#include <LiquidCrystal_I2C.h> // library lcd i2c
#include <Wire.h>

LiquidCrytal_I2C lcd(0x27, 16. 2); //alamat lcd 12c
const int trigPin = 9; 
const int echoPin = 8;
int LED = 2;

long waktu;
int jarak;

void setup() {
  // put your setup code here, to run once:
pinMode (trigPin, OUTPUT);
pinMode (trigPin, INPUT);
Serial.begin (9600);
lcd.begin(16,2);//deklarasi baris dan kolom lcd i2c
lcd.init(); //inisialisasi dari lcd i2c
lcd.backlight (); //untuk menyalakan lcd i2c
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

waktu = pulseIn(echoPin, HIGH);
jarak = waktu/58.8;
delay(1000);

Serial.print ("jarak :");
Serial.print (jarak);
Serial.print ("CM");
Serial.println();

lcd.print("jarak :");
lcd.print(jarak);
lcd.print(" cm");

if (jarak < 10)
{
  digitalWrite(LED, HIGH);
  lcd.setCursor(0,0);
  lcd.print("jarak :");
  lcd.print(jarak);
  lcd.print(" cm");
  
}
else
{
  digitalWrite(LED, LOW);
}
}