Sun Tracking Solar Panel using an Arduino

Sun Tracking Solar Panel Using Arduino – DIY Project

In the era of sustainable energy, solar power stands out as a clean and renewable source of electricity. However, traditional fixed solar panels are not always efficient, as they cannot follow the movement of the sun throughout the day. To overcome this limitation and enhance energy generation, a sun-tracking solar panel system can be built using an Arduino. This DIY project from Techatronic demonstrates how to create a simple, low-cost dual-axis solar tracker that automatically aligns itself toward the sun using light sensors and servo motors.

What Is a Sun Tracking Solar Panel?

A sun-tracking solar panel system is designed to follow the sun’s path across the sky. By adjusting its position in real time, it ensures that the solar panel receives maximum sunlight from sunrise to sunset. This increases the panel's energy output by up to 25–40%, depending on the accuracy of the tracking system. The project discussed here uses Arduino Uno, LDRs (Light Dependent Resistors), and servo motors to achieve this goal.

Components Required

To build this system, you’ll need the following components:

Arduino Uno board

• Arduino Uno board

4 x LDR sensors

• 4 x LDR sensors

4 x 10k ohm resistors

• 4 x 10k ohm resistors

2 x SG90 servo motors

• 2 x SG90 servo motors

Solar panel (for demonstration)

• Solar panel (for demonstration)

Breadboard and jumper wires

• Breadboard and jumper wires

Cardboard or acrylic sheet for mounting

• Cardboard or acrylic sheet for mounting

Working Principle

The system uses four LDRs positioned at the corners of the solar panel—top-left, top-right, bottom-left, and bottom-right. These sensors measure the intensity of light falling on them. The Arduino compares the readings of the LDRs to determine the direction in which sunlight is strongest.

If the top sensors receive more light than the bottom ones, the vertical servo moves the panel upwards. If the left sensors detect more light than the right, the horizontal servo rotates the panel accordingly. This continuous comparison and adjustment ensure that the panel is always facing the brightest direction—i.e., directly at the sun.

Code and Circuit Design

The Arduino code reads analog values from the four LDRs and calculates the difference between the left-right and top-bottom pairs. Based on a predefined threshold, the code decides whether to move the servo motors. A small delay is added to avoid excessive movement and reduce power consumption. The servo motors are connected to digital pins (typically D9 and D10), and the LDRs are connected to analog input pins (A0–A3).

The circuit is simple and can be built on a breadboard. Proper alignment of the LDRs is crucial for accurate tracking. The panel and LDRs are mounted on a platform controlled by two axes using servo motors.

Advantages of the Project

Increases solar panel efficiency

• Increases solar panel efficiency

Easy to build using affordable components

• Easy to build using affordable components

Great for educational and DIY purposes

• Great for educational and DIY purposes

Enhances understanding of sensors, servos, and Arduino programming

• Enhances understanding of sensors, servos, and Arduino programming

Conclusion

This Arduino-based sun-tracking solar panel project is a practical introduction to automation and renewable energy systems. With basic components and programming, you can create a functional dual-axis solar tracker that intelligently follows the sun throughout the day. It's a valuable project for students, hobbyists, and anyone interested in energy-efficient technologies.