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AgriSun Solar Tracker is an Arduino-based intelligent solar irrigation system designed to address unreliable electricity, inefficient irrigation, water scarcity, and food security challenges. The system integrates dual-axis solar tracking, LDR sensors, Arduino Uno, a servo motor, relay module, rechargeable battery, and an automated water pump to maximize solar energy utilization and optimize irrigation. Operating independently of the electrical grid, it reduces water and energy consumption while improving irrigation reliability and crop productivity. Its affordable, portable, and scalable design supports sustainable agriculture, renewable energy adoption, and rural farming communities. The project also offers educational value and future potential for AI-powered smart farming integration.