// Include the servo motor library
#include <Servo.h>

// Define the LDR sensor pins in the Analog pins
#define LDR1 A0
#define LDR2 A1

// Servo:
Servo turner; // Create an object for the servo motor
#define error 10 // Define the error value. This eliminates unnecessary movements
int Spoint =  90; // Starting point of the servo motor

void setup() {
  // Include servo motor PWM pin
  turner.attach(12);

  // Set the starting point of the servo
  turner.write(Spoint);
}

void loop() {
  // Get the LDR sensor values
  int ldr1 = analogRead(LDR1);
  int ldr2 = analogRead(LDR2);

  // Get the difference of these values
  int errorCheck = abs(ldr1 - ldr2);

  if (errorCheck > error) {    
    if (ldr1 > ldr2) {
      Spoint = Spoint + 1; // LDR 1 is receiving more light
    }
    else if (ldr1 < ldr2) {
      Spoint = Spoint - 1; // LDR 2 is receiving more light
    }  
  }

  // Write values on the servo motor
  turner.write(Spoint);
  delay(80);
}