This category contains a broad range of sensors that measure or detect any kind of light, whether visible or not. These include things like light-dependent resistors, color sensors, passive infrared motion detectors, UV sensors, X-band microwave sensors and laser range finders.

For image sensors complete with lenses for the purpose of taking photos or video, see our Cameras category.

If you’re planning on building a device with sensors, check out the Waspmote open-source wireless sensor networking platform.