#define TRIG_PIN_1 9
#define ECHO_PIN_1 10
#define TRIG_PIN_2 11
#define ECHO_PIN_2 12

void setup() {
    // Start serial communication
    Serial.begin(9600);

    // Set the TRIG and ECHO pins as INPUT or OUTPUT
    pinMode(9, OUTPUT);
    pinMode(10, INPUT);
    pinMode(11, OUTPUT);
    pinMode(12, INPUT);
}

void loop() {
    long distance1 = measureDistance(9, 10);
    long distance2 = measureDistance(11, 12);

    // Print distances to Serial Monitor
    Serial.print("Bin 1 Level: ");
    Serial.print(distance1);
    Serial.println(" cm");

    Serial.print("Bin 2 Level: ");
    Serial.print(distance2);
    Serial.println(" cm");

    // Wait for 1 second before the next measurement
    delay(1000);
}

long measureDistance(int trigPin, int echoPin) {
    long duration, distance;

    // Clear the TRIG pin
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);

    // Set the TRIG pin HIGH for 10 microseconds
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);

    // Read the ECHO pin, returns the sound wave travel time in microseconds
    duration = pulseIn(echoPin, HIGH);

    // Calculate the distance (duration/2) * speed of sound (0.034 cm/µs)
    distance = (duration * 0.034) / 2;

    return distance;
}