Advanced VLSI Design Analog Electronics Digital Design Innovative Microcontroller Based Projects

Solar Panel Direction Control System According to the Sun Direction


Solar energy systems have emerged as a viable source of renewable energy over the past two or three decades, and are now widely used for a variety of industrial and domestic applications. Such systems are based on a solar collector, designed to collect the sun’s energy and to convert it into either electrical power or thermal energy. In general, the power developed in such applications depends fundamentally upon the amount of solar energy captured by the collector, and thus the problem of developing tracking schemes capable of following the trajectory of the sun throughout the course of the day on a year-round basis has received significant coverage in this project. In Aden city (Yemen), the improvement in the performance of a solar cooker during summer was found to be as much as 40% for higher elevation angle and 70% for lower elevation angle, based on the developed tracking algorithms. Moreover, it was shown that the amount of solar energy captured by a tilted collector could be increased by more than 40% by adjusting the tilt angle on a seasonal basis.

This project is designed with AT89S52 MCU.  Solar panel output is interfaced to Microcontroller through ADC. The controller continuously checks the voltage level of the panel and operates the stepper motor to attain maximum voltage. An LDR is used to sense the day / night condition, to disable the tracking in night condition. The stepper motor is driven by a ULN driver.

This project uses regulated 12V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.

Block diagram


  1. Highly sensitive
  2. Works according to the sun direction
  3. Fit and Forget system
  4. Night – Day mode sensing
  5. Low cost and reliable circuit
  6. Complete elimination of manpower


  1. Street lights
  2. Garden Lights
  3. Solar water heater
  4. Hotels, hostels and house hold applications
  5. Offices
  6. Industries








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