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	- Project: Environmental Monitor
	- Source Code NOT compiled for: ESP32 DevKit V1
	- Source Code created on: 2024-10-19 18:17:19

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* The project shall incorporate the MQ2 gas sensor */
	/* for detecting air quality, integrating data with */
	/* the DFPlayer Mini for audio feedback, enhancing */
	/* user interaction in a smart home environment. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include  // https://github.com/plerup/espsoftwareserial
#include      // https://github.com/ErickSimoes/Ultrasonic
#include            // https://github.com/adafruit/DHT-sensor-library
#include            // Include the MQ2 library for gas sensing
#include  // Include the DFPlayer Mini library for audio playback

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t Ultra_HC_SR04_Echo_PIN_D13        = 13;
const uint8_t Temp_DHT11_DOUT_PIN_D14            = 14;

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t Smog_MQ2_AOUT_PIN_D25              = D25; // MQ2 sensor output pin

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t Ultra_HC_SR04_Trigger_PIN_D4       = 4;

/***** DEFINITION OF Software Serial *****/
const uint8_t Df_DFPlayerMini_Serial_PIN_SERIAL_TX_D18 = 18;
const uint8_t Df_DFPlayerMini_Serial_PIN_SERIAL_RX_D19 = 19;
EspSoftwareSerial::UART Df_DFPlayerMini_Serial;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
bool Ultra_HC_SR04_Trigger_PIN_D4_rawData        = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
float Ultra_HC_SR04_Trigger_PIN_D4_phyData       = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Create the ultrasonic object using the correct constructor
Ultrasonic ultrasonic(Ultra_HC_SR04_Trigger_PIN_D4, Ultra_HC_SR04_Echo_PIN_D13); // Create the ultrasonic object

// Create the DHT object using the correct constructor
#define DHTTYPE DHT11 // Define the type of DHT sensor
DHT dht(Temp_DHT11_DOUT_PIN_D14, DHTTYPE); // Create the DHT object

// Create the MQ2 object
MQ2 mq2(Smog_MQ2_AOUT_PIN_D25); // Create the MQ2 gas sensor object

// Create the DFPlayer Mini object
DFPlayer_Mini_Mp3 dfPlayer; // Create the DFPlayer object

// Define a threshold for gas concentration
const float threshold = 300.0; // Example threshold value for gas concentration

void setup(void)
{
    Serial.begin(9600); // Initialize serial communication for debugging

    pinMode(Ultra_HC_SR04_Echo_PIN_D13, INPUT);
    pinMode(Temp_DHT11_DOUT_PIN_D14, INPUT_PULLUP);
    pinMode(Smog_MQ2_AOUT_PIN_D25, INPUT);
    pinMode(Ultra_HC_SR04_Trigger_PIN_D4, OUTPUT);

    Df_DFPlayerMini_Serial.begin(9600, SWSERIAL_8N1, Df_DFPlayerMini_Serial_PIN_SERIAL_RX_D19, Df_DFPlayerMini_Serial_PIN_SERIAL_TX_D18, false);

    // Initialize the ultrasonic sensor
    ultrasonic.attach(Ultra_HC_SR04_Trigger_PIN_D4, Ultra_HC_SR04_Echo_PIN_D13);

    // Initialize the DHT sensor
    dht.begin(); // Start the DHT sensor

    // Initialize the MQ2 sensor
    mq2.begin(); // Start the MQ2 sensor

    // Initialize DFPlayer Mini
    dfPlayer.begin(Df_DFPlayerMini_Serial); // Start the DFPlayer Mini
}

void loop(void)
{
    // Refresh output data
    updateOutputs(); 

    // Read temperature and humidity from DHT sensor
    float temperature = dht.readTemperature(); // Read temperature as Celsius
    float humidity = dht.readHumidity(); // Read humidity

    // Check if any reads failed and exit early (to try again).
    if (isnan(temperature) || isnan(humidity)) {
        Serial.println(F("Failed to read from DHT sensor!"));
        return;
    }

    // Print the results to the Serial Monitor
    Serial.print(F("Temperature: "));
    Serial.print(temperature);
    Serial.println(F("°C"));
    Serial.print(F("Humidity: "));
    Serial.print(humidity);
    Serial.println(F("%"));

    // Read gas concentration from MQ2 sensor
    float gasConcentration = mq2.read(); // Read gas concentration
    Serial.print(F("Gas Concentration: "));
    Serial.println(gasConcentration);

    // Check gas concentration and play audio feedback if necessary
    if (gasConcentration > threshold) { // Check against defined threshold
        dfPlayer.play(1); // Play the first audio file
    }
}

void updateOutputs()
{
    digitalWrite(Ultra_HC_SR04_Trigger_PIN_D4, Ultra_HC_SR04_Trigger_PIN_D4_rawData);
}

/* END CODE */