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GSM GPRS SIM900A Modem- Arduino Compatible

This is a very low cost and simple Arduino GSM and GPRS shield. We use the module SIMCom SIM900A.

The Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS coverage and follow a few simple instructions to start controlling your world through the internet. You can also make/receive voice calls (you will need an external speaker and microphone circuit) and send/receive SMS messages.

 Order Code : RDL/RGS/14/001/V1.0

SIM900A Module is Outdated and updated vesrion of the module given below link.

GSM GPRS SIM800C

Availability: Out of stock

₹1,461.00
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Questions:

Posted by niashsio, Tuesday, 16 December 2014 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Dear Sir, Please Find the code below :

    • GPRS CODE :


    int8_t answer;
    int onModulePin = 9;
    int seconds = 20;
    char aux_str[30];

    char phone_number[]="1234567890"; // ********* is the number to call

    void setup(){

    pinMode(onModulePin, OUTPUT);
    Serial.begin(9600);


    power_on();

    delay(3000);



    delay(3000);

    Serial.println("Connecting to the network...");

    while( (sendATcommand("AT+CREG?", "+CREG: 0,1", 500) ||
    sendATcommand("AT+CREG?", "+CREG: 0,5", 500)) == 0 );

    sprintf(aux_str, "ATD%s;", phone_number);
    sendATcommand(aux_str, "OK", 10000);


    delay(seconds * 1000);

    Serial.println("ATH"); // disconnects the existing call

    }

    void loop(){

    }

    void power_on(){

    uint8_t answer=0;

    // checks if the module is started
    answer = sendATcommand("AT", "OK", 2000);
    if (answer == 0)
    {
    // power on pulse
    digitalWrite(onModulePin,HIGH);
    delay(3000);
    digitalWrite(onModulePin,LOW);

    // waits for an answer from the module
    while(answer == 0){ // Send AT every two seconds and wait for the answer
    answer = sendATcommand("AT", "OK", 2000);
    }
    }

    }

    int8_t sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout){

    uint8_t x=0, answer=0;
    char response[100];
    unsigned long previous;

    memset(response, '\0', 100); // Initialize the string

    delay(100);

    while( Serial.available() > 0) Serial.read(); // Clean the input buffer

    Serial.println(ATcommand); // Send the AT command


    x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
    // if there are data in the UART input buffer, reads it and checks for the asnwer
    if(Serial.available() != 0){
    response[x] = Serial.read();
    x++;
    // check if the desired answer is in the response of the module
    if (strstr(response, expected_answer) != NULL)
    {
    answer = 1;
    }
    }
    // Waits for the asnwer with time out
    }while((answer == 0) && ((millis() - previous) < timeout));

    return answer;
    }

     

    • Soft Serial GPRS Code :

    #include <SoftwareSerial.h>

    SoftwareSerial mySerial(2, 3); // RX, TX


    int8_t answer;
    int onModulePin= 9;

    char data[512];
    int data_size;

    char aux_str[100];
    char aux;
    int x = 0;


    void setup(){

    pinMode(onModulePin, OUTPUT);
    mySerial.begin(9600);

    mySerial.println("Starting...");
    power_on();
    // Serial.begin(9600);
    delay(3000);

     

    delay(3000);

    while (sendATcommand2("AT+CREG?", "+CREG: 0,1", "+CREG: 0,5", 2000) == 0);


    sendATcommand("AT+SAPBR=3,1,\"Contype\",\"GPRS\"", "OK", 2000);
    sendATcommand("AT+SAPBR=3,1,\"APN\",\"WWW\"", "OK", 2000);


    while (sendATcommand("AT+SAPBR=1,1", "OK", 20000) == 0)
    {
    delay(5000);
    }

