const int LampuMerah = 1;
const int LampuKuning = 2;
const int LampuHijau = 3;
#include <LiquidCrystal.h>
#include "DHT.h"
#define DHTPIN 4
LiquidCrystal lcd(7,8,9,10,11,12);
#define DHTTYPE DHT22
DHT dht(DHTPIN,DHTTYPE);

void setup() {
  dht.begin();
  pinMode(LampuMerah, OUTPUT);
  pinMode(LampuKuning, OUTPUT);
  pinMode(LampuHijau, OUTPUT);
  lcd.begin(16,2);
  lcd.print("Lampu LaluLintas");
  delay(2000);
  lcd.clear();
}

void loop() {
  float t = dht.readTemperature();
  if(isnan(t)){
    lcd.setCursor(0,0);
    lcd.print("DHT22 Error");
  } else {
    // ----- Lampu Merah -----
    digitalWrite(LampuMerah, HIGH); 
    ShowMessage("Tolong Berhenti", t, 715);
    digitalWrite(LampuMerah, LOW);

    // ----- Lampu Kuning -----
    digitalWrite(LampuKuning, HIGH);
    ShowMessage("Hati Hati", t, 150);
    digitalWrite(LampuKuning, LOW);

    // ----- Lampu Hijau -----
    digitalWrite(LampuHijau, HIGH);
    ShowMessage("Selamat Jalan", t, 715);
    digitalWrite(LampuHijau, LOW);
  }
}

void DisplayTemp(float t) {
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print("C ");
  
  // Menentukan cuaca berdasarkan suhu
  if(t < 20) {
    lcd.print("Dingin");
  } else if(t >= 20 && t <= 30) {
    lcd.print("Normal");
  } else {
    lcd.print("Panas");
  }
}

void ShowMessage(String text, float t, int delayScroll) {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(text);
  lcd.setCursor(0,1);
  DisplayTemp(t);
  for(int PositionCounter = 1; PositionCounter < 15; PositionCounter++){
    lcd.scrollDisplayLeft();
    delay(delayScroll);
  }
}