// Define Pins for 3 Sensors
const int trigPin1 = 3, echoPin1 = 2;
const int trigPin2 = 5, echoPin2 = 4;
const int trigPin3 = 7, echoPin3 = 6;

long duration;
int distance1, distance2, distance3;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin1, OUTPUT); pinMode(echoPin1, INPUT);
  pinMode(trigPin2, OUTPUT); pinMode(echoPin2, INPUT);
  pinMode(trigPin3, OUTPUT); pinMode(echoPin3, INPUT);
}

void loop() {
  // Read Sensor 1
  distance1 = getDistance(trigPin1, echoPin1);
  // Read Sensor 2
  distance2 = getDistance(trigPin2, echoPin2);
  // Read Sensor 3
  distance3 = getDistance(trigPin3, echoPin3);

  // Print Results
  Serial.print("S1: "); Serial.print(distance1); Serial.print("cm | ");
  Serial.print("S2: "); Serial.print(distance2); Serial.print("cm | ");
  Serial.print("S3: "); Serial.print(distance3); Serial.println("cm");
  
  delay(100); // Small delay for stability
}

// Function to calculate distance
int getDistance(int trigPin, int echoPin) {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  // Speed of sound is 340 m/s, or 0.034 cm/us
  return duration * 0.034 / 2;
}