#define <musicTones.h>
const int trigPin = 9;
const int echoPin = 10;
const int buzzer = 11;
const int ledPin = 13;

const int trigPin2 = 4;
const int echoPin2 = 3;
const int buzzer2 = 5;
const int ledPin2 = 2;

long duration;
int distance;
int safetyDistance;

void setup() {
pinMode(trigPin, OUTPUT); 
pinMode(echoPin, INPUT);
pinMode(buzzer, OUTPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600);

pinMode(trigPin2, OUTPUT); 
pinMode(echoPin2, INPUT); 
pinMode(buzzer2, OUTPUT);
pinMode(ledPin2, OUTPUT);
Serial.begin(9600);
}

void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance= duration*0.034/2;
safetyDistance = distance;

digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin2, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin2, LOW);
duration = pulseIn(echoPin2, HIGH);
distance= duration*0.034/2;
safetyDistance = distance;

delay (100);
if (safetyDistance <= 10){
  digitalWrite(buzzer, HIGH);
  digitalWrite(ledPin, HIGH);
  digitalWrite(buzzer2, HIGH);
  digitalWrite(ledPin2, HIGH);
  tone(buzzer, 1000,500);
}
else{
  digitalWrite(buzzer, LOW);
  digitalWrite(ledPin, LOW);
  digitalWrite(buzzer2, LOW);
  digitalWrite(ledPin2, LOW);
}

Serial.print("Distance: ");
Serial.println(distance);
}