Specifications: Voltage: 5-5.5V DC Current: less than 1.5A Principle: Use a covering on the photosensitive nozzle, when the light is shining on the obstruction to form a shadow, the light on one side When the difference is formed with the other side, the motor is controlled to find the balance point, that is, the center of the light source. Size: 35x16x12 mm Line length: 15cm Aperture: 3mm Colour: Black material: plastic Note: 1. The power supply uses a 5-5.5V DC power supply with a current of less than 1.5A. 2. The motor uses a geared motor, the slower the better. If the motor speed is too fast, it may cause the motor to align with the center of the light source, but swings left and right, but does not shake. This circuit uses a short delay of anti-shake. 3. When the motor and the board are connected, the positive and negative poles are not divided. If the motor is found to rotate in the opposite direction to the light source during the test, the motor line can be changed. 4. The power supply must be regulated to 5.5-5.5V and cannot be directly connected to the solar panel. Package Included: 4 x Light Source Tracking Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.