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

#define DHTPIN 3     //Pin ขาสำหรับ เสียบกับ Nodemcu
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);   //Module IIC/I2C Interface บางรุ่นอาจจะใช้ 0x3f

const int buttonPin = 4;

void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");
  
  dht.begin();
  
  lcd.init(); // Initialize the LCD
  lcd.backlight();

  pinMode(buttonPin, INPUT_PULLUP);
}


void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
 
 
  lcd.home();
  lcd.print("Temp (C) : ");
  lcd.print(t);
  lcd.setCursor(0, 1);
  lcd.print("Humidity : ");
  lcd.print(h);
  lcd.print("%");

  waitForButtonPress();

  lcd.setCursor(0, 0);
  lcd.print("Temp (F) : ");
  lcd.print(f);
  lcd.setCursor(0, 1);
  lcd.print("Humidity : ");
  lcd.print(h);
  lcd.print("%");


}


void waitForButtonPress() {
  while (digitalRead(buttonPin) == HIGH) {
    // Do nothing here until a button is pressed
  }
  delay(200); // Debouncing delay
}