/* Antero Metso the 6th of November 2022 */
/* Code for the Final Project            */
/* (C) Copyright 2022 Antero Metso       */
/* Distributed under Fab licence        */

#include <Wire.h>  // Required by LiquidCrystal
#include <LiquidCrystal_I2C.h> // For communicating with the LCD
#include <DHTStable.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#define RELAYPIN 0 // A pin between LedPin and DHTPin (2nd from top, left connector)
#define DHTPIN 4  // DHTpin is the 3rd from top, left connector.
#define DHTTYPE DHT22   // DHT 22  (AM2302)

DHTStable DHT; // initialize the DHT library

// Initialize the humidity and temperature variables

int humidity =0;
int temperature =0;

void setup()
{
  lcd.init();
  
  pinMode(RELAYPIN, OUTPUT);
  pinMode(DHTPIN, INPUT);
  // Print the initialization message to the LCD.
  lcd.backlight(); // Turn backlight on
  lcd.setCursor(0,0); // Set cursor to top left corner and type the text
 // lcd.print("Keyes AM2302 DHT-22"); 
  lcd.setCursor(2,1);
  lcd.print("Test");
}

/* The Main Loop */    
void loop()
{
  lcd.init(); // Initialize LCD.
  int chk = DHT.read22(DHTPIN); // Read DHT22 data.

  lcd.setCursor(0,0); // Set cursor to upper left corner 
                      // for printing the status information
  // Print the status of the DHT22 sensor based on the information

  switch (chk)
    {
    case DHTLIB_OK:
        lcd.print("Read Status OK");
        break;
    case DHTLIB_ERROR_CHECKSUM:
        lcd.print("Checksum err");
        break;
    case DHTLIB_ERROR_TIMEOUT:
        lcd.print("Time out err");
        break;
    default:
        lcd.print("Unknown err");
        break;
    }

  // Reading takes about 250 milliseconds
  // Data may be 2 seconds old

  // Read temperature.
  temperature  = DHT.getTemperature(); 
  
  // Read humidity
  humidity = DHT.getHumidity();

/* Print Humidity on LCD */
  
  lcd.setCursor(0,1);
  lcd.print("Humidity:");
  lcd.setCursor(14,1);
  lcd.print(humidity);
  lcd.setCursor(18,1);
  lcd.print("%");

/* Print Temperature on LCD */
  
  lcd.setCursor(0,2);
  lcd.print("Temp:");
  lcd.setCursor(14,2);
  lcd.print(temperature);
  lcd.setCursor(18,2);
  lcd.print("C");


/* See if temperature is over limit and control relay */
if (temperature > 35)
{ // Turn relay OFF, print OFF
  lcd.setCursor(0,3);
  lcd.print("OFF");
  digitalWrite(RELAYPIN,0);

} else {
  // Turn relay ON, print ON
  lcd.setCursor(0,3);
  lcd.print("ON");
  digitalWrite(RELAYPIN,1);
};
  delay(3000); /* Add a 3 second delay in the loop */
  }