Dual axis solar tracker with Arduino

In this tutorial you learn how to make a solar tracker with Arduino, Which tracks movement of sun or light. This solar tracker increase efficiency of conversion of energy by 30- 40 % .

Components and software Required —

• Arduino IDE
• 4 pieces – LDR
• 2 Servo motor
• Dual axis chassis
• Arduino UNO
• jumper wires
• A small solar panel

Assemble dual axis chassis

Screw Servo axis with this chassis

Attach both parts and final attachment look like this.

Connect According to this circuit diagram

Attach all four LDR at Four side of Solar panel

Install Arduino IDE Click on this link —https://www.arduino.cc/en/donate/

Click on just download

Install SERVO Library

click on tools >> manage libraries.

Search Servo and Click on install

Create new file Add this Code to your Arduino IDE

#include <Servo.h>
Servo servo1;
Servo servo2;

int LDR1 = A1;
int LDR2 = A2;
int LDR3 = A4;
int LDR4 = A3;
int error1 =0;
int error2 =0;
int LDRLeft = 0;
int LDRRight = 0;
int LDRTOP = 0;
int LDRBOTTOM = 0;
int ServoPos1 = 0;
int ServoPos2 = 0;


void setup() {
  // put your setup code here, to run once:
  
Serial.begin(9600);
servo1.attach(11);
servo2.attach(10);

}

void loop() {
   // while(!Serial.available());
    //val=Serial.read();
    LDRLeft = analogRead(LDR1);
    LDRRight = analogRead(LDR2);
     LDRTOP = analogRead(LDR3);
    LDRBOTTOM = analogRead(LDR4);

  error1 = LDRLeft - LDRRight;          //Determine the difference between the two sensors.
  if(error1>60)        //If the error1 is positive and greater than 15 then move the servo1 in the east direction
  {
    if(ServoPos1<=100)  //Check that the servo1 is not at the end of its limit in the east direction
    {
      ServoPos1++;
      servo1.write(ServoPos1);  //Move the servo1 to the east
    }
  }
  else if(error1<-40)  //If the error1 is negative and less than -15 then move the servo1 in the west direction
  {
    if(ServoPos1>20)  //Check that the servo1 is not at the end of its limit in the west direction
    {
      ServoPos1--;
      servo1.write(ServoPos1);  //Move the servo1 to the west
    }
  }


error2 = LDRTOP - LDRBOTTOM;          //Determine the difference between the two sensors.
  if(error2>80)        //If the error1 is positive and greater than 15 then move the servo1 in the east direction
  {
    if(ServoPos2<=160)  //Check that the servo1 is not at the end of its limit in the east direction
    {
      ServoPos2++;
      servo2.write(ServoPos2);  //Move the servo1 to the east
    }
  }
  else if(error2<-80)  //If the error1 is negative and less than -15 then move the servo1 in the west direction
  {
    if(ServoPos2>20)  //Check that the servo1 is not at the end of its limit in the west direction
    {
      ServoPos2--;
      servo2.write(ServoPos2);  //Move the servo1 to the west
    }
  }
 
    
//Serial.println("Left");
//Serial.println(LDRLeft);

Serial.println("difference");

Serial.println(LDR2);

 

}