#define BUTTON_PIN 2
byte lastButtonState = HIGH;
//byte ledState = LOW;
unsigned long debounceDuration = 50; // millis
unsigned long lastTimeButtonStateChanged = 0;
int a = 0; // นับจำนวนครั้งที่กดปุ่ม

#include "DHT.h"

#define DHTPIN 3     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);

  dht.begin();

  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - lastTimeButtonStateChanged >= debounceDuration) {
    byte buttonState = digitalRead(BUTTON_PIN);
    if (buttonState != lastButtonState) {
      lastTimeButtonStateChanged = currentMillis;
      lastButtonState = buttonState;
      if (buttonState == HIGH) {
        // Serial.println("======= Press =======");
        a=a+1;
        
        float temperature = dht.readTemperature();
        float humidity = dht.readHumidity();
        if (isnan(temperature) || isnan(humidity)) {
          lcd.clear();
          lcd.setCursor(1, 0);
          lcd.print("DHT Failed!!!");
          return;
        }
        lcd.clear();
        lcd.setCursor(1, 0);
        lcd.print("Temp");
        lcd.setCursor(6, 0);
        lcd.print(temperature);
        lcd.setCursor(1, 1);
        lcd.print("Humi");
        lcd.setCursor(6, 1);
        lcd.print(humidity);
      }
    }
  }
}