Light sensor is one of the most common sensors. The kinds are diverse, such as photoelectric tube, photomultiplier tube, photosensitive resistor, photosensitive triode, solar cell, infrared sensor, etc.
The working principle of idr sensors is based on internal photoelectric effect. Ldr sensor is formed by installing electrode leads at both ends of a semiconductor photosensitive material and encapsulating them in a shell with a transparent window.
Idr sensor (photoresistor light-dependent resistor, and the latter is abbreviated as ldr) or photoconductor,is commonly made of cadmium sulfide, as well as selenium, aluminium sulfide, lead sulfide and sulfide.