#include <Ultrasonic.h>
Ultrasonic ultrasonic(12, 13);  // Trigger pin = 12, Echo pin = 13

void setup() {
  pinMode(8, OUTPUT);  // Red light
  pinMode(9, OUTPUT);  // Green light
  Serial.begin(9600);  // Optional: Start the Serial monitor for debugging
}

void loop() {
  int distance = ultrasonic.read();  // Read distance from ultrasonic sensor
  
  // Debugging: Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.println(distance);

  // Control lights based on distance
  if (distance < 50) {
    digitalWrite(8, HIGH);  // Turn on red light for emergency vehicle
    digitalWrite(9, LOW);   // Turn off green light
  } else {
    digitalWrite(9, HIGH);  // Normal green light
    digitalWrite(8, LOW);   // Turn off red light
  }

  delay(200);  // Small delay to stabilize the sensor reading and avoid flickering
}