This solar tracker control system is designed to take light measurements from the east and west (left and right) side of the solar panel and determine which way to move the panel to point it directly at the source of the light. A servo is used to actuate the panel tracker; these are available in a broad range of sizes and can be scaled according to your panel size. Although this tracker is single axis, the two sensors and servo can simply be duplicated to provide dual axis control.


  • Arduino + Breadboard + USB Cable
  • Servo motor
  • 470uF capacitor (optional)
  • LDR x2
  • 4.7 kOhm resistor x2
  • Jumper wires