1PCS Optical Sensitive Resistance Light Detection Photosensitive Sensor Module for arduino 4pin DIY Kit

Please notice:If you choose China Post Ordinary Small Packet Plus,the tracking information will only shows in the order page and do not have a tracking number.If you want monitor the whole transit process,please choose other shipping method like China Post Registered Air Mail.    We won't accept dispute if youchosen China Post Ordinary Small Packet Plus and ask a tracking number. 1 photosensitive resistance module's most sensitive to ambient light, commonly used to detect environment around the brightness of the light, or MCU trigger relay module, etc.; 2 module in the environment light intensity than set threshold, output high level DO end, when the environment light intensity more than set threshold, the DO output low level; 3 the DO output can be directly connected to microcontroller, through single chip microcomputer to detect the high and low level, thus to detect the environment light intensity change; 4 the