#define GREEN_LED_PIN 6
#define YELLOW_LED_PIN 7
#define LEFT_CAR_BUTTON 8
#define RIGHT_CAR_BUTTON 9

const int DISTANCE_THRESHOLD = 100; // Distance in cm to trigger detection
const int DELAY_TIME = 1000; // Delay between readings in milliseconds

int leftCarDistance = 500;  // Start with car far away
int rightCarDistance = 500; // Start with car far away

void setup() {
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(YELLOW_LED_PIN, OUTPUT);
  pinMode(LEFT_CAR_BUTTON, INPUT_PULLUP);
  pinMode(RIGHT_CAR_BUTTON, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  // Simulate left car movement
  if (digitalRead(LEFT_CAR_BUTTON) == LOW) {
    leftCarDistance = max(0, leftCarDistance - 50);  // Move car closer faster
  } else {
    leftCarDistance = min(500, leftCarDistance + 10);  // Move car away slowly
  }

  // Simulate right car movement
  if (digitalRead(RIGHT_CAR_BUTTON) == LOW) {
    rightCarDistance = max(0, rightCarDistance - 50);  // Move car closer faster
  } else {
    rightCarDistance = min(500, rightCarDistance + 10);  // Move car away slowly
  }

  bool leftDetected = leftCarDistance < DISTANCE_THRESHOLD;
  bool rightDetected = rightCarDistance < DISTANCE_THRESHOLD;
  
  if (leftDetected && rightDetected) {
    digitalWrite(GREEN_LED_PIN, LOW);
    digitalWrite(YELLOW_LED_PIN, HIGH);
    Serial.println("Yellow: Cars detected on both sides");
  } else if (leftDetected || rightDetected) {
    digitalWrite(GREEN_LED_PIN, HIGH);
    digitalWrite(YELLOW_LED_PIN, LOW);
    Serial.println("Green: Car detected on one side");
  } else {
    digitalWrite(GREEN_LED_PIN, LOW);
    digitalWrite(YELLOW_LED_PIN, LOW);
    Serial.println("Off: No cars detected");
  }
  
  Serial.print("Left car distance: ");
  Serial.print(leftCarDistance);
  Serial.print(" cm, Right car distance: ");
  Serial.print(rightCarDistance);
  Serial.println(" cm");
  
  delay(DELAY_TIME);
}