int LED1 = 4;
int LED2 = 3;
int LED3 = 2;
int Trig = 6;
int Echo = 7;
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

long durasi, jarak;

void setup() {
  Serial.begin(9600);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(Trig, OUTPUT);
  pinMode(Echo, INPUT);
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
}

void loop(){
  digitalWrite(Trig, LOW);
  delayMicroseconds(8);
  digitalWrite(Trig, HIGH);
  delayMicroseconds(8);
  digitalWrite(Trig, LOW);
  delayMicroseconds(8);
  durasi = pulseIn(Echo, HIGH);
  jarak = (durasi / 2) / 29,1-2;
  if (jarak >=200){
    digitalWrite (LED3, HIGH);
    digitalWrite (LED2, LOW);
    digitalWrite (LED1, LOW);
    lcd.setCursor(0,0);
    lcd.print("Jarak : ");
    lcd.print(jarak);
    lcd.print(" cm");
    lcd.setCursor(0,1);
    lcd.print("Status : ");
    lcd.print("AMAN   ");
    } 
    else if ( (jarak > 100)&&(jarak <200) ){
    digitalWrite (LED3, LOW);
    digitalWrite (LED2, HIGH);
    digitalWrite (LED1, LOW);
    lcd.setCursor(0,0);
    lcd.print("Jarak : ");
    lcd.print(jarak);
    lcd.setCursor(12,0);
    lcd.print("cm ");
    lcd.setCursor(0,1);
    lcd.print("Status ; ");
    lcd.print("WASPADA ");}
    else {
      digitalWrite (LED3, LOW);
      digitalWrite (LED2, LOW);
      digitalWrite (LED1, HIGH);
      lcd.setCursor(0,0);
      lcd.print("Jarak : ");
      lcd.print(jarak);
      lcd.print(" cm  ");
      lcd.setCursor(0,1);
      lcd.print("Status ; ");
      lcd.print("BAHAYA ");
    }
}