Size: 35*16*1.2mm (excluding component height) Voltage: 5-5.5VDC Current: Less than 1.5A Interface: Power supply + – motor M Principle: Use a shelter on the photosensitive resistance. When the light shines on the shelter to form a shadow, when the photosensitivity on one side forms a difference with that on the other side, control the motor to find the balance point, that is, the center of the light source.