1.Photosensitive resistance sensor module is very sensitive to light of environmental. It is generally used to detect the brightness of ambient light.
2.When the brightness of ambient light is lower than the set threshold value, the relay attracts to close and the common port and normal open port will be connected; while the brightness of the ambient light exceeds than the set threshold value, the relay breaks off and the common port and normal close port will be connected.
3.The common port, normal open and normal close port are equivalent to a double control switch. When there is electricity in the relay coil, the common port and normal open port are connected while there is no electricity in the relay coil, the common port and normal close port are connected.
