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GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB

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GSM/GPRS Modem - RS232 is built with Dual Band GSM/GPRS engine - SIM900A, works on frequencies 900/1800 Mhz. The Modem comes with RS232 interface, which allows the user to connect PC as well as microcontroller with RS232 Chip(MAX232). The baud rate is configurable from 9600 - 115200 through AT command. The GSM/GPRS Modem is having internal TCP/IP stack to enable the user to connect with internet via GPRS. It is suitable for sending SMS, Voice as well as DATA transfer application in M2M interface. The onboard Regulated Power supply allows the user to connect wide range of unregulated power supply. Using this modem, user can make audio calls, sending SMS, Reading SMS, attend the incoming calls and internet etc., through simple AT commands.

Order Code : RDL/UGSM/14/001/V1.0

SIM900A Module is Outdated and updated vesrion of the module given below link.

GSM GPRS SIM800C

Availability: Out of stock

₹1,677.00
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Questions:

Posted by MANOJ CM, Wednesday, 31 August 2016 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear Sir/Madam,

    Kindly click below link for sample sdk code, which will help you in sending and receiving sms using VB.net Windows application.

    http://researchdesignlab.com/projects/GSM%20SDK.zip

    Posted by Vikhitha Shetty on Wednesday, 31 August 2016
Posted by puneeth g n, Wednesday, 4 November 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear sir,

    Minimum current rating should be 12V 2Amps.

    Posted by Admin Admin on Wednesday, 4 November 2015
Posted by suzel, Saturday, 22 August 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 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 module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear Mr.Chiradeep

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

    Posted by Dipti Divakar on Wednesday, 15 July 2015
Posted by RAHUL M R, Thursday, 2 July 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear Rahul

    Remove the jumper from power key and ground, and connect it to data pin. 

    Posted by Dipti Divakar on Thursday, 2 July 2015
Posted by Rajan, Monday, 11 May 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear Mr.Rajan

    Please click on the below link for the Driver installation,

    http://www.ftdichip.com/Drivers/VCP.htm

    Posted by Rashmi P on Monday, 11 May 2015
Posted by vikranth, Friday, 13 March 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Please go through the below Image to know how to interface with Ardiuno ,



    Posted by Dipti Divakar on Friday, 13 March 2015
Posted by ramesh, Friday, 13 March 2015 on product GSM GPRS SIM900A module with Stub Antenna and SMA connector-USB
  • 0
    vote
    A:

    Dear Ramesh,

    Please find the code below,

    One way to get current time is by sending a message to itself. Below is an example:

    AT+CMGF=1 
    AT+CSCS="GSM" 
    AT+CMGS="0123456789" your phone number
    THIS IS TEST test message
    ...
    ...
    +CMTI: "SM",1 recevied a message at index:1
    ...
    ...
    AT+CMGR=1
    +CMGR: "REC UNREAD","0123456789","","14/11/15,15:03:13+22" got current time
    THIS IS TEST

    Sync your SIM900 with current time by
    AT+CCLK="14/11/15,15:06:45+22"


    Note : if you do not want to send an sms and resync the time ,you also use GPRs technique with your own website time or ntp server time

    Posted by Dipti Divakar on Friday, 13 March 2015

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