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

#define DHTPIN 18
#define DHTTYPE DHT22

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);
RTC_DS1307 rtc;

int RELAY_PIN = 13;
int VAR_RESISTOR_PIN = 32;
int relayState = digitalRead(RELAY_PIN);
void setup() {
  Serial.begin(9600);

  lcd.init();  // เริ่มต้นจอแอลซีดี
  lcd.backlight();

  Serial.println(F("DHTxx test!"));
  dht.begin();
  pinMode(RELAY_PIN, OUTPUT);

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1)
      ;
  }
  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
 int relayState = digitalRead(RELAY_PIN);
 float temp = dht.readTemperature();
 float pot_value = analogRead(VAR_RESISTOR_PIN) * 100.0 / 4000.0;
 DateTime now = rtc.now();
 
  lcd.setCursor(0, 0);
  lcd.print("T");
  lcd.print(temp);
  lcd.print("C  ");
  lcd.setCursor(8, 0);
  lcd.print("P");
  lcd.print(pot_value);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);
  lcd.println();
  if (relayState == 1) {
    lcd.setCursor(9, 1);
    lcd.print("ON");
    Serial.println("Relay: ON");
  } else {
    lcd.setCursor(9, 1);
    lcd.print("OFF");
    Serial.println("Relay: OFF");
  }

 if (temp < 30 && pot_value < 60 && now.second() % 9 == 0) {
    digitalWrite(RELAY_PIN, 1);
    int startSeconds = now.second();
    while (now.second() - startSeconds < 3) {
       now = rtc.now();
    }
    digitalWrite(RELAY_PIN, 0); 
  }
 else {
    digitalWrite(RELAY_PIN,0 );
  }
  Serial.print("Temp:");
  Serial.print(temp);
  Serial.print("Potentiometer");
  Serial.print(pot_value);
  Serial.print("%");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.print(':');
 
 
  delay(500);// รอ 1 วินาที
}