Abstract
In order to reduce the tracking accuracy of stepping motor caused by step loss, this paper designs a day by day system using fuzzy PID control strategy. The system uses STM32 as the micro controller and the MPU6050 serial module as the angle feedback element and the four quadrant detector as the solar position sensor. The tracking mode is combined with the optic tracking and the photoelectric tracking. By controlling the PWM output to drive the step motor in two directions in the horizontal and the pitching direction, the full position of the sun is tracked. The experiment shows that the fuzzy PID control system has higher tracking accuracy and stability than the classical PID control and the deviation control. The error in the horizontal direction is 0.1 degree ∼0.2, and the direction of the pitching is about 0.1 degrees.
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