// Define pin numbers for LEDs
const int led1Pin = 2;
const int led2Pin = 3;
const int led3Pin = 4;
const int led4Pin = 5;

// Define analog input pins for EOG signals
const int eogLeftPin = A0;
const int eogRightPin = A1;

// Threshold values to determine eye movement direction
const int threshold = 512;

void setup() {
  // Initialize LED pins as outputs
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin, OUTPUT);

  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the EOG signal values
  int eogLeft = analogRead(eogLeftPin);
  int eogRight = analogRead(eogRightPin);

  // Debugging: Print EOG values
  Serial.print("Left Eye: ");
  Serial.print(eogLeft);
  Serial.print("\tRight Eye: ");
  Serial.println(eogRight);

  // Control LEDs based on eye movement
  if (eogLeft > threshold && eogRight <= threshold) {
    digitalWrite(led1Pin, HIGH); // Left eye movement - LED1 on
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, LOW);
    digitalWrite(led4Pin, LOW);
  } else if (eogRight > threshold && eogLeft <= threshold) {
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, HIGH); // Right eye movement - LED2 on
    digitalWrite(led3Pin, LOW);
    digitalWrite(led4Pin, LOW);
  } else if (eogLeft > threshold && eogRight > threshold) {
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, HIGH); // Both eyes movement - LED3 on
    digitalWrite(led4Pin, LOW);
  } else {
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, LOW);
    digitalWrite(led4Pin, HIGH); // No eye movement - LED4 on
  }

  delay(100);
}