#define trigPin 26 //pin trig
#define echoPin 27 //pin echo

long waktu; //nilai mentah
int jarak; //hasil jarak

void setup() {
  Serial.begin(9600); //serial monitor
  pinMode(trigPin, OUTPUT); //output
  pinMode(echoPin, INPUT); // input
}

void loop() {
//memancarkan sinyal
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

//menangkap sinyal
waktu = pulseIn(echoPin, HIGH);

//kalkulasi ke satuan cm
jarak= waktu*0.034/2;

//tampil di serial monitor
Serial.print("Jarak: ");
Serial.print(jarak);
Serial.println("cm");
delay(1000);
}