    }
    void loop(){
    // Initializes HTTP service
    answer = sendATcommand("AT+HTTPINIT", "OK", 10000);
    if (answer == 1)
    {
    // Sets CID parameter
    answer = sendATcommand("AT+HTTPPARA=\"CID\",1", "OK", 5000);
    if (answer == 1)
    {
    // Sets url
    // 103.231.8.219/IndriynEnergyService/api/IndriynEthernetPost?strPostObj=INDRIYN2|ACA^0^22.22|ACB^0^33.30|ACC^0^44.11
    mySerial.print("AT+HTTPPARA=\"URL\",\"103.231.8.219/IndriynEnergyService/api/IndriynEthernetPost?strPostObj=");
    delay(100);
    mySerial.print("INDRIYN2|ACA^0^22.22|ACB^0^33.30|ACC^0^44.11");
    delay(100);


    answer = sendATcommand("\"", "OK", 10000);
    if (answer == 1)
    {
    // Starts GET action
    delay(1000);
    answer = sendATcommand("AT+HTTPACTION=0", "+HTTPACTION:0,200", 12000);

    if (answer == 1)
    {
    x=0;
    do{
    answer = sendATcommand("AT+HTTPREAD=0,200","+HTTPREAD:", 10000);
    if (answer == 1)
    {
    // Serial.print("ok = " );
    x=0;

    do{

    if(mySerial.available() > 0){

    data[x] = mySerial.read();

    x++;

    if (strstr(data, "OK") != NULL)
    {
    answer = 1;
    }

    }
    }while(answer == 0); // Waits for the asnwer with time out

    data[x] = '\0';
    mySerial.println(data);

    }
    else if (answer == 2)
    {
    mySerial.println("Error from HTTP");
    }
    else
    {
    mySerial.println("Error getting the url");
    data_size = 0;
    }

    sendATcommand("", "+HTTPACTION:0,200", 20000);
    }while (data_size > 0);

    mySerial.print("Data received: ");
    // mySerial.println(data);
    }
    else
    {
    // mySerial.println("Error getting the url");
    }
    }
    else
    {
    // mySerial.println("Error setting the url");
    }
    }
    else
    {
    // mySerial.println("Error setting the CID");
    }
    }
    else
    {
    mySerial.println("Error initializating");
    }

    sendATcommand("AT+HTTPTERM", "OK", 5000);

    delay(5000);

    }

    void power_on(){

    uint8_t answer=0;

    // checks if the module is started
    answer = sendATcommand("AT", "OK", 2000);
    if (answer == 0)
    {
    // power on pulse
    digitalWrite(onModulePin,HIGH);
    delay(3000);
    digitalWrite(onModulePin,LOW);

    // waits for an answer from the module
    while(answer == 0){
    // Send AT every two seconds and wait for the answer
    answer = sendATcommand("AT", "OK", 2000);
    }
    }

    }


    int8_t sendATcommand(char* ATcommand, char* expected_answer1, unsigned int timeout){

    uint8_t x=0, answer=0;
    char response[100];
    unsigned long previous;

    memset(response, '\0', 100); // Initialize the string

    delay(100);

    while( mySerial.available() > 0) mySerial.read(); // Clean the input buffer

    mySerial.println(ATcommand); // Send the AT command


    x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
    if(mySerial.available() != 0){
    response[x] = mySerial.read();
    x++;
    // check if the desired answer is in the response of the module
    if (strstr(response, expected_answer1) != NULL)
    {
    answer = 1;
    }
    }
    // Waits for the asnwer with time out
    }
    while((answer == 0) && ((millis() - previous) < timeout));

    return answer;
    }

     

    int8_t sendATcommand2(char* ATcommand, char* expected_answer1,
    char* expected_answer2, unsigned int timeout){

    uint8_t x=0, answer=0;
    char response[100];
    unsigned long previous;

    memset(response, '\0', 100); // Initialize the string

    delay(100);

    while( mySerial.available() > 0) mySerial.read(); // Clean the input buffer

    mySerial.println(ATcommand); // Send the AT command


    x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
    if(mySerial.available() != 0){
    response[x] = mySerial.read();
    x++;
    // check if the desired answer 1 is in the response of the module
    if (strstr(response, expected_answer1) != NULL)
    {
    answer = 1;
    }
    // check if the desired answer 2 is in the response of the module
    if (strstr(response, expected_answer2) != NULL)
    {
    answer = 2;
    }
    }
    // Waits for the asnwer with time out
    }while((answer == 0) && ((millis() - previous) < timeout));

    return answer;
    }

    Posted by Dipti Divakar on Tuesday, 16 December 2014
Posted by GAurav, Monday, 12 September 2016 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Dear Sir,

    Kindly load below code to the Arrduino board.

