In this paper, in order to maximize the utilization of solar panels, I designed a photoelectric tracking mode of automatic sun following controller. This design takes STC89C52 single chip microcomputer as the core control element, the main principle is to compare the change of the resistance value of the photosensitive resistance, and then transmit the input voltage signal to two ADC0832 chips, and analyze and process the data through STC89C52 single chip microcomputer, and then output the output signal to uln2003a, so as to control the four phase stepping motor to automatically follow the sun. The system has the advantages of low price, wide range and high precision tracking, and can greatly improve the utilization of solar energy.<br>
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