#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

byte sensor = A0;
byte ledMerah = 3;
byte ledKuning = 5;
byte ledHijau = 6;

void setup() {
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);
  lcd.begin(16, 2);
  lcd.print("Value sebesar :");
  delay(1000);
}

void loop() {
  int nilai = analogRead(sensor);
  lcd.setCursor(0, 1);
  lcd.print(nilai);
  lcd.print("      ");
  delay(100);

  if (nilai < 337) {
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledKuning, LOW);
    digitalWrite(ledHijau, HIGH);
  } else if (nilai < 675) {
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledKuning, HIGH);
    digitalWrite(ledHijau, HIGH);
  } else if (nilai < 1023) {
    digitalWrite(ledMerah, HIGH);
    digitalWrite(ledKuning, HIGH);
    digitalWrite(ledHijau, HIGH);
  } else {
    for (int i = 0; i < 2; i++) {
      digitalWrite(ledMerah, LOW);
      digitalWrite(ledKuning, LOW);
      digitalWrite(ledHijau, LOW);
      delay(250);
      digitalWrite(ledMerah, HIGH);
      digitalWrite(ledKuning, HIGH);
      digitalWrite(ledHijau, HIGH);
      delay(250);
    }
  }
}