พยายามต่อเซ็นเซอร์เข้ากับบอร์ด arduino UNO ให้มันส่งสัญญานผ่านbuzzer แล้วไม่ได้ผล คือโซน่าร์วัดระยะไม่ค่อยถูกแล้วตัวbuzzerไม่ทำงาน ช่วยแนะนำหน่อยค่ะ

นี่โค้ดค่ะ

// Define pins for ultrasonic and buzzer
int const trigPin = 10;
int const echoPin = 9;
int const buzzPin = 2;
void setup()
{
    Serial.begin(9600);
    pinMode(trigPin, OUTPUT); // trig pin will have pulses output
    pinMode(echoPin, INPUT); // echo pin should be input to get pulse width
    pinMode(buzzPin, OUTPUT); // buzz pin is output to control buzzering
}
void loop()
{
  //ll be the input pulse width and distance will be the distance to the obstacle in centimeters
    int duration, distance;
    // Output pulse with 1ms width on trigPin
    digitalWrite(trigPin, HIGH);
    delay(1);
    digitalWrite(trigPin, LOW);
    // Measure the pulse input in echo pin
    duration = pulseIn(echoPin, HIGH);
    Serial.print("duration ");
    Serial.print(duration);
    Serial.print("\n");

    // Duration wi
    // Distance is half the duration devided by 29.1 (from datasheet)
//    distance = (duration/2) / 29.1;
    distance = (duration*0.034/2);
    Serial.print("distance ");
    Serial.print(distance*100);
    Serial.print("\n");
    // if distance less than 0.5 meter and more than 0 (0 or less means over range)
    if (distance <= 50 && distance >= 0) {
    // Buzz
    digitalWrite(buzzPin, HIGH);
    Serial.print("Shuld beep\n");

    } else {
    // Don't buzz
    digitalWrite(buzzPin, LOW);
    Serial.print("I no beep\n");

    }
    // Waiting 60 ms won't hurt any one
    delay(60);