Smart School Bus ( Window accident prevention bus )

#define trigPin1 9

#define echoPin1 10

#define trigPin2 11

#define echoPin2 12

#define buzzer1 6

#define buzzer2 7

long duration1, distance1;

long duration2, distance2;

const int distanceThreshold = 20; // distance threshold in centimeters

void setup() {

  pinMode(trigPin1, OUTPUT);

  pinMode(echoPin1, INPUT);

  pinMode(trigPin2, OUTPUT);

  pinMode(echoPin2, INPUT);

  pinMode(buzzer1, OUTPUT);

  pinMode(buzzer2, OUTPUT);

  Serial.begin(9600);

}

void loop() {

  // Read first ultrasonic sensor

  digitalWrite(trigPin1, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin1, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin1, LOW);

  duration1 = pulseIn(echoPin1, HIGH);

  distance1 = (duration1 / 2) / 29.1; // Convert duration to distance

  // Read second ultrasonic sensor

  digitalWrite(trigPin2, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin2, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin2, LOW);

  duration2 = pulseIn(echoPin2, HIGH);

  distance2 = (duration2 / 2) / 29.1; // Convert duration to distance

  // Check if any sensor detected an object within the threshold distance

  if (distance1 < distanceThreshold) {

    digitalWrite(buzzer1, HIGH); // Turn on buzzer 1

    Serial.println("Window 1 detected an object.");

  } else {

    digitalWrite(buzzer1, LOW); // Turn off buzzer 1

  }

  if (distance2 < distanceThreshold) {

    digitalWrite(buzzer2, HIGH); // Turn on buzzer 2

    Serial.println("Window 2 detected an object.");

  } else {

    digitalWrite(buzzer2, LOW); // Turn off buzzer 2

  }

  delay(100); // Short delay to avoid spamming the serial monitor

}