const int redLight = 2;
const int yellowLight = 3;
const int greenLight = 4;
const int pedestrianLight = 5;
const int buttonPin = 6;
const int buzzerPin = 7;
const int trigPin = 8;
const int echoPin = 9;

long duration;
int distance;

void setup() {
  pinMode(redLight, OUTPUT);
  pinMode(yellowLight, OUTPUT);
  pinMode(greenLight, OUTPUT);
  pinMode(pedestrianLight, OUTPUT);
  pinMode(buttonPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(buttonPin) == HIGH) {
    // Pedestrian crossing activated
    digitalWrite(pedestrianLight, HIGH);
    digitalWrite(redLight, HIGH);
    digitalWrite(yellowLight, LOW);
    digitalWrite(greenLight, LOW);
    delay(5000);  
    digitalWrite(pedestrianLight, LOW);
    digitalWrite(redLight, LOW);
  }

  digitalWrite(greenLight, HIGH);
  digitalWrite(yellowLight, LOW);
  digitalWrite(redLight, LOW);
  delay(5000); 
  
  digitalWrite(greenLight, LOW);
  digitalWrite(yellowLight, HIGH);
  delay(2000); 
  
  digitalWrite(yellowLight, LOW);
  digitalWrite(redLight, HIGH);
  delay(5000);  
 
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;  
  
  if (distance <= 10 && digitalRead(pedestrianLight) == HIGH) {
    tone(buzzerPin, 1000);  
  } else {
    noTone(buzzerPin); 
  }
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  Serial.print("Traffic Light: ");
  if (digitalRead(redLight) == HIGH) {
    Serial.println("Red");
  } else if (digitalRead(yellowLight) == HIGH) {
    Serial.println("Yellow");
  } else if (digitalRead(greenLight) == HIGH) {
    Serial.println("Green");
  }
  
  Serial.print("Pedestrian Light: ");
  if (digitalRead(pedestrianLight) == HIGH) {
    Serial.println("ON");
  } else {
    Serial.println("OFF");
  }
  
  delay(1000);
}