#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int triggerPin = 2;
const int echoPin = 3;
const int LED1 = 4;
const int LED2 = 5;
const int LED3 = 6;
long durasi;


void setup() {
  pinMode(triggerPin, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.backlight();
  lcd.init();
}

void loop() {
  digitalWrite(triggerPin, LOW);
  delay(400);
  digitalWrite(triggerPin, HIGH);
  delay(400);
  digitalWrite(triggerPin, LOW);
  durasi = pulseIn(echoPin, HIGH);
  int cm = durasi*0.0342/2;
  float m = durasi*0.0342/2/100;
  
  if(cm < 100){
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
    lcd.setCursor(0, 0);
    lcd.print("JARAK: ");
    lcd.print(cm);
    lcd.print(" CM     ");
    lcd.setCursor(5, 6);
    lcd.print("BERBAHAYA");
    lcd.setCursor(0, 1);
    lcd.print("KET: ");
  }else 
  if(m > 1 && m < 2){
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, LOW);
    lcd.setCursor(0, 0);
    lcd.print("JARAK: ");
    lcd.print(m);
    lcd.print(" M ");
    lcd.setCursor(5, 6);
    lcd.print("WASPADA  ");
    lcd.setCursor(0, 1);
    lcd.print("KET: ");
  
  }else 
  if(m > 2){
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("JARAK: ");
    lcd.print(m);
    lcd.print(" M ");
    lcd.setCursor(5, 6);
    lcd.print("AMAN     ");
    lcd.setCursor(0, 1);
    lcd.print("KET: ");
  
  }
}