#include <LiquidCrystal_I2C.h>
#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT22
#define LEDPIN 3

DHT dht(DHTPIN,DHTTYPE);
LiquidCrystal_I2C lcd(0x27,20,4);

int chk;
float humidity;
float temperature;

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  lcd.init();
  lcd.backlight();
  
  pinMode(LEDPIN, OUTPUT);

  lcd.setCursor(3,0);
  lcd.print("Papan Informasi");
  lcd.setCursor(2,1);
  lcd.print("Suhu & Kelembatan");
  lcd.setCursor(8,2);
  lcd.print("Oleh");
  lcd.setCursor(3,3);
  lcd.print("Danish Abyan A");
  delay(1000);
  lcd.clear();
}

void led_indicator(){
  int state = 3;
  
  if (temperature < 22 && temperature < 28){
    state = 1;
    digitalWrite(LEDPIN, HIGH);
  } else if(temperature < 28 && state == 1){
    state = 2;
    digitalWrite(LEDPIN, HIGH);
  } else if(temperature > 28){
    state = 3;
    digitalWrite(LEDPIN, LOW);
  }
}

void loop() {
  humidity = dht.readHumidity();
  temperature = dht.readTemperature();

  lcd.setCursor(3,0);
  lcd.print("Papan Informasi");
  lcd.setCursor(3,1);
  lcd.print("SMKN 2 Klaten");

  // Temperature
  lcd.setCursor(0,2);
  lcd.print("Suhu       : ");
  lcd.setCursor(13,2);
  lcd.print(temperature);
  lcd.setCursor(19,2);
  lcd.print("C");
  // Humidity
  lcd.setCursor(0,3);
  lcd.print("Kelembapan :");
  lcd.setCursor(13,3);
  lcd.print(humidity);
  lcd.setCursor(19,3);
  lcd.print("%");
  
  delay(1000);
  lcd.clear();

  led_indicator();
}