//Nama: Reza Rafli Fahlendi
//NPM: 2215061049
//Kelas:PSTI A
#define trigPin 9 
#define echoPin 10 
#define buzzer 8
void setup() { 
  Serial.begin(9600); 
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  pinMode(buzzer, OUTPUT);
  } 
  void loop() { 
    long duration, distance; 
    digitalWrite(trigPin, LOW); 
    delayMicroseconds(2); 
    digitalWrite(trigPin, HIGH); 
    delayMicroseconds(10); 
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH); 
    distance = (duration * 0.034) / 2; 
    if(distance >= 350){
      tone(buzzer, 100);
    } else{
      tone(buzzer, LOW);
    }
    Serial.print("Jarak: "); 
    Serial.print(distance); 
    Serial.println(" cm");
    delay(1000); 
    }