/**
   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"
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "ThingSpeak.h"
//**TODO***//

// Include the required libraries

// GPIOs 
//*************Sensors
const int DHT_PIN = 15; // Pin number to which the DHT22 sensor is connected

//*************Actuators
    //**TODO***//
    // Define your actuators - Connect a LED to any available pinout on the ESP32
const int ledPin = 13;

// CONNECTIVITY
//*************I2C connection
int lcdColumns = 16;
int lcdRows = 2;
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

//*************WiFi connection

    //**TODO***//
    // Define WiFi credentials required for connecting to a public gateway. (Check https://docs.wokwi.com/guides/esp32-wifi)

unsigned long myChannelNumber = 1;
const char * myWriteAPIKey = "I9IFUUE6HFMAXR13";

WiFiClient  client;

//************* ThingSpeak connection
    //**TODO***//

const char* ssid = "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";   // your network password
    // Define the parameters for connecting to the ThingSpeak IoT platform (Googlee to find how to do it!) 

//*************Objects creation & variables definition
DHTesp dhtSensor; // Create an instance of the DHTesp library
  //**TODO***//
  // 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 (ledPin, OUTPUT);
  // Create a LCD initialization
  lcd.init();                   
  lcd.backlight();
  // Create a WiFi Connection initialization
  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);
}

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(temp, 2) + "°C"); // Print the temperature value with 2 decimal places
  Serial.println("Humidity: " + String(hum, 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)||(hum<20)){
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
    // --Logic to display the current temperature and humidity values on the LCD screen.
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temp, 2) + " C");
  lcd.setCursor(0,1);
  lcd.print("Humidity: " + String(hum, 1) + "%");
    // --Logic to update sensor readings on ThingSpeak at regular intervals.
  ThingSpeak.setField(1, temp);
  ThingSpeak.setField(2, hum);
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if(x == 200){
    Serial.println("Channel update successful.");
  }
  else{
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  delay(10000);
}