Solar Light Source Tracking Module (ARD429)

Main Specifications

• Operating Voltage: 5V – 5.5V DC (regulated required)
• Operating Current: < 1.5A
• Control Type: LDR (light-dependent resistors) differential sensing
• Tracking Type: Single-axis (left/right) or dual-axis (depends on version)
• Sensor Type: 2–4 photoresistors (LDRs)
• Motor Output: DC gear motor driver output (forward/reverse polarity control)
• Board Size: ~35mm × 16mm × 12mm
• Sensor Cable Length: ~15cm
• Response Time: Slow/filtered (prevents jitter in sunlight changes)

How it works

The module compares light levels:

ΔL=Lleft−LrightDelta L = L_{left} - L_{right}ΔL=Lleft​−Lright​

• If left is brighter → motor turns left
• If right is brighter → motor turns right
• Stops when both sides are equal (balanced light)

 Wiring (basic)

• VCC: 5V regulated supply
• GND: Ground
• M+ / M-: DC motor output
• LDR probes: mounted facing different directions (sun sensors)

 Important Notes (very important for this module)

•  Do NOT connect directly to solar panel (voltage fluctuates too much)
•  Must use stable 5V regulator or buck converter
•  Works best with slow geared motor

Typical applications

• Solar panel tracking systems
• DIY Arduino solar projects
• Light-following robots
• Educational electronics kits
• Small automation systems

 Real performance expectation

• Efficiency gain vs fixed panel: ~10% to 25%
• Best improvement happens in morning/evening sun angles