. These small sensors are excellent for triggering actions based on ambient light, like performing a task when the room lights turn on. Features include a light resistance of about 1k Ohm, a dark resistance of around 10k Ohm, a maximum voltage of 150V, and a maximum power of 100mW. Its dimensions are 2 x 4 x 5mm, with a 4mm gap between pins and a 31mm lead length. Available documents are the datasheet, hookup guide, and Bildr tutorial.
Using this photocell is easy. First, connect it according to the hookup guide. You can use it as an ambient light trigger, for example, to control a device when the light level changes in a room. When handling it, be careful not to apply a voltage higher than 150V or power greater than 100mW, as this could damage the sensor. Keep it away from extreme temperatures and moisture. To maintain it, just make sure it's clean and free from dust. Check the datasheet regularly for any specific technical details.
