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Topic: door opening with arduino and SIM900 (Read 4575 times) previous topic - next topic


hi :)
I am a student in France, and am currently working on a project to open the door remotely. Specifically with sending a sms.
I have una map R3 + arduino shield a GPRS "SIM900" (seeestudio) + a servo motor.
The problem is that I do not know what software to use with this shield, do I stay in arduino or sscom32E or AT command test?
I want a program that hen I send a sms as "open" drives the servo motor 90 and "close" the furnish to its starting position.
Thank you for your help


To interface with the SIM900, will require the at commands http://www.simcom.us/act_admin/supportfile/SIM900_ATC_V1.00.pdf, to read the text message you can use the command AT+CMGR, and serialRead to get the reply. To control the servo use the servo library (http://arduino.cc/en/Reference/Servo) and an 'if' statement on the read serial data.
I got a sim900 module last September but have not got round to using it extensively yet, (maybe summer). Here is blog which details use of a TC35 gsm modem, which uses most of the same commands as the sim900, http://denhart.dk/2012/01/21/siemens-tc35-gsm-module-arduino/. Hope this helps.


thank you very much :) But "siemens TC35 Module" is a software ? where can i download ?
And i have 2 little code but i don't know where include "servo"

#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8);

// FR: Mémoire tampon de type string pour les messages du shield GPRS
String msg = String("");
// FR: Est mis à 1 quand le prochain message du shield GPRS contiendra le contenu du SMS
int SmsContentFlag = 0;

// FR: Pin de la LED a allumer/éteindre en fonction du message reçu
int ledPin = 13;

// FR: Code PIN de la carte SIM (si applicable)
String SIM_PIN_CODE = String( "XXXX" );

void setup()
  mySerial.begin(19200);               // the GPRS baud rate   
  Serial.begin(19200);                 // the GPRS baud rate

  // Initialize la PIN
  pinMode( ledPin, OUTPUT );
  digitalWrite( ledPin, LOW );

void loop()
    char SerialInByte;
       mySerial.print((unsigned char)Serial.read());
    else  if(mySerial.available())
        char SerialInByte;
        SerialInByte = (unsigned char)mySerial.read();
        // FR: Relayer l'information vers le moniteur Serie Arduino
        Serial.print( SerialInByte );
        // -------------------------------------------------------------------
        // FR: Le programme écoute également les messages issus du GPRS Shield.
        // -------------------------------------------------------------------
        // FR: Si le message se termine par un <CR> alors traiter le message
        if( SerialInByte == 13 ){
          // EN: Store the char into the message buffer
          // FR: Stocké le caractère dans le buffer de message
         if( SerialInByte == 10 ){
            // EN: Skip Line feed
            // FR: Ignorer les Line Feed
         else {
           // EN: store the current character in the message string buffer
           // FR: stocker le caractère dans la mémoire tampon réservé au message
           msg += String(SerialInByte);
// FR: Execute une action sur base du contenu d'un SMS.
//     Notez que le contenu du SMS est le résultat du traitement de plusieurs messages du shield GPRS.
void ProcessSms( String sms ){
  Serial.print( "ProcessSms for [" );
  Serial.print( sms );
  Serial.println( "]" );
  if( sms.indexOf("on") >= 0 ){
    digitalWrite( ledPin, HIGH );
    Serial.println( "LED IS ON" );
  if( sms.indexOf("off") >= 0 ){
    digitalWrite( ledPin, LOW );
    Serial.println( "LED IS OFF" );

// FR: Envoyer le code PIN de la carte SIM au shield GRPS
void GprsSendPinCode(){
  if( SIM_PIN_CODE.indexOf("XXXX")>=0 ){
    Serial.println( "*** OUPS! you did not have provided a PIN CODE for your SIM CARD. ***" );
    Serial.println( "*** Please, define the SIM_PIN_CODE variable . ***" );
  mySerial.println( SIM_PIN_CODE );

// FR: Demande d'utiliser le mode Text pour la gestion des messages
void GprsTextModeSMS(){
  mySerial.println( "AT+CMGF=1" );

void GprsReadSmsStore( String SmsStorePos ){
  // Serial.print( "GprsReadSmsStore for storePos " );
  // Serial.println( SmsStorePos );
  mySerial.print( "AT+CMGR=" );
  mySerial.println( SmsStorePos );

// FR: efface le contenu de la mémoire tampon des messages du GPRS shield.
void ClearGprsMsg(){
  msg = "";

// FR: interprete le message du GPRS shield et agit en conséquence
void ProcessGprsMsg() {
  Serial.print( "GPRS Message: [" );
  Serial.print( msg );
  Serial.println( "]" );
  if( msg.indexOf( "+CPIN: SIM PIN" ) >= 0 ){
     Serial.println( "*** NEED FOR SIM PIN CODE ***" );
     Serial.println( "PIN CODE *** WILL BE SEND NOW" );

  if( msg.indexOf( "Call Ready" ) >= 0 ){
     Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
  // FR: Message non sollicité quand un SMS arrive
  if( msg.indexOf( "+CMTI" ) >= 0 ){
     Serial.println( "*** SMS Received ***" );
     // FR: Rechercher la position de la virgule dans le message complet (+CMTI: "SM",6)
     //     Dans l'exemple, le SMS est stocké à la position 6
     int iPos = msg.indexOf( "," );
     String SmsStorePos = msg.substring( iPos+1 );
     Serial.print( "SMS stored at " );
     Serial.println( SmsStorePos );

     // FR: Demande de lecture du stockage SMS
     GprsReadSmsStore( SmsStorePos );
  // FR: Lecture du stockage SMS via l'UART (résultat de la requete GprsReadSmsStore)
  if( msg.indexOf( "+CMGR:" ) >= 0 ){
    // FR: Le prochain message contiendra le contenu du SMS
    SmsContentFlag = 1;
    // FR: Les ligne suivantes sont essentielle pour ne pas effacer le flag!
  //     (this message) will contains the SMS body
  // FR: le message +CMGR précédent indiquait que le message suivant du Shield GPRS
  //     (ce message) contient le corps du SMS
  if( SmsContentFlag == 1 ){
    Serial.println( "*** SMS MESSAGE CONTENT ***" );
    Serial.println( msg );
    Serial.println( "*** END OF SMS MESSAGE ***" );
    ProcessSms( msg );
  // FR: Toujours mettre le flag à 0
  SmsContentFlag = 0;


setup() {
  Serial.write("AT+CMGF=1"); //Use text mode for sms


loop() {
  Serial.write("AT+CMGL=\"ALL\"\r\n"); //Check which AT commands that will send you the first sms in the sms memory. If there is none you will get an error, but that is ok.
  delay(1000); //Wait for modem to send response
  a = Serial.read(); //Read the modem response
  if ( a.find("off") ) //If off is anywhere in modem response,
     servo(0);   //move servo to zero degrees
  if (a.find("90") ) //If 90 is anywhere in response
     servo(90);  /Move servo to zero degrees
  Serial.write("AT+yyyyy\r\n"); //Check which AT commands delete the first sms
  delay(1000); //Wait for modem response
  Serial.read(); //Read and throw away modem response

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