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/*
 SMS receiver


 This sketch, for the Arduino GSM shield, waits for a SMS message
 and displays it through the Serial port.


 Circuit:
 * GSM shield attached to and Arduino
 * SIM card that can receive SMS messages


 created 25 Feb 2012
 by Javier Zorzano / TD


 This example is in the public domain.


 http://www.arduino.cc/en/Tutorial/GSMExamplesReceiveSMS


*/


// include the GSM library
#include <GSM.h>


// PIN Number for the SIM
#define PINNUMBER ""


// initialize the library instances
GSM gsmAccess;
GSM_SMS sms;


// Array to hold the number a SMS is retreived from
char senderNumber[20];


void setup() {
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.println("SMS Messages Receiver");


  // connection state
  boolean notConnected = true;


  // Start GSM connection
  while (notConnected) {
    if (gsmAccess.begin(PINNUMBER) == GSM_READY) {
      notConnected = false;
    } else {
      Serial.println("Not connected");
      delay(1000);
    }
  }


  Serial.println("GSM initialized");
  Serial.println("Waiting for messages");
}


void loop() {
  char c;


  // If there are any SMSs available()
  if (sms.available()) {
    Serial.println("Message received from:");


    // Get remote number
    sms.remoteNumber(senderNumber, 20);
    Serial.println(senderNumber);


    // An example of message disposal
    // Any messages starting with # should be discarded
    if (sms.peek() == '#') {
      Serial.println("Discarded SMS");
      sms.flush();
    }


    // Read message bytes and print them
    while (c = sms.read()) {
      Serial.print(c);
    }


    Serial.println("\nEND OF MESSAGE");


    // Delete message from modem memory
    sms.flush();
    Serial.println("MESSAGE DELETED");
  }


  delay(1000);


}

اگه بخواید برای ماژول های GSM غیر اورجینال استفاده کنید باید یه سری تغییرات بدید که اگر در کدنویسی وارد نیستید بهتره برید سراغ کدهای ساده تر
مثلا این کد:

 


// EN: String buffer for the GPRS shield message
String msg = String("");
// EN: Set to 1 when the next GPRS shield message will contains the SMS message
int SmsContentFlag = 0;
//control pins of relay.
int relay_a=4;
int relay_b=5;
int relay_c=6;
int relay_d=7;


// EN: Code PIN of the SIM card (if applied)
//String SIM_PIN_CODE = String( "XXXX" );
 
void setup()
{
  Serial.begin(19200);                 // the GPRS baud rate
  // Initialize  PINs
  pinMode( 4, OUTPUT ); 
  pinMode( 5, OUTPUT ); 
  pinMode( 6, OUTPUT ); 
  pinMode( 7, OUTPUT ); 
  digitalWrite( 4, LOW ); 
  digitalWrite( 5, LOW ); 
  digitalWrite( 6, LOW );
  digitalWrite( 7, LOW );
 Serial.println( "AT+CMGF=1" ); 
 delay(200);
}
 
void loop()
{
    char SerialInByte;
    if(Serial.available())
    {       
        SerialInByte = (unsigned char)Serial.read();
       delay(5);
        
        // -------------------------------------------------------------------
        // EN: Program also listen to the GPRS shield message.
        // -------------------------------------------------------------------
       // EN: If the message ends with <CR> then process the message
        if( SerialInByte == 13 ){
          // EN: Store the char into the message buffer
          ProcessGprsMsg();
         }
         if( SerialInByte == 10 ){
            // EN: Skip Line feed
         }
         else {
           // EN: store the current character in the message string buffer
           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.
void ProcessSms( String sms ){
  
  if( sms.indexOf("ona") >= 0 ){
    digitalWrite( relay_a, HIGH );
  }
   if( sms.indexOf("onb") >= 0 ){
    digitalWrite(  relay_b, HIGH );
  }
   if( sms.indexOf("onc") >= 0 ){
    digitalWrite(  relay_c, HIGH );
  }
  if( sms.indexOf("ond") >= 0 ){
    digitalWrite(  relay_d, HIGH );
  }
  if( sms.indexOf("offa") >= 0 ){
    digitalWrite(  relay_a, LOW );
  }
  if( sms.indexOf("offb") >= 0 ){
    digitalWrite(  relay_b, LOW );
  }
  if( sms.indexOf("offc") >= 0 ){
    digitalWrite(  relay_c, LOW );
  }
  if( sms.indexOf("offd") >= 0 ){
    digitalWrite(  relay_d, LOW );
  }
}
// EN: Request Text Mode for SMS messaging
void GprsTextModeSMS(){
  Serial.println( "AT+CMGF=1" );
}


void GprsReadSmsStore( String SmsStorePos ){
  Serial.print( "AT+CMGR=" );
  Serial.println( SmsStorePos );
}


// EN: Clear the GPRS shield message buffer
void ClearGprsMsg(){
  msg = "";
}


// EN: interpret the GPRS shield message and act appropiately
void ProcessGprsMsg() {
  if( msg.indexOf( "Call Ready" ) >= 0 ){
   //  Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
     GprsTextModeSMS();
  }
  
  // EN: unsolicited message received when getting a SMS message
  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
     int iPos = msg.indexOf( "," );
     String SmsStorePos = msg.substring( iPos+1 );
   //  Serial.print( "SMS stored at " );
  //   Serial.println( SmsStorePos );     
     // EN: Ask to read the SMS store
     GprsReadSmsStore( SmsStorePos );
  }
  
  // EN: SMS store readed through UART (result of GprsReadSmsStore request)  
  if( msg.indexOf( "+CMGR:" ) >= 0 ){
    // EN: Next message will contains the BODY of SMS
    SmsContentFlag = 1;
    // EN: Following lines are essentiel to not clear the flag!
    ClearGprsMsg();
    return;
  }
  
  // EN: +CMGR message just before indicate that the following GRPS Shield message 
  //     (this message) will contains the SMS body 
  if( SmsContentFlag == 1 ){
 //   Serial.println( "*** SMS MESSAGE CONTENT ***" );
 //   Serial.println( msg );
 //   Serial.println( "*** END OF SMS MESSAGE ***" );
    ProcessSms( msg );
  }
  
  ClearGprsMsg();
  // EN: Always clear the flag
  SmsContentFlag = 0; 
}

این کد یه نمونه هست که میاد بر اساس sms دریافتی چهار تا رله رو فعال / غیر فعال می کنه