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



#define RELAYPIN 9
#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS3231 rtc;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Hello, world!");
  dht.begin();
  rtc.begin();
  pinMode(RELAYPIN, OUTPUT);
  digitalWrite(RELAYPIN, LOW);
  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  DateTime now = rtc.now();
  delay(1000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.println();
  lcd.setCursor(0, 0);
  lcd.print(now.year());
  lcd.print("/");
  lcd.print(now.month());
  lcd.print("/");
  lcd.print(now.day());
  lcd.print(" ");
  lcd.print(now.hour());
  lcd.print(":");
  lcd.print(now.minute());
  lcd.setCursor(0, 1);
  lcd.print("T:");
  lcd.print(t);
  lcd.print(" L:");
  lcd.print("OFF");
  //8AM-3PM   for 10 minutes
  if (now.hour() == 8 || now.hour() == 9 || now.hour() == 10 || now.hour() == 11 || now.hour() == 12 || now.hour() == 13 || now.hour() == 14 || now.hour() == 15) {
    if (now.minute() <= 10) {
      if (now.second() <= 20) {
        digitalWrite(RELAYPIN, HIGH);
        lcd.setCursor(10, 1);
        lcd.print("ON ");
        delay(1000);
      }
      else {
        digitalWrite(RELAYPIN, LOW);
        lcd.setCursor(10, 1);
        lcd.print("OFF");
      }
    }
    else {
      digitalWrite(RELAYPIN, LOW);
      lcd.setCursor(10, 1);
      lcd.print("OFF");
    }
  }
  else {
    digitalWrite(RELAYPIN, LOW);
    lcd.setCursor(10, 1);
    lcd.print("OFF");
  }
}