    SAMPLE CODE:

    void setup()
    {
    Serial.begin(9600);
    delay(5000);

    }

    void loop()
    {
    Serial.println("AT");
    delay(1000);
    Serial.println("AT+CMGF=1");
    delay(1000);
    Serial.println("AT+CMGS=\"1234567890\""); //CHANGE TO DESTINATION NUMBER
    delay(1000);
    Serial.print("hi");
    Serial.write(26);
    delay(1000);
    }

    Posted by Vikhitha Shetty on Monday, 12 September 2016
  • 0
    vote
    A:

    Dear Sir,

    Kindly load below code to the Arrduino board.

    SAMPLE CODE:

    void setup()
    {
    Serial.begin(9600);
    delay(5000);

    }

    void loop()
    {
    Serial.println("AT");
    delay(1000);
    Serial.println("AT+CMGF=1");
    delay(1000);
    Serial.println("AT+CMGS=\"1234567890\""); //CHANGE TO DESTINATION NUMBER
    delay(1000);
    Serial.print("hi");
    Serial.write(26);
    delay(1000);
    }

    Posted by Vikhitha Shetty on Monday, 12 September 2016
Posted by aman goel, Tuesday, 14 June 2016 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Kindly click on the below link for the code.

    http://researchdesignlab.com/rdl_gsm_gprs_code.html

    Posted by Raghavendra Shetty on Tuesday, 14 June 2016
Posted by rk singh, Saturday, 14 November 2015 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    You have to give external power supply to Arduino uno. We will provide you the sample code.

    Posted by Admin Admin on Saturday, 14 November 2015
Posted by micheal, Saturday, 22 August 2015 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Dear Customer

    Please find the code below, also the same code can be used to on/off the pump.


    int8_t answer;
    int x;

    char SMS[200];

    void setup(){

     
        Serial.begin(9600);  

        pinMode(8, OUTPUT);
                digitalWrite(8, LOW);
        power_on();
            // turn the LED on (HIGH is the voltage level)
      delay(1000);              // wait for a second


     Serial.println("Network...");
         while( (sendATcommand("AT+CREG?", "+CREG: 0,1", 500) ||
                sendATcommand("AT+CREG?", "+CREG: 0,5", 500)) == 0 );
                
    delay(300);
    //Signal();
     
        
        Serial.println("Setting SMS mode...");
        sendATcommand("AT+CMGF=1", "OK", 1000);    // sets the SMS mode to text
        delay(300);
         
      sendATcommand("AT+CMGD=1", "OK", 1000);
      Serial.println("SEND SMS... TO READ");
    }


    void loop(){
       answer = sendATcommand("AT+CMGR=1", "+CMGR:", 2000);    // reads the first SMS
        if (answer == 1)
      {x=0;
            memset(SMS, '\0', 100);
            answer = 0;
            while(Serial.available() == 0);
            // this loop reads the data of the SMS
            do{
                // if there are data in the UART input buffer, reads it and checks for the asnwer
                if(Serial.available() > 0){
               
              
                    SMS[x] = Serial.read();
                    x++;
                    // check if the desired answer (OK) is in the response of the module
                 
                    
                     if (strstr(SMS, "PUMP ON") != NULL)    
                    {
                      digitalWrite(8, HIGH);
                         answer = 1;
                    }
                    
                      if (strstr(SMS, "PUMP OFF") != NULL)    
                    {
                       digitalWrite(8, LOW);
                          answer = 1;
                    }
                       if (strstr(SMS, "OK") != NULL)    
                    {
                        answer = 1;
                    }
                    
                }
            }while(answer == 0);    // Waits for the asnwer with time out
            
            
            SMS[x] = '\0';
                   Serial.print(SMS);   
              delay(200);
            sendATcommand("AT+CMGD=1", "OK", 1000);   
                     delay(100);
                     sendATcommand("AT+CMGD=1,4", "OK", 1000);
                           delay(200);
                    

