int trigPin1 = 9; 
int echoPin1 = 10; 

int trigPin2 = 6; 
int echoPin2 = 5; 

const int buzzer1 = 13; 
const int buzzer2 = 12; 

long duration1, duration2;
int distance1, distance2;


void setup() {
  Serial.begin(9600);
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);
  pinMode(buzzer1, OUTPUT);
  pinMode(buzzer2, OUTPUT);
}

void loop() {
  // Measure distance for the first sensor
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = duration1 * 0.034 / 2;

  // Measure distance for the second sensor
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distance2 = duration2 * 0.034 / 2;

  // Check which sensor detects an object first within 50 cm
  if (distance1 < 50) {
    tone(buzzer1, 1000); // First sensor detects
    noTone(buzzer2);
  } else if (distance2 < 50) {
    tone(buzzer2, 1000); // Second sensor detects
    noTone(buzzer1);
  } else {
    noTone(buzzer1);
    noTone(buzzer2); // No sensors detect
  }

  delay(50);
}