// Include the servo motor library
#include <ESP32Servo.h>

// Define the LDR sensor pins in the Analog pins
#define LDR1 15
#define LDR2 2

// Define the error value. This eliminates unnecessary movements
#define error 10

// Starting point of the servo motor
int Spoint =  90;

// Create an object for the servo motor
Servo turner;

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

  // Set the starting point of the servo
  turner.write(Spoint);
  delay(100);
}

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

  // Get the difference of these values
  int errorCheck_1 = abs(ldr1 - ldr2);
  int errorCheck_2 = abs(ldr2 - ldr1);

  if ((errorCheck_1 <= error) || (errorCheck_2 <= error)) {
    // They've become equal, hence, stay central
    if (ldr1 = ldr2) {
      Spoint = 90;
    }

    // No significant change, do nothing
  } else {
    if (ldr1 > ldr2) {
      Spoint = Spoint + 1;
    }
    else if (ldr1 < ldr2) {
      Spoint = Spoint - 1;
    }  
  }

// Write values on the servo motor
  turner.write(Spoint);
  delay(50);
}