GSM module to 8051 microcontroller

Hassan Gazal · Jul 25, 2013

Dear , All

I need to connect Microcontroller 8051 with GSM modem, and send AT commands through 8051.

I did it before , but using a very expensive GSM modem .

so if there is any way to build a small Circuit GSM modem.

Thanks

g_shyam1682 · Jul 25, 2013

Hi,

You can use SIMCOM900A GSM module easily available in market. Connect module directly with 8051 on UART and its work fine.

Regards,

sanket.joshi · Jul 25, 2013

it will be difficult to do that....
i think price of GSM module is Rs1500....
according to me it will be efficient to use GSM module....
sim300 module also works fine through UART OF 8051..

g_shyam1682 · Jul 25, 2013

Hi,

In Mumbai - India, Simcom900A can get just in Rs 700/-.
Antenna with Screw - Rs 150/-
Sim holder - Rs 20/-

Regards,

Hassan Gazal · Jul 26, 2013

Thanks for you all
im in egypt but i can not find it here , so if any website to buy it and chip to egypt , i need a cheap one.

bigdogguru · Jul 26, 2013

eBay has both the SIM300 and SIM900 at good prices:

eBay Search SIM300 or SIM900

Several of the vendors on eBay have their own websites as well.

BigDog

Hassan Gazal · Jul 26, 2013

Thanks bigdogguru

can you please check this one and tell me if it's suitable to interface it with 8051 and send AT commands .

**broken link removed**

can you please check also this one it's cheap than the other one , if it is also suitable for me

https://www.sainsmart.com/siemens-tc35-sms-gsm-module-voice-adapter.html

sorry , these modules can send sms for long distance , i mean our mobiles using GSM and you can send a sms to your friend in another city or another country , so these ,modules can do it ???

bigdogguru · Jul 26, 2013

Hassan Gazal said:
can you please check this one and tell me if it's suitable to interface it with 8051 and send AT commands .

**broken link removed**

can you please check also this one it's cheap than the other one , if it is also suitable for me

https://www.sainsmart.com/siemens-tc35-sms-gsm-module-voice-adapter.html

sorry , these modules can send sms for long distance , i mean our mobiles using GSM and you can send a sms to your friend in another city or another country , so these ,modules can do it ???

Yes, both modules appear to be the same, capable of SMS and voice transmission and offer either UART TTL or RS-232 connections.

And the second link appears to be considerably less expensive.

https://www.sainsmart.com/siemens-tc35-sms-gsm-module-voice-adapter.html

It also has several downloadable files, including a few Arduino test sketches:

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An Arduino Leonardo
 
a GSM card Siemens TC 35
 
A transformer block 5v DC
 
Connections: It is necessary to connect the ground (GND) of the TC35 card to the mass of the Arduino (yellow wire).
 
Then connect the TX port of the TC35 (green wire) to a digital port of the Arduino (here the port 9) card and connect the RX port of the TC35 (blue wire) to the digital port (here 10) map Arduino.
 
ATTENTION: the Leonardo card for RX harbor only pins 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI) can be used. The power of the TC35 should be 5v DC, positive focus. It is necessary to turn on the TC35 card by pressing the left button of the RS232 port, the red LED will flash slowly if everything is ok (valid SIM card)
 
SMS sending Test:
Note: The flow rate should be between 9600 Arduino and TC35, AT commands typed without space. The following program allows you to enter a message in the serial monitor then sends.
 
#include <SoftwareSerial.h>   
 
 #define rxPin 10  
 
 #define txPin 9  
 
 // set up a new serial port for Leonardo  
 
 SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);  
 
 char recu[150];   // Array for entering message  
 
 String message="";  //string we're sending  
 
 int i;   
 
 void setup()  
 
 {//--For Leonardo  
 
  Serial.begin(9600);  
 
  while (!Serial){   
 
    }  
 
 // set the data rate for the SoftwareSerial port  
 
  mySerial.begin(9600);  
 
   delay(5000);  
 
   Serial.println("Hello, tapez votre SMS en terminant par un point");  
 
 }  
 
 void loop()       
 
 {   
 
    i = 0 ;   
 
    while ( Serial.available()>0 )     
 
    {recu[i] = Serial.read();   
 
     message += recu[i];   
 
     i++;   
 
     //-- 46 is the Ascii code for "."   
 