        }
       
        delay(1000);
     
    }

    void power_on(){

        uint8_t answer=0;
        
        // checks if the module is started
        answer = sendATcommand("AT", "OK", 2000);
        if (answer == 0)
        {
            
        
            // waits for an answer from the module
            while(answer == 0){     // Send AT every two seconds and wait for the answer
                answer = sendATcommand("AT", "OK", 2000);    
            }
        }
        
    }

    int8_t sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout){

        uint8_t x=0,  answer=0;
        char response[100];
        unsigned long previous;

        memset(response, '\0', 100);    // Initialice the string

        delay(100);

        while( Serial.available() > 0) Serial.read();    // Clean the input buffer

        Serial.println(ATcommand);    // Send the AT command


            x = 0;
        previous = millis();

        // this loop waits for the answer
        do{
            // if there are data in the UART input buffer, reads it and checks for the asnwer
            if(Serial.available() != 0){    
                response[x] = Serial.read();
                x++;
                // check if the desired answer is in the response of the module
                if (strstr(response, expected_answer) != NULL)    
                {
                    answer = 1;
                }
            }
            // Waits for the asnwer with time out
        }while((answer == 0) && ((millis() - previous) < timeout));    

        return answer;
    }


    void Signal()
    {
    answer = sendATcommand("AT+CSQ", "+CSQ", 2000);    // reads the first SMS
         
        if (answer == 1)
        {x=0;
            memset(SMS, '\0', 300);
            answer = 0;
            while(Serial.available() == 0);
            // this loop reads the data of the SMS
            do{
                // if there are data in the UART input buffer, reads it and checks for the asnwer
                if(Serial.available() > 0){    
                    SMS[x] = Serial.read();
                    x++;
           
                    if (strstr(SMS, "OK") != NULL)    
                    {
                        answer = 1;
                    }
                }
            }while(answer == 0);    // Waits for the asnwer with time out
            
            
            SMS[x] = '\0';
             Serial.println(SMS);
             
                   delay(100);
        }
        
    }

    Posted by Rashmi P on Saturday, 22 August 2015
Posted by chiradeep, Wednesday, 15 July 2015 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Dear Sir,

    HTTPS is not supported by sim900a modems. It supports FTP/HTTP.

    Posted by Dipti Divakar on Wednesday, 15 July 2015
Posted by Thalsib, Thursday, 22 January 2015 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Please go throught the below image for your query, 

     

    Posted by Dipti Divakar on Thursday, 22 January 2015
Posted by ganapati, Monday, 29 December 2014 on product GSM GPRS SIM900A Modem- Arduino Compatible
  • 0
    vote
    A:

    Dear Sir

    Kindly go through the below links and the difference between the modems,

    1. http://researchdesignlab.com/gsm-gprs-sim900a-modem-compatible-for-arduino.html

    RDL/RGS/14/001/V1.0 -> This is a simple arduino shield which gets mounted on top or any arduino uno or arduino uno clone boards. Needs an adapter of 12V,2A to turn on this modem plugged into arduino uno DC socket. Other arduino shields could be mounted on top of this. No audio/mic jack are present on board.

    2.http://researchdesignlab.com/gsm-modem-arduino-compatible.html

    RDL/GSM-A/14/14/001/V3.0 -> This is a simple arduino shield which gets mounted on top or any arduino uno or arduino uno clone boards. Needs an adapter of 12V,2A to turn on this modem plugged into arduino uno DC socket. Other arduino shields can not mounted on top of this. Audio/mic jack are present on board.

    3. http://researchdesignlab.com/gsm-gprs-shield.html

    RDL/GSM-GPRS/14/001/V3.0 , -> is an industrial standard grade product with current controlling IC on board. This is also an arduino shield which gets mounted on top or any arduino uno or arduino uno clone boards. No need of external power supply for the arduino board.(USB power is enough). This has got inbuilt DC to DC converter.

    Posted by Dipti Divakar on Monday, 29 December 2014

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