"SMS Notifications" rev_01

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    - Project: "SMS Notifications"
    - Source Code NOT compiled for: ESP32 DevKit V1
    - Source Code created on: 2024-10-31 07:42:42

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* The system shall utilize the Sim800L module for */
    /* GSM communication, integrating with a DHT22 sensor */
    /* to monitor temperature and humidity, while */
    /* ensuring reliable data transmission through */
    /* SoftwareSerial. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h> // https://github.com/plerup/espsoftwareserial
#include <Sim800L.h>       // https://github.com/vittorioexp/Sim800L-Arduino-Library-revised
#include <DHT.h>          // https://github.com/adafruit/DHT-sensor-library

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t SIM800L_RING_PIN_D16       = 16;
const uint8_t DHT22_DOUT_PIN_D18         = 18;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t SIM800L_RST_PIN_D14        = 14;
const uint8_t SIM800L_DTR_PIN_D17        = 17;

/***** DEFINITION OF Software Serial *****/
const uint8_t SIM800L_Serial_PIN_SERIAL_TX_D4        = 4;
const uint8_t SIM800L_Serial_PIN_SERIAL_RX_D13       = 13;
EspSoftwareSerial::UART SIM800L_Serial;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool SIM800L_RST_PIN_D14_rawData       = 0;
bool SIM800L_DTR_PIN_D17_rawData       = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float SIM800L_RST_PIN_D14_phyData       = 0.0;
float SIM800L_DTR_PIN_D17_phyData       = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES *****/
Sim800L GSM(SIM800L_Serial_PIN_SERIAL_RX_D13, SIM800L_Serial_PIN_SERIAL_TX_D4, SIM800L_RST_PIN_D14); // Initialize SIM800L with RX, TX, and RST pins

// Initialize DHT sensor
#define DHTPIN DHT22_DOUT_PIN_D18 // Define the pin where the DHT22 is connected
#define DHTTYPE DHT22             // Define the type of DHT sensor
DHT dht(DHTPIN, DHTTYPE);          // Create an instance of the DHT class

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

    // Set pin modes for inputs and outputs
    pinMode(SIM800L_RING_PIN_D16, INPUT_PULLUP);
    pinMode(DHT22_DOUT_PIN_D18, INPUT_PULLUP);
    pinMode(SIM800L_RST_PIN_D14, OUTPUT);
    pinMode(SIM800L_DTR_PIN_D17, OUTPUT);

    // Initialize Software Serial for SIM800L
    SIM800L_Serial.begin(9600, SWSERIAL_8N1, SIM800L_Serial_PIN_SERIAL_RX_D13, SIM800L_Serial_PIN_SERIAL_TX_D4, false);
    GSM.begin(9600); // Initialize the GSM module with a baud rate of 9600

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

void loop(void)
{
    // Refresh output data
    updateOutputs();
    // Read data from DHT sensor
    readDHTSensor();
    // Send data via GSM
    sendDataViaGSM();
}

void updateOutputs()
{
    // Update the state of the SIM800L reset and DTR pins
    digitalWrite(SIM800L_RST_PIN_D14, SIM800L_RST_PIN_D14_rawData);
    digitalWrite(SIM800L_DTR_PIN_D17, SIM800L_DTR_PIN_D17_rawData);
}

void readDHTSensor()
{
    // Read humidity and temperature from DHT sensor
    float h = dht.readHumidity();
    float t = dht.readTemperature();

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

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

void sendDataViaGSM()
{
    // Prepare the message to send
    char message[100];
    snprintf(message, sizeof(message), "Humidity: %.2f%%, Temperature: %.2f°C", dht.readHumidity(), dht.readTemperature());

    // Send the SMS
    char* number = "2926451386"; // Replace with the recipient's phone number
    bool error = GSM.sendSms(number, message);

    // Check if SMS was sent successfully
    if (error) {
        Serial.println(F("SMS sent successfully!"));
    } else {
        Serial.println(F("Failed to send SMS!"));
    }
}

/* END CODE */