#include <Servo.h>      //including the library of servo motor
Servo myservo;
int initial_position = 90;
int LDR1 = A0;          //connect The LDR1 on Pin A0
int LDR2 = A1;          //Connect The LDR2 on pin A1
int error = 5;
int servopin=11;        //You can change servo just makesure its on arduino's PWM pin
void setup()
{


  myservo.attach(servopin);
  pinMode(LDR1, INPUT);
  pinMode(LDR2, INPUT);
  myservo.write(initial_position);   //Move servo at 90 degree
  delay(2000);
}

void loop()
{
  int R1 = analogRead(LDR1); // read  LDR 1
  int R2 = analogRead(LDR2); // read  LDR 2
  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;
    }
  }
  myservo.write(initial_position);
  delay(100);
}