In order to improve the utilization rate of solar energy, a dual-axis solar tracker with complementary control of photoelectric tracking and apparent solar motion trajectory tracking was designed with ATmega8 microcontroller as the control core. On sunny days, the tracker uses photoresistors to collect light intensity to determine the sun\'s position and controls the stepper motor to achieve photoelectric tracking; on cloudy days, it collects time information from the clock device PCF8583 and calculates the current sun\'s position to achieve apparent solar motion trajectory tracking. Experiments show that the solar tracker can track the sun more accurately under different weather conditions, and the energy receiving efficiency is increased by 30%, achieving the purpose of fully utilizing solar energy. Abstract: To improve the utilization rate of solar energy,a kind of solar tracking controller which effectively combined the sun angle tracking and photo electric tracking based on ATmega8 is designed.In the sunny days,the solar tracking con-troller determines the sun\'s position by using photosensitive resistances to collect light intensity and control stepper motors to achieve photo electric tracking,n cloudy days,it collects clock chip PCF8583time information to calculate the current position of the sun and achieve the sun angle tracking.Experimental results show the solar tracking controller accurately tracks the sun in different weather conditions,improves received energy efficiency by30%and reaches the purpose of full use of solar energy.
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