     if (recu[i-1]==46)  
 
     {  
 
     Serial.println("Envoi du SMS...");  
 
     SendTextMessage();  
 
     ShowSerialData();  
 
     delay(1000);   
 
     Serial.println("\r"); //-- Carriage return  
 
     Serial.println("SMS parti !");   
 
     message="";  
 
     i=0;  
 
     }  
 
    }         
 
 }  
 
 ///SendTextMessage()  
 
 ///this function is to send a sms message  
 
 void SendTextMessage()  
 
 { mySerial.print("AT+CMGF=1\r");  //Because we want to send the SMS in text mode  
 
  delay(1000);  
 
  mySerial.print("AT+CMGS=\"+336xxxxxxxx\"\r");  
 
  delay(1000);  
 
  mySerial.println(message);  
 
  mySerial.print("\r");  
 
  delay(1000);  
 
  mySerial.println((char)26);//the ASCII code of the ctrl+z is 26  
 
  mySerial.println();  
 
 }  
 
 void ShowSerialData()  
 
 {  
 
  while(mySerial.available()!=0)  
 
   Serial.write(mySerial.read());  
 
 }  
 
Be careful to read the information from the card, it is necessary to change the size of the receive buffer in file SoftwareSerial.h line # define _SS_MAX_RX_BUFF 1024 / / RX buffer size (here we increased the buffer to 1k).
 
Example of sending commands to the card and read the result.
 
#include <SoftwareSerial.h> 
 
 SoftwareSerial mySerial(10, 9); 
 
 char recu[150];   // Array for entering message 
 
 int i;  
 
 String message=""; 
 
 void setup() 
 
 {//--For Leonardo 
 
  Serial.begin(9600); 
 
  while (!Serial){  
 
    } 
 
  mySerial.begin(9600);   
 
  delay(5000); 
 
  Serial.println("Started!"); 
 
  Serial.println("Hello, tapez votre commande en terminant par un point"); 
 
  //-- Choose SIM memory and show the SMS in MEMORY 
 
  //-> AT+CPMS="SM". //mySerial.println( "AT+CPMS=\"SM\"" ); 
 
  //-- Ask for all the SMS 
 
  //-> AT+CMGL="ALL".// mySerial.println( "AT+CMGL=\"ALL\"" ); 
 
  //-> AT+CMGR=2. // Read the 2nd message 
 
  //-> AT+CMGD=2. // Delete the 2nd message 
 
  //-> AT+CNMI=?. //-- Test received message 
 
 } 
 
 void loop() 
 
 {   
 
   i = 0 ;  
 
    while ( Serial.available()>0 )    
 
    {recu[i] = Serial.read();  
 
     if ((recu[i]!=46)&&(recu[i]!=13)&&(recu[i]!=10)) 
 
       message += char(recu[i]);  
 
     i++;  
 
     if (recu[i-1]==46) 
 
     { 
 
     Serial.println("Envoi de la commande ["+message+"]"); 
 
     SendCmdMessage();  
 
     ShowSerialData(); 
 
     Serial.println("Commande finie,tapez votre commande en terminant par un point");  
 
     message=""; 
 
     i=0; 
 
     } 
 
    }  
 
 } 
 
 void ShowSerialData() 
 
 { 
 
  while(mySerial.available()!=0) 
 
  { 
 
   Serial.print(char(mySerial.read())); 
 
  } 
 
 } 
 
 void SendCmdMessage() 
 
 { mySerial.println(message); 
 
  delay(1000); 
 
 } 
 
Lighting a LED upon receiving an SMS and erase the SMS:
 
#include <SoftwareSerial.h>  
 
 SoftwareSerial mySerial(10, 9);  
 
 char recu[150];   // Array for entering message  
 
 int i;   
 
 int dp=0;  
 
 char c;  
 
 String message="";  
 
 String cmd="";  
 
 String cReturn="";  
 
 int nReturn=0;  
 
 int nPremier=0;  
 
 //--Pin of the LED to turn ON and OFF   
 
 int ledPin = 5;  
 
 void setup()  
 
 {//--For Leonardo  
 
  Serial.begin(9600);  
 
  while (!Serial){   
 
    }  
 
  mySerial.begin(9600);    
 
  delay(5000);  
 
  Serial.println("Started!");  
 
