/*

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Project Name : Home Automation Using IOT

Components Used : Esp32, DHT22, LCD I2C, Breadboard.

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==========================================================================================================
                                       
                                       Blynk IoT platform


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*/
#include <LiquidCrystal_I2C.h>  // Include the LiquidCrystal_I2C library for using I2C LCD
#include "DHTesp.h"  // Include the DHTesp library for using DHT temperature and humidity sensor
#include <WiFi.h>  // Include the WiFi library for ESP32 WiFi functionality
#include <ThingSpeak.h>  // Include the ThingSpeak library for sending data to ThingSpeak IoT platform

const char *ssid = "Wokwi-GUEST";  // WiFi SSID
const char *password = "";  // WiFi password
const char *apiKey = "7TNE3OXRDMJ2UY15";  // ThingSpeak API key
const int channelNumber = 2461596;  // ThingSpeak channel number

WiFiClient client;  // Declare a WiFiClient object for connecting to WiFi

LiquidCrystal_I2C lcd(0x27, 20, 4);  // Initialize a LiquidCrystal_I2C object with I2C address 0x27 and 20x4 dimensions

// Define custom characters for temperature symbol
byte t1[8] = {B00000, B00001, B00010, B00100, B00100, B00100, B00100, B00111};
byte t2[8] = {B00111, B00111, B00111, B01111, B11111, B11111, B01111, B00011};
byte t3[8] = {B00000, B10000, B01011, B00100, B00111, B00100, B00111, B11100};
byte t4[8] = {B11111, B11100, B11100, B11110, B11111, B11111, B11110, B11000};

// Define custom characters for humidity symbol
byte hum1[8] = {B00000, B00001, B00011, B00011, B00111, B01111, B01111, B11111};
byte hum2[8] = {B11111, B11111, B11111, B01111, B00011, B00000, B00000, B00000};
byte hum3[8] = {B00000, B10000, B11000, B11000, B11100, B11110, B11110, B11111};
byte hum4[8] = {B11111, B11111, B11111, B11110, B11100, B00000, B00000, B00000};

// Define custom characters for home symbol
byte house1[8] = {B00000, B00001, B00011, B00011, B00111, B01111, B01111, B11111};
byte house2[8] = {B11111, B11111, B11100, B11100, B11100, B11100, B11100, B11100};
byte house3[8] = {B00000, B10010, B11010, B11010, B11110, B11110, B11110, B11111};
byte house4[8] = {B11111, B11111, B11111, B10001, B10001, B10001, B11111, B11111};

// Define custom characters for lock symbol
byte Lck[] = {B01110, B10001, B10001, B11111, B11011, B11011, B11111, B00000};

// Define custom character for degree symbol
byte d[8] = {0b00011, 0b00011, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000};

// Initialize a DHTesp object for temperature and humidity sensor
DHTesp temps;  // Declare an instance of the DHTesp class for temperature and humidity sensing

void connectWiFi() {
  Serial.println("Connecting to WiFi...");  // Print message to Serial Monitor
  WiFi.begin(ssid, password);  // Connect to WiFi network using provided SSID and password
  while (WiFi.status() != WL_CONNECTED) {  // Wait until WiFi connection is established
    delay(1000);  // Wait for 1 second
    Serial.println("Connecting to WiFi...");  // Print message to Serial Monitor
  }
  Serial.println("Connected to WiFi");  // Print message to Serial Monitor
}

void displayWelcomeMessage() {
lcd.clear();  // Clear the LCD screen
lcd.createChar(6, Lck);  // Create custom character for lock symbol
lcd.createChar(1, house1);  // Create custom character for house symbol
lcd.createChar(2, house2);  // Create custom character for house symbol
lcd.createChar(3, house3);  // Create custom character for house symbol
lcd.createChar(4, house4);  // Create custom character for house symbol
lcd.setCursor(1, 2);  // Set cursor position for displaying house symbol
lcd.write(1);  // Display house symbol
lcd.setCursor(1, 3);  // Set cursor position for displaying house symbol
lcd.write(2);  // Display house symbol
lcd.setCursor(2, 2);  // Set cursor position for displaying house symbol
lcd.write(3);  // Display house symbol
lcd.setCursor(2, 3);  // Set cursor position for displaying house symbol
lcd.write(4);  // Display house symbol

lcd.setCursor(17, 2);  // Set cursor position for displaying house symbol
lcd.write(1);  // Display house symbol
lcd.setCursor(17, 3);  // Set cursor position for displaying house symbol
lcd.write(2);  // Display house symbol
lcd.setCursor(18, 2);  // Set cursor position for displaying house symbol
lcd.write(3);  // Display house symbol
lcd.setCursor(18, 3);  // Set cursor position for displaying house symbol
lcd.write(4);  // Display house symbol

