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

#define DHTPIN 12 // pin dht
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define LED_HIJAU 27
#define LED_KUNING 18
#define LED_MERAH 14
#define BUZZER 26


void setup() {
  Serial.begin(115200);
  dht.begin(); // membaca dht
  Wire.begin(22, 21); 
  lcd.init();
  lcd.backlight();

  pinMode(LED_MERAH, OUTPUT);
  pinMode(LED_KUNING, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);
  pinMode(BUZZER, OUTPUT);

}

void loop() {
  float suhu = dht.readTemperature(); // rumus suhu
  float kelembaban = dht.readHumidity(); // rumus kelembaban

  Serial.print("Suhu: ");
  Serial.print(suhu);
  Serial.print((char)176); // kode menampilkan simbol derajat di monitor
  Serial.print("C  |  Kelembaban: ");
  Serial.print(kelembaban);
  Serial.println("%");

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(suhu);
  lcd.print(" H:");
  lcd.print(kelembaban);

  digitalWrite(LED_HIJAU, LOW);
  digitalWrite(LED_KUNING, LOW);
  digitalWrite(LED_MERAH, LOW);
  noTone(BUZZER);

  if (suhu < 30) {
    lcd.setCursor(0, 1);
    lcd.print("Status: Aman   ");

    digitalWrite(LED_HIJAU, HIGH);
    delay(1000);
    digitalWrite(LED_HIJAU, LOW);
    delay(1000);
  }

  // Suhu > 30 (OKE)
  else if (suhu >= 30 && suhu < 40) {
    lcd.setCursor(0, 1);
    lcd.print("Status: Oke    ");

    digitalWrite(LED_HIJAU, HIGH);
    noTone(BUZZER);
    delay(500);
  }

  // Suhu > 40 (WASPADA)
  else if (suhu >= 40 && suhu < 50) {
    lcd.setCursor(0, 1);
    lcd.print("Status: Waspada!");

    tone(BUZZER, 262); // nada DO

    digitalWrite(LED_KUNING, HIGH);
    delay(200);
    digitalWrite(LED_KUNING, LOW);
    delay(200);
  }

  // Suhu > 50 (STOP)
  else if (suhu >= 50) {
    lcd.setCursor(0, 1);
    lcd.print("Status: STOP!!!");

    tone(BUZZER, 392); // nada SOL

    digitalWrite(LED_MERAH, HIGH);
    delay(100);
    digitalWrite(LED_MERAH, LOW);
    delay(100);
  }
}