Using the sensitive type photosensitive resistance sensor. The comparator output, signal clean, good waveform, driving ability is strong, for more than 15MA. The working voltage of 3.3 V to 5 V, The output form: digital switch output (0 and 1). With adjustable potentiometer can adjust and detect the brightness of the light. It is of good directivity and can detect light of fixed direction. With bolt holes for easy installation. Module instructions 1. The photosensitive resistance module's most sensitive to ambient light, generally used to detect the environment around the brightness of the light, or MCU relay module, etc.; 2. Module in the environment light intensity short of setting threshold, output high level DO end, when the environment light intensity more than set threshold, output DO low level; 3. The DO output can be attached directly to the single chip microcomputer, through single chip microcomputer to detect the high and low level, thus to detect the environment light intensity change; 4. The DO output can be directly driven our relay module, which can form a light-operated switch. Specification: Size: 48 x 8mm/1.9 x 0.6 x 0.3inch Package Includes: 1 Piece Photosensitive Sensor Module (9 Pack)