  Serial.println("Hello, Pour commencer taper Envoyer");  
 
  message="AT+CPMS=\"SM\"";  
 
     Serial.println("Envoi de la commande ["+message+"]");  
 
     SendCmdMessage();   
 
     ShowSerialData();   
 
     Serial.println(nReturn);   
 
     nPremier=nReturn;  
 
      pinMode( ledPin, OUTPUT );   
 
  digitalWrite( ledPin, LOW);  
 
  //-- Choose SIM memory and show the SMS in MEMORY  
 
  //-> AT+CPMS="SM". //mySerial.println( "AT+CPMS=\"SM\"" );  
 
  //-- Ask for all the SMS  
 
  //-> AT+CMGL="ALL".// mySerial.println( "AT+CMGL=\"ALL\"" );  
 
  //-> AT+CMGR=2. // Read the 2nd message  
 
  //-> AT+CMGD=2. // Delete the 2nd message  
 
  //-> AT+CNMI=?. //-- Test received message  
 
 }  
 
 void loop()  
 
 {    
 
    while ( Serial.available()>0 )     
 
    { message="AT+CPMS=\"SM\"";  
 
     SendCmdMessage();   
 
     ShowSerialData();  
 
     Serial.print("Nombre de SMS : ");  
 
     Serial.println(char(nReturn+48));  
 
     if (nReturn>nPremier)  
 
       {Serial.println("Nouveau SMS !");  
 
        //nPremier=nReturn-1;  
 
        Serial.print(nReturn);  
 
        Serial.print(" ");  
 
        Serial.println(nPremier);  
 
        digitalWrite( ledPin, HIGH);   
 
        delay(1000);  
 
        //--Read the nReturn message  
 
        message="";  
 
        message=nReturn+message;  
 
        message="AT+CMGR="+message;  
 
        Serial.println("Envoi de la commande ["+message+"]");  
 
        SendCmdMessage();   
 
        ShowSmsData();  
 
        delay(1000);  
 
        //--Delete the nReturn message  
 
        message="";  
 
        message=nReturn+message;  
 
        message="AT+CMGD="+message;   
 
        Serial.println("Envoi de la commande ["+message+"]");  
 
        SendCmdMessage();   
 
        ShowSmsData();  
 
        message="";  
 
       delay(1000);  
 
       digitalWrite( ledPin, LOW);  
 
       }  
 
     }  
 
 }  
 
 void ShowSerialData()  
 
 { cReturn="";  
 
  while(mySerial.available()!=0)  
 
  {  
 
   //Serial.print(char(mySerial.read()));  
 
   c=char(mySerial.read());  
 
   switch(dp){  
 
   case 1 :  
 
       if (c==44)///-- Acii code for Comma  
 
          dp=2;  
 
       else  
 
          cmd+=c;  
 
       break;  
 
   case 2 :  
 
       if (cmd!="")  
 
        { cmd.trim();  
 
         //Serial.println("Mem SMS ["+cmd+"]");  
 
         cReturn=cmd;  
 
         if (cReturn.length()==1)  
 
           {c=cReturn.charAt(0);  
 
           nReturn=c-0;  
 
           nReturn=nReturn-48;}  
 
          else  
 
           nReturn=0;  
 
        }  
 
       dp=0;  
 
       cmd="";  
 
       break;  
 
   default :  
 
       if (c==58) //-- Acii code for :  
 
        dp=1;  
 
       break;  
 
  }  
 
  }  
 
 }  
 
 void ShowSmsData()  
 
 {  
 
  while(mySerial.available()!=0)  
 
  {  
 
   //Serial.print(char(mySerial.read()));  
 
   c=char(mySerial.read());  
 
   switch(dp){  
 
   case 1 :  
 
       if (c==13)///-- Acii code for Return  
 
          dp=2;  
 
       else  
 
          cmd+=c;  
 
       break;  
 
   case 2 :  
 
       if (cmd!="")  
 
        Serial.println("Mem SMS ["+cmd+"]");  
 
       dp=0;  
 
       cmd="";  
 
       break;  
 
   default :  
 
       if (c==58) //-- Acii code for :  
 
        dp=1;  
 
       break;  
 
  }  
 
  }  
 
 }  
 
 void SendCmdMessage()  
 
 { mySerial.println(message);  
 
  delay(1000);  
 
 }

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//////////////////////////////////////////////////////  
 
