#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
#define triger 5
#define echo 4
const int bajer = 3;
const int ledPin = 13;
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  pinMode(bajer, OUTPUT);
  pinMode(triger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(ledPin, OUTPUT);
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
}


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

  int durasi = pulseIn(echo, HIGH);
  int jarak = durasi * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.print(jarak);
  Serial.println(" cm");

  lcd.setCursor(3, 0);
  lcd.print("Jarak = ");  
  if (jarak < 100) {
     lcd.print(bajer);
    digitalWrite(bajer, HIGH);
    digitalWrite(ledPin, HIGH);
    delay(1000);
  } else {
     lcd.print(bajer);
    digitalWrite(bajer, LOW);
    digitalWrite(ledPin, LOW);
    delay(1000);
  }
                      
}