Design and Implementation of PV System Tracking by Microcontroller

ABSTRACT This paper presents an automatic dual axis sun tracking system based PIC 16F877A microcontroller which is programmed by flow code. The tracker uses four LDR (Light Dependent Resistor) to sense the position of the sun. Microcontroller order the stepper motor and DC motor to rotate dependent on the voltage difference among the four LDR detectors. The stepper motor moves the PV panel in the horizontal direction from east to west while the DC motor moves the PV in the vertical direction. The practical results show that the overall output energy of tracking PV panel is increased by 20%.