  // Delete all SMS in SIM Memory then :  
 
  // Wait for SMS, if SMS=OK Light PIN 5  
 
  // if SMS=OFF light off PIN 5  
 
  // if SMS=? give a status (ON or OFF) of PIN 5  
 
  // Otherwise return to the SMS sender a message  
 
  // If the AT command as an error light PIN 3  
 
  // If the AT command is ok light PIN 4  
 
  ///////////////////////////////////////////////////////  
 
  #include <SoftwareSerial.h>   
 
  SoftwareSerial mySerial(10, 9);   
 
  int dp=0;   
 
  int i=0;  
 
  int dpLed=0;   
 
  char c;   
 
  String message="";   
 
  String Res="";   
 
  String TxtSms="";  
 
  String NumSms="";  
 
  String cReturn="";   
 
  int nReturn=0;   
 
  int nPremier=0;   
 
  //--Pin of the LEDs    
 
  int ledPinRel = 5; //-- Led Action Or Relay  
 
  int ledPinOk = 4; //-- Led OK  
 
  int ledPinErr = 3; //-- Led Error  
 
  void setup()   
 
  {  
 
  mySerial.begin(9600);    
 
  delay(5000);   
 
  //-- SMS in text mode  
 
  message="AT+CMGF=1";  
 
  SendCmdMessage();  
 
  ShowSerialData();   
 
  //-- Print storage status  
 
  message="AT+CPMS=\"SM\"";   
 
  SendCmdMessage();    
 
  ExtractSmsNumber();    
 
  //--Delete all the SMS  
 
  for (i=nReturn; i>0; i--)   
 
    { message="";   
 
     message=i+message;   
 
     message="AT+CMGD="+message;     
 
     SendCmdMessage();   
 
     ShowSerialData();  
 
    }  
 
  //-- Print storage status  
 
  message="AT+CPMS=\"SM\"";   
 
  SendCmdMessage();    
 
  ExtractSmsNumber();   
 
  nPremier=nReturn;   
 
  //-- Initialize LED PIN  
 
  pinMode( ledPinRel, OUTPUT );    
 
  digitalWrite( ledPinRel, LOW);   
 
  pinMode( ledPinErr, OUTPUT );    
 
  digitalWrite( ledPinErr, LOW);   
 
  pinMode( ledPinOk, OUTPUT );    
 
  digitalWrite( ledPinOk, HIGH);   
 
  }  
 
  void loop()   
 
  {    
 
   message="AT+CPMS=\"SM\"";   
 
   SendCmdMessage();  
 
   ExtractSmsNumber();    
 
   dp=0;   
 
   if (nReturn>nPremier)   
 
     {//--Read the nReturn message   
 
     message="";   
 
     message=nReturn+message;   
 
     message="AT+CMGR="+message;   
 
     SendCmdMessage();    
 
     ShowSmsData();  
 
     if (TxtSms=="ON")   
 
       dp=1;  
 
     if (TxtSms=="OFF")  
 
       dp=2;  
 
     if (TxtSms=="?")  
 
       dp=3;        
 
     switch (dp) {  
 
      case 1 :  
 
          {digitalWrite( ledPinRel, HIGH);    
 
          dpLed=1;  
 
          break;}  
 
      case 2 :  
 
          {digitalWrite( ledPinRel, LOW);    
 
          dpLed=0;  
 
          break;}  
 
      case 3 :  
 
          {if (dpLed==1)  
 
             message="La LED est ON";  
 
             else  
 
             message="La LED est OFF";          
 
           SendSms();   
 
           message="AT+CMGD=1";     
 
           SendCmdMessage();    
 
           ShowSerialData();   
 
           break;   
 
           }   
 
       default :      
 
         {message="Erreur, tapez ON, OFF ou ?, merci !";  
 
          SendSms();  
 
          message="AT+CMGD=1";     
 
          SendCmdMessage();    
 
          ShowSerialData();  
 
          break;}  
 
     }  
 
     //--Delete the nReturn message  
 
     message="";   
 
     message=nReturn+message;   
 
     message="AT+CMGD="+message;     
 
     SendCmdMessage();    
 
     ShowSerialData();   
 
     delay(1000);  
 
     }    
 
  }   
 
  void ExtractSmsNumber()   
 
  {cReturn="";  
 
