/**
   IoT Ecosystem Exercise for Temperature & Huminity Monitoring System for Wokwi
   - Sensor: DHT22
   - Actuators: LED, LCD
   - Computing: ESP32
   - Connectivity: WiFi, I2C, HTTP
   - IoT Platform: ThingSpeak https://thingspeak.com/
*/ 
#include "DHTesp.h"
//**TODO***//
// Include the required libraries
#include "WiFi.h"
#include "LiquidCrystal_I2C.h"
#include "ThingSpeak.h"
// GPIOs 
//*************Sensors
const int DHT_PIN = 15; // Pin number to which the DHT22 sensor is connected

//*************Actuators
    //**TODO***//
const int LED_PIN = 32; // Define your actuators - Connect a LED to any available pinout on the ESP32

// CONNECTIVITY
//*************I2C connection
    //**TODO***//
    // Connect an LCD display to the I2C pins (SCL, SDA), and be sure to check the pinout of the ESP32
    // Define I2C connection for LCD
const int SCL_PIN = 22;
const int SDA_PIN = 21;
#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2


//*************WiFi connection
    //**TODO***//
    String ssid = "Wokwi-GUEST";
    String password = "";
    // Define WiFi credentials required for connecting to a public gateway. (Check https://docs.wokwi.com/guides/esp32-wifi)
  
//************* ThingSpeak connection
    //**TODO***//
    // Define the parameters for connecting to the ThingSpeak IoT platform (Googlee to find how to do it!) 
    unsigned long Channel_ID = 2318125; //Ingrese su numero de canal de ThingSpeak
    const char * WriteAPIKey = "4JHAM6PBXSVVBYHN"; //Ingrese su clave de API de escritura de canal
//*************Objects creation & variables definition
DHTesp dhtSensor; // Create an instance of the DHTesp library
  //**TODO***//
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
WiFiClient client;
  // Create the required objects

void setup() {

  Serial.begin(115200); // Initialize the serial communication at a baud rate of 115200
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22); // Initialize the DHT22 sensor
  //**TODO***//
  // Pin configuration
  pinMode(LED_PIN, OUTPUT);
  // Create a LCD initialization
  lcd.init();
  lcd.backlight();

  // Print something
  lcd.setCursor(0, 0);
  lcd.print("Hello, world!");
  lcd.setCursor(0, 1);
  lcd.print("Wokwi Online IoT");
  // Create a WiFi Connection initialization
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password, 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
  // Create a ThinkSpeak Connection initialization
  ThingSpeak.begin(client); //Iniciar el servidor de ThingSpeak

}

void loop() {
  
  // Reading from DHT22 sensor
  TempAndHumidity  data = dhtSensor.getTempAndHumidity(); // Read temperature and humidity from the DHT22 sensor
  
  // Storing current temperature & huminity values
  float temp = data.temperature;
  float hum = data.humidity;
  
  // Printing values in the serial monitor
  Serial.println("Temp: " + String(data.temperature, 2) + "°C"); // Print the temperature value with 2 decimal places
  Serial.println("Humidity: " + String(data.humidity, 1) + "%"); // Print the humidity value with 1 decimal place
  
    //**TODO***//
    // --Logic to activate an alert using an LED actuator if the temperature surpasses the threshold of 40°C or if the humidity falls below the 20% threshold.
    if (data.temperature > 40 || data.humidity < 20){
      digitalWrite(LED_PIN, HIGH);
    }else{
      digitalWrite(LED_PIN, LOW);
    }
    // --Logic to display the current temperature and humidity values on the LCD screen.
  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("Temp: "+ String(data.temperature, 2)  + " " + "C" + char(223));
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(data.humidity, 1) + "%");
    // --Logic to update sensor readings on ThingSpeak at regular intervals.
    ThingSpeak.setField(1, data.temperature);
    ThingSpeak.setField(2, data.humidity);
    ThingSpeak.writeFields(Channel_ID, WriteAPIKey);


  delay(10000); // Delay for 10 seconds
}