const int echoPin = 11; 
const int trigPin = 12; 

long duration; 
long distance; 

void setup() { 
Serial.begin (9600); 
pinMode(echoPin, INPUT); 
pinMode(trigPin,OUTPUT); 
} 

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

duration = pulseIn(echoPin, HIGH); 

distance = duration* 0.034/2;

Serial.print("Jarak");
Serial.print(distance); 
Serial.println(" cm"); 
delay(1000);
}