// Arduino Mini Thermostat
// Made by: Vasco2020

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

#define DHTPIN 12     // digital pin for the DHT22 sensor
#define DHTTYPE DHT22   // DHT22 sensor

DHT dht(DHTPIN, DHTTYPE);  // create a DHT object
RTC_DS1307 rtc;  // create an RTC object

//LCD Stuff
LiquidCrystal_I2C lcd(0x27, 16, 2); //Display Resolution
void setup() {
  Serial.begin(9600);
  // start I2C communication
  Wire.begin();
  // start the DHT22 sensor
  dht.begin();
  // start the DS1307 RTC
  rtc.begin();
  // Start up the library
  lcd.init(); //Start the display
  lcd.backlight(); //Turn ON Display Light
}

void loop() {
  // read the temperature and humidity from the DHT22 sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // check if the readTemperature() or readHumidity() functions returned a valid value
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Error reading temperature or humidity from DHT22 sensor!");
    return;
  }
  
  // read the time from the DS1307 RTC
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print("Time:   ");
  if (now.hour() <= 9) {
    lcd.print("0");
  };
  lcd.print(now.hour());
  lcd.print(":");
  if (now.minute() <= 9) {
    lcd.print("0");
  };
  lcd.print(now.minute());
  lcd.print(":");
  if (now.second() <= 9) {
    lcd.print("0");
  };
  lcd.print(now.second());
  // print the temperature, humidity, and time to the serial console
  lcd.setCursor(0,1);
  lcd.print("Temp:    ");
  lcd.print(temperature);
  lcd.print("C   ");
  delay(100);
}