#include <Servo.h>

Servo servo1;
Servo servo2;

int LDR1;
int LDR2;
int LDR3;
int LDR4;
int offset1 = 0;
int offset2 = 0;
int val1 = 90;
int val2 = 90;

void setup() {
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  pinMode(A2, INPUT);
  pinMode(A3, INPUT);

  servo1.attach(9);
  servo2.attach(10);
  servo1.write(90);
  servo2.write(90);
  Serial.begin(9600);
  delay(1000);
}

void loop() {
  LDR1 = analogRead(A0) + offset1;
  LDR2 = analogRead(A1);
  LDR3 = analogRead(A2);
  LDR4 = analogRead(A3) + offset2;

  Serial.print("LDR1: ");
  Serial.print(LDR1);
  Serial.print(" LDR2: ");
  Serial.print(LDR2);
  Serial.print(" LDR3: ");
  Serial.print(LDR3);
  Serial.print(" LDR4: ");
  Serial.print(LDR4);
  Serial.print(" val1: ");
  Serial.print(val1);
  Serial.print(" val2: ");
  Serial.println(val2);

  if ((LDR2 > LDR4) && (val1 > 0 && val1 < 175)){
    val1 = val1 + 1;
    servo1.write(val1);
  }

  if ((LDR2 < LDR4) && (val1 > 0 && val1 < 175)){
    val1 = val1 - 1;
    servo1.write(val1);
  }

    if ((LDR1 < LDR3) && (val2 > 0 && val2 < 180)){
    val2 = val2 + 1;
    servo2.write(val2);
  }

  if ((LDR1 > LDR3) && (val2 > 0 && val2 < 180)){
    val2 = val2 - 1;
    servo2.write(val2);
  }

  delay(100);
}