#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define trigPin 9
#define echoPin 10
#define SDAPin SDA
#define SCLPin SCL

LiquidCrystal_I2C lcd = LiquidCrystal_I2C (0x27,20,4);
long duration;
int distance;

void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
lcd.init();
lcd.backlight();
}

void loop(){
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH); 
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration= pulseIn(echoPin, HIGH);
distance = duration*0.034/2;
lcd.setCursor(0,0); 
lcd.print("Jarak = ");
lcd.print (distance);
lcd.print(" cm ");
delay(50);
}