🌞 Dual-Axis Arduino Solar Tracker

A more accurate dual-axis solar tracker using 4 LDRs and 2 servo motors to follow the sun throughout the day (left–right and up–down).

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🧰 Components

• Arduino Uno
• 4x LDRs
• 4x 10kΩ resistors
• 2x Servo motors (SG90 or MG996R)
• Breadboard & jumper wires
• Mount structure (cardboard, 3D printed, or wood)

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⚙️ Pin Connections

Component	Arduino Pin
LDR Top Left	A0
LDR Top Right	A1
LDR Bottom Left	A2
LDR Bottom Right	A3
Servo (Azimuth)	D9
Servo (Elevation)	D10

• Each LDR is connected in a voltage divider with a 10kΩ resistor.
• Servo motors are powered from 5V (external supply recommended for MG996R).
• Ground all components to Arduino GND.

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📐 How It Works

The tracker compares light values:

• Left vs Right → Horizontal movement (East–West)
• Top vs Bottom → Vertical movement (Elevation)

Servos adjust panel orientation based on which side receives more light.

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🖼️ Circuit Diagram

📌 Recommended layout:

TL  ---- TR
  \    /
   [ Solar Panel ]
  /    \
BL  ---- BR

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📜 Arduino Code

See solar_tracker_dual_axis.ino

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🚀 Future Improvements

• Add GPS or RTC for time-based solar angles
• Data logging (SD card or cloud)
• Solar-powered version
• Automatic reset at night

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🧪 Test Tips

• Use a flashlight to simulate sun movement
• Test servos separately before full assembly
• Make sure LDRs are equally spaced and aligned

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📄 License

MIT License – Free to use, modify, and share