//inisial nilai pin yang digunakan
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int ledPinRed = 18;
const int ledPinGreen = 5;
const int pushButton = 4;
const int DHT_Pin =2;      // The DHT pin 
float temperature ;       // Sensor temperature
float  humidity;          // Sensor Humidity
DHT dht(DHT_Pin, DHT22);


bool lcdOn = true;        // Status LCD, defaultnya aktif
bool displayTemp = true;  // Status untuk menampilkan suhu atau kelembapan
bool systemOn = true;     // Status perangkat hidup/mati
bool buttonState = HIGH;  // Status awal tombol (off)


void setup() {
  Serial.begin(115200);
  pinMode(ledPinRed, OUTPUT);
  pinMode(ledPinGreen, OUTPUT);
  pinMode(pushButton, INPUT);
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("ICT ATS PROJECT");
  lcd.setCursor(0, 1);
  lcd.print("about H&T sensor");
  delay(1000);
}
void loop() {
  int newButtonState = digitalRead(pushButton);
  if (newButtonState == LOW && buttonState == HIGH) {
    // Tombol ditekan, toggle status perangkat
    systemOn = !systemOn;

    if (systemOn) {
      // Perangkat dihidupkan kembali, tampilkan pesan di LCD
      lcdOn = true;
      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("SYSTEM ON");
      delay(1000);
      lcd.setCursor(0, 1); // Pindahkan kursor ke baris kedua
      lcd.print("                "); // Menghapus baris kedua dengan karakter kosong (spasi)
    } else {
      
      lcdOn = false;
      digitalWrite(ledPinGreen, LOW);
      digitalWrite(ledPinRed, LOW);
      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("SYSTEM OFF");
      delay(1000);
    }
  }
  buttonState = newButtonState;



  Serial.println(buttonState);
  if (buttonState == 1){
    float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  lcd.setCursor(6, 0);
  lcd.print(temperature);
  lcd.print(" c ");
  lcd.setCursor(12, 1);
  lcd.print(humidity);
  lcd.print(" % ");
  delay(500);
  
  if (temperature >15.0) {
    {
  digitalWrite(ledPinRed, HIGH);
  digitalWrite(ledPinGreen, LOW);
  lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("HIGH TEMPRATURE");
    lcd.setCursor(6, 1);
    lcd.print("ALERT!");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    lcd.setCursor(0, 1);
    lcd.print("Kelembapan: ");
  }
  }
  else {
    {
  digitalWrite(ledPinGreen, HIGH);
  digitalWrite(ledPinRed, LOW);
  lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print("low temprature");
    lcd.setCursor(4, 1);
    lcd.print("all safe");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    lcd.setCursor(0, 1);
    lcd.print("Kelembapan: ");
  }
  }
  }
}