I have a GBoard which contains a SIM900 GSM/GPRS module, a XBEE Shield and an SD Card Slot.
This is the link of the GBoard product.
I want the Arduino to send and receive SMS on the SIM900 module. To be specific, I want to read SMS mostly, and take some action based on the content of the SMS and then delete it from the SIM card.
How do I accomplish that?
Here's what I have working to turn an LED on/off via SMS. You might need to adjust the code for you setup.
#include <SoftwareSerial.h>
SoftwareSerial mySerial(7, 8);
// EN: String buffer for the GPRS shield message
// FR: Mémoire tampon de type string pour les messages du shield GPRS
String SmsStorePos = String("");
String msg = String("");
String snTmp = String("");
String snFull = String("");
// EN: Set to 1 when the next GPRS shield message will contains the SMS message
// FR: Est mis à 1 quand le prochain message du shield GPRS contiendra le contenu du SMS
int SmsContentFlag = 0;
// EN: Pin of the LED to turn ON and OFF depending on the received message
// FR: Pin de la LED a allumer/éteindre en fonction du message reçu
int ledPin = 5;
void setup()
{
mySerial.begin(19200); // the GPRS baud rate
mySerial.print("\r");
delay(1000);
Serial.begin(19200); // the GPRS baud rate
Serial.println("Started!");
pinMode( ledPin, OUTPUT );
digitalWrite( ledPin, LOW );
}
void loop()
{
char SerialInByte;
if(Serial.available())
{
mySerial.print((unsigned char)Serial.read());
}
else if(mySerial.available())
{
char SerialInByte;
SerialInByte = (unsigned char)mySerial.read();
// EN: Relay to Arduino IDE Monitor
// FR: Relayer l'information vers le moniteur Serie Arduino
Serial.print( SerialInByte );
// -------------------------------------------------------------------
// EN: Program also listen to the GPRS shield message.
// FR: Le programme écoute également les messages issus du GPRS Shield.
// -------------------------------------------------------------------
// EN: If the message ends with <CR> then process the message
// 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
ProcessGprsMsg();
}
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);
}
}
}
// EN: Make action based on the content of the SMS.
// Notice than SMS content is the result of the processing of several GPRS shield messages.
// 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 ){
sms.toLowerCase();
Serial.print( "ProcessSms for [" );
Serial.print( sms );
Serial.println( "]" );
if( sms.indexOf("on") >= 0 ){
digitalWrite( ledPin, HIGH );
Serial.println( "LED IS ON" );
return;
}
if( sms.indexOf("off") >= 0 ){
digitalWrite( ledPin, LOW );
Serial.println( "LED IS OFF" );
return;
} else {
mySerial.print("AT+CMGF=1\r"); //Because we want to send the SMS in text mode
delay(1000);
mySerial.print("AT+CMGS=\"");
mySerial.print(snFull);
mySerial.print("\"\r");
delay(1000);
mySerial.print("Unknown Command: ");
mySerial.print(sms);
mySerial.print("\r");
delay(1000);
mySerial.write(0x1A); //Equivalent to sending Ctrl+Z
return;
}
}
// EN: Request Text Mode for SMS messaging
// 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 );
}
// EN: Clear the GPRS shield message buffer
// FR: efface le contenu de la mémoire tampon des messages du GPRS shield.
void ClearGprsMsg(){
msg = "";
}
// EN: interpret the GPRS shield message and act appropiately
// FR: interprete le message du GPRS shield et agit en conséquence
void ProcessGprsMsg() {
Serial.println("");
Serial.print( "GPRS Message: [" );
Serial.print( msg );
Serial.println( "]" );
if( msg.indexOf( "Call Ready" ) >= 0 ){
Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
GprsTextModeSMS();
}
// EN: unsolicited message received when getting a SMS message
// FR: Message non sollicité quand un SMS arrive
if( msg.indexOf( "+CMTI" ) >= 0 ){
Serial.println( "*** SMS Received ***" );
// EN: Look for the coma in the full message (+CMTI: "SM",6)
// In the sample, the SMS is stored at position 6
// 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( "," );
SmsStorePos = msg.substring( iPos+1 );
Serial.print( "SMS stored at " );
Serial.println( SmsStorePos );
// EN: Ask to read the SMS store
// FR: Demande de lecture du stockage SMS
GprsReadSmsStore( SmsStorePos );
}
// EN: SMS store readed through UART (result of GprsReadSmsStore request)
// FR: Lecture du stockage SMS via l'UART (résultat de la requete GprsReadSmsStore)
if( msg.indexOf( "+CMGR:" ) >= 0 ){
// get number of sender
int snPos = msg.indexOf("+1");
Serial.print("SMS From: ");
snTmp = msg.substring(snPos+1);
snFull = "";
for (int i = 0; i < 11; i++){
snFull += snTmp[i];
}
Serial.println(snFull);
// EN: Next message will contains the BODY of SMS
// FR: Le prochain message contiendra le contenu du SMS
SmsContentFlag = 1;
// EN: Following lines are essentiel to not clear the flag!
// FR: Les ligne suivantes sont essentielle pour ne pas effacer le flag!
ClearGprsMsg();
return;
}
// EN: +CMGR message just before indicate that the following GRPS Shield message
// (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 );
delSMS();
}
ClearGprsMsg();
// EN: Always clear the flag
// FR: Toujours mettre le flag à 0
SmsContentFlag = 0;
}
void delSMS() {
mySerial.print("AT+CMGD=");
mySerial.println(SmsStorePos);
}