Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» GPRS SIM928A 08: Sending SMS

This example shows how to send a SMS

Required Materials

1 x Waspmote
1 x Battery
1 x GPRS_SIM928A module
1 x GPRS/3G antenna
1 x SIM card


- GPRS_SIM928 module must be powered with a battery
- When GPRS_SIM928 is in use, interrupts can't be used
- This example can be executed in Waspmote v12 and Waspmote v15


 *  ------  GPRS_SIM928A_08 - Sending SMS  -------- 
 *  Explanation: This example shows how to send a SMS.
 *  Copyright (C) 2015 Libelium Comunicaciones Distribuidas S.L. 
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  GNU General Public License for more details. 
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see <>. 
 *  Version:           0.1
 *  Design:            David Gascón 
 *  Implementation:    Alejandro Gállego

#include "WaspGPRS_SIM928A.h"
int answer;

char text_message[]="This is a test message from Waspmote!";

void setup()
    // setup for Serial port over USB:
    USB.println(F("USB port started..."));

    // 1. activates the GPRS_SIM928A module:
    answer = GPRS_SIM928A.ON(); 
    if ((answer == 1) || (answer == -3))
        USB.println(F("GPRS_SIM928A module ready..."));
        // 2. sets pin code
        USB.println(F("Setting PIN code..."));
        // **** must be substituted by the SIM code
        if (GPRS_SIM928A.setPIN("****") == 1) 
            USB.println(F("PIN code accepted"));
            USB.println(F("PIN code incorrect"));
        // 3. waits for connection to the network
        answer = GPRS_SIM928A.check(180);    
        if (answer == 1)
            USB.println(F("GPRS_SIM928A module connected to the network..."));
            // ********* should be replaced by the desired tlfn number
            // 4. sends an SMS
            if (GPRS_SIM928A.sendSMS(text_message,"*********") == 1) 
                USB.println(F("SMS Sent OK")); 
                USB.println(F("Error sending SMS"));   
            USB.println(F("GPRS_SIM928A module cannot connect to the network..."));
        USB.println(F("GPRS_SIM928A module NOT ready..."));


void loop()



USB port started...
GPRS_SIM928A module ready...
Setting PIN code...
PIN code accepted
GPRS_SIM928A module connected to the network...
SMS sent OK

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