**SMS Module** rev_01

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    - Project: **SMS Module**
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2024-12-05 22:28:25

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Develop a project utilizing the SIM900 GSM module */
    /* for sending and receiving SMS messages. Ensure the */
    /* SoftwareSerial interface on A0 and A1 is */
    /* configured for seamless communication and */
    /* implement basic command responses. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>
#include <sim900.h> //https://github.com/nthnn

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void sendSMS(const char* number, const char* message);
void receiveSMS();

/***** DEFINITION OF Software Serial *****/
const uint8_t gsm_SIM900A_Serial_PIN_SERIAL_TX_A0       = A0;
const uint8_t gsm_SIM900A_Serial_PIN_SERIAL_RX_A1       = A1;
SoftwareSerial gsm_SIM900A_Serial(gsm_SIM900A_Serial_PIN_SERIAL_RX_A1, gsm_SIM900A_Serial_PIN_SERIAL_TX_A0);

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

void setup(void)
{
    // Initialize GSM module communication
    gsm_SIM900A_Serial.begin(9600);
    Serial.begin(9600); // Initialize serial monitor communication
    Serial.println("GSM Module Ready");
}

void loop(void)
{
    // Example of sending an SMS
    sendSMS("+1234567890", "Hello from Arduino!");

    // Check for incoming SMS
    receiveSMS();

    delay(10000); // Wait for 10 seconds before sending another SMS
}

void sendSMS(const char* number, const char* message) {
    gsm_SIM900A_Serial.print("AT+CMGF=1\r"); // Set SMS to text mode
    delay(100);
    gsm_SIM900A_Serial.print("AT+CMGS=\"");
    gsm_SIM900A_Serial.print(number);
    gsm_SIM900A_Serial.print("\"\r");
    delay(100);
    gsm_SIM900A_Serial.print(message);
    delay(100);
    gsm_SIM900A_Serial.print((char)26); // Send Ctrl+Z to indicate end of message
    delay(100);
    Serial.println("SMS Sent");
}

void receiveSMS() {
    if (gsm_SIM900A_Serial.available()) {
        String response = gsm_SIM900A_Serial.readString();
        Serial.println("Received: " + response);
    }
}

/* END CODE */