solar_tracker1.ino

#include <Servo.h>

Servo sg90;
int initial_position = 90;
int LDR1 = A0;
int LDR2 = A1;
int error = 5;
int servopin = 9;
void setup()
{
  sg90.attach(servopin);
  pinMode(LDR1,INPUT);
  pinMode(LDR2,INPUT);
  sg90.write(initial_position);
  delay(2000);
}

void loop()
{
  int R1 = analogRead(LDR1);
  int R2 = analogRead(LDR2);
  int diff1 = abs(R1 - R2);
  int diff2 = abs(R2 - R1);
  
  if((diff1 <= error) || (diff2 <= error)) {
  } else {
    if(R1 > R2)
    {
      initial_position = --initial_position;
    }
    if(R1 < R2)
    {
      initial_position = ++initial_position;
    }
  }
  sg90.write(initial_position);
  delay(100);
}