// LDR analog inputs
#define LDR_TL A0
#define LDR_TR A1
#define LDR_BL A2
#define LDR_BR A3

// Motor X (horizontal)
#define DIR_X 2
#define STEP_X 3

// Motor Y (vertical)
#define DIR_Y 4
#define STEP_Y 5

// Motor movement config
int stepDelay = 700;      // Delay between steps (microseconds)
int threshold = 100;      // Light difference threshold

void setup() {
  pinMode(DIR_X, OUTPUT);
  pinMode(STEP_X, OUTPUT);
  pinMode(DIR_Y, OUTPUT);
  pinMode(STEP_Y, OUTPUT);

  Serial.begin(9600); // Optional: for debugging
}

void loop() {
  int tl = analogRead(LDR_TL);
  int tr = analogRead(LDR_TR);
  int bl = analogRead(LDR_BL);
  int br = analogRead(LDR_BR);

  int avgTop = (tl + tr) / 2;
  int avgBottom = (bl + br) / 2;
  int avgLeft = (tl + bl) / 2;
  int avgRight = (tr + br) / 2;

  // Horizontal (X-axis) movement
  int diffX = avgLeft - avgRight;
  if (abs(diffX) > threshold) {
    digitalWrite(DIR_X, diffX > 0 ? HIGH : LOW); // Turn motor
    stepMotor(STEP_X);
  }

  // Vertical (Y-axis) movement
  int diffY = avgTop - avgBottom;
  if (abs(diffY) > threshold) {
    digitalWrite(DIR_Y, diffY > 0 ? HIGH : LOW); // Tilt motor
    stepMotor(STEP_Y);
  }

  delay(200); // Wait a bit before next read
}

void stepMotor(int stepPin) {
  digitalWrite(stepPin, HIGH);
  delayMicroseconds(stepDelay);
  digitalWrite(stepPin, LOW);
  delayMicroseconds(stepDelay);
}