lcd.setCursor(19, 0);  // Set cursor position for displaying lock symbol
  lcd.write(6);  // Display lock symbol
  lcd.setCursor(9, 0);
  lcd.print("connected-");  // Print message to LCD
  lcd.setCursor(2, 1);
  lcd.print("HOME AUTOMATION");  // Print message to LCD
  lcd.setCursor(6, 2);
  lcd.print("USING IOT");  // Print message to LCD
  delay(3000);  // Delay for 3 seconds
}

void setup() {
  Serial.begin(115200);  // Initialize serial communication at baud rate 115200

  lcd.init();  // Initialize the LCD
  lcd.backlight();  // Turn on the backlight of the LCD

  displayWelcomeMessage(); // Call the function to display the welcome message on the LCD

  connectWiFi(); // Call the function to connect to the WiFi network

  ThingSpeak.begin(client); // Initialize ThingSpeak with the WiFi client object

  temps.setup(15, DHTesp::DHT22);  // Initialize the DHT sensor with pin 15 and DHT22 sensor type
  delay(2000);  // Delay for 2 seconds
}


void loop() {
  TempAndHumidity x = temps.getTempAndHumidity(); // Get temperature and humidity readings from the DHT sensor
  float tmp = x.temperature; // Store the temperature value
  float hum = x.humidity; // Store the humidity value

  ThingSpeak.setField(1, tmp); // Set the first field of ThingSpeak to the temperature value
  ThingSpeak.setField(2, hum); // Set the second field of ThingSpeak to the humidity value
  int status = ThingSpeak.writeFields(channelNumber, apiKey); // Write the data to ThingSpeak and get the status

  if (status == 200) { // Check if the data was sent successfully
    Serial.println("Data sent to ThingSpeak successfully"); // Print success message to serial monitor
  } else {
    Serial.print("Error sending data to ThingSpeak: "); // Print error message to serial monitor
    Serial.println(status); // Print the status code to serial monitor
  }
  lcd.clear(); // Clear the LCD display
  lcd.createChar(1,t1); // Create custom character for temperature symbol
  lcd.createChar(2,t2); // Create custom character for temperature symbol
  lcd.createChar(3,t3); // Create custom character for temperature symbol
  lcd.createChar(4,t4); // Create custom character for temperature symbol
  lcd.createChar(5, d); // Create custom character for degree symbol
  lcd.createChar(6, Lck); // Create custom character for lock symbol

  lcd.setCursor(19,0); // Set cursor position for lock symbol
  lcd.write(6); // Display lock symbol
  lcd.setCursor(1,1); // Set cursor position for temperature symbol
  lcd.write(1); // Display temperature symbol
  lcd.setCursor(1,2); // Set cursor position for temperature symbol
  lcd.write(2); // Display temperature symbol
  lcd.setCursor(2,1); // Set cursor position for temperature symbol
  lcd.write(3); // Display temperature symbol
  lcd.setCursor(2,2); // Set cursor position for temperature symbol
  lcd.write(4); // Display temperature symbol
  lcd.setCursor(4,1); // Set cursor position for temperature label
  lcd.print("Temperature :"); // Print temperature label
  lcd.setCursor(7,2); // Set cursor position for temperature value
  lcd.print(tmp); // Print temperature value
  lcd.setCursor(11,2); // Set cursor position for degree symbol
  lcd.write(5); // Display degree symbol
  lcd.setCursor(12,2); // Set cursor position for unit (Celsius)
  lcd.print("C"); // Print unit (Celsius)

  delay(750); // Delay for 750 milliseconds
  lcd.clear(); // Clear the LCD display

  lcd.createChar(1,hum1); // Create custom character for humidity symbol
  lcd.createChar(2,hum2); // Create custom character for humidity symbol
  lcd.createChar(3,hum3); // Create custom character for humidity symbol
  lcd.createChar(4,hum4); // Create custom character for humidity symbol
  
  lcd.setCursor(19,0); // Set cursor position for lock symbol
  lcd.write(6); // Display lock symbol
  lcd.setCursor(3,1); // Set cursor position for humidity symbol
  lcd.write(1); // Display humidity symbol
  lcd.setCursor(3,2); // Set cursor position for humidity symbol
  lcd.write(2); // Display humidity symbol
  lcd.setCursor(4,1); // Set cursor position for humidity symbol
  lcd.write(3); // Display humidity symbol
  lcd.setCursor(4,2); // Set cursor position for humidity symbol
  lcd.write(4); // Display humidity symbol
  lcd.setCursor(6,1); // Set cursor position for humidity label
  lcd.print("Humidity :"); // Print humidity label
  lcd.setCursor(7,2); // Set cursor position for humidity value
  lcd.print(hum); // Print humidity value
  lcd.setCursor(12,2); // Set cursor position for humidity unit (%)
  lcd.print("%"); // Print humidity unit (%)
  delay(750); // Delay for 750 milliseconds
}