This module is sensitive to the light, usually used for detecting the ambient brightness and light intensity.When there is no light or the light intensity can not reach the value, DO output is high level. When light intensity over than the value, the module DO output is low level. The module digital output DO can be directly connected with the microcontroller, use microcontroller so that it can detect the environmental light intensity change. The analog output AO connects with AD module, and it can get more precise light intensity value through the AD converter.
VCC: positive power supply 3.3-5V
GND: power supply is negative
DO: TTL switching signal output
AO: analog output