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

LiquidCrystal_I2C lcd(0x27, 16, 2);

RTC_DS1307 rtc;

#define DHTPIN 27
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
int Relay = 13;
int vr = 32;
int D;

void setup() {
  pinMode(Relay, OUTPUT);
  pinMode(vr, INPUT);
  digitalWrite(Relay, LOW);
  
  lcd.init();
  lcd.backlight();
  Serial.begin(57600);
  dht.begin();

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

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

  }

}

void loop() {

  DateTime now = rtc.now();

  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Temperature: "));
  Serial.print(f);
  Serial.print(F("°F "));


  int val = analogRead(vr);
  int  percent = map(val, 0, 4095, 0, 100);
  lcd.setCursor(0, 0);
  lcd.printf("%.2f f   %d ", f, percent);
  lcd.print('%');
  Serial.printf("%d ", f, percent);

  Serial.print(val);
  Serial.print("\t");
  Serial.println(percent);


  if (percent < 35 && f > 15) {
    if   (now.second() % 15 == 0 )
    {
      digitalWrite(Relay, 1);
      D = 1;
    }
    else if (now.second() % 3 == 0 )
    {
      digitalWrite(Relay, 0);
      D = 0;
    }

  } else {

    digitalWrite(Relay, 0);
    D = 0;
  }
  if (D == 1) {
    Serial.println("Relay On");
    lcd.setCursor(13, 1);
    lcd.print("ON");
  }
  else {
    Serial.println("Relay Off");
    lcd.setCursor(13, 1);
    lcd.print("OFF");
  }
  lcd.setCursor(0, 1);           //แสดงเวลา
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  lcd.print(now.minute(), DEC);
  lcd.print(":");
  lcd.print(now.second(), DEC);

  delay(900);
  lcd.clear();
}