This system design uses 4 phototransistors (3DU33), two stepper motors, TI\'s M3 (RAM), etc. to build the system framework. The 32-bit processor of M3 is the main controller. The 4 phototransistors are used to track the point with the strongest sensitivity to the 1W LED white light. As the given light source moves, the 4 phototransistors on the stepper motor bracket track the points with the strongest sensitivity to different light as the light moves. By controlling the current flowing through the LED, different light intensities of the LED are obtained. The corresponding phototransistors also track the point with the strongest sensitivity to the LED white light.
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