  Res="";  
 
  nReturn=1;  
 
  dp=0;   
 
  while(mySerial.available()!=0)   
 
  {   
 
   c=char(mySerial.read());   
 
   //if ((c!=13) && (c!=10))  
 
   //  Res+=c;  
 
   switch(dp){   
 
   case 1 :   
 
     if (c==44)///-- Acii code for Comma   
 
      dp=2;   
 
     else   
 
      Res+=c;   
 
     break;   
 
   case 2 :   
 
     if (Res!="")   
 
     { Res.trim();    
 
      cReturn=Res;   
 
      if (cReturn.length()==1)   
 
       {c=cReturn.charAt(0);   
 
       nReturn=c-0;   
 
       nReturn=nReturn-48;}   
 
      else   
 
       nReturn=0;   
 
     }   
 
     dp=0;   
 
     Res="";   
 
     break;   
 
   default :   
 
     if (c==58) //-- Acii code for :   
 
     dp=1;   
 
     break;   
 
  }   
 
  }  
 
  Res.toUpperCase();  
 
  if (Res.indexOf("OK")>0)  
 
      {digitalWrite( ledPinOk, HIGH);   
 
       digitalWrite( ledPinErr, LOW);  
 
      }  
 
  if (Res.indexOf("ERROR")>0)  
 
      {digitalWrite( ledPinOk, LOW);   
 
       digitalWrite( ledPinErr, HIGH);   
 
      }  
 
  }    
 
 void ShowSmsData()   
 
 //-- Read the sender number (NumSms) and the text message (TxtSms)   
 
 //-- The return code format is : [+CMGR: "REC READ","+336xxxxxxxx",,"13/06/10,22:18:35+08"<CR><LF>Message<CR>]  
 
 {dp=0;  
 
  TxtSms="";   
 
  NumSms="";  
 
  Res="";  
 
  while(mySerial.available()!=0)   
 
  {   
 
   c=char(mySerial.read());  
 
   if ((c!=13) && (c!=10))  
 
    Res+=c;  
 
   if ((c==44) && (dp==0))///-- 44 Ascii code for ','   
 
    {//-- Entering Phone Number  
 
     c=char(mySerial.read()); //-- Reading '"'  
 
     c=char(mySerial.read());  
 
     dp=1;}  
 
   if ((c==34) && (dp==1))///-- 34 Ascii code for '"'   
 
    {//-- Leaving Phone Number  
 
     dp=2;}      
 
   if ((c==13) && (dp==2))///-- 13 Ascii code for <CR>   
 
    {//-- Entering Message zone  
 
     c=char(mySerial.read()); //-- Reading <LF>  
 
     dp=3;}  
 
   if ((c==13) && (dp==3))///-- 13 Ascii code for <CR>   
 
    {//-- Leaving Message zone  
 
     dp=4;}  
 
   switch(dp){   
 
   case 1 :  
 
       NumSms+=c;   
 
       break;   
 
   case 3 :   
 
       TxtSms+=c;  
 
       break;  
 
      }  
 
  }  
 
 TxtSms.toUpperCase();  
 
 TxtSms.trim();  
 
 Res.toUpperCase();  
 
 if (Res.indexOf("OK")>0)  
 
      {digitalWrite( ledPinOk, HIGH);   
 
       digitalWrite( ledPinErr, LOW);  
 
      }  
 
 if (Res.indexOf("ERROR")>0)  
 
      {digitalWrite( ledPinOk, LOW);   
 
       digitalWrite( ledPinErr, HIGH);   
 
      }  
 
 }   
 
 void SendSms()  
 
  {   
 
  mySerial.println("AT+CMGS="+NumSms);   
 
  delay(1000);   
 
  mySerial.println(message);   
 
  delay(1000);   
 
  mySerial.println((char)26);//the ASCII code of the ctrl+z is 26   
 
  delay(1000);   
 
  ShowSerialData();   
 
  delay(1000);   
 
  }  
 
  void SendCmdMessage()   
 
  {  
 
  mySerial.println(message);   
 
  delay(1000);   
 
  }   
 
  void ShowSerialData()   
 
  {Res="";  
 
  while(mySerial.available()!=0)  
 
  {c=char(mySerial.read());   
 
   if ((c!=13) && (c!=10))  
 
    Res+=c;  
 
  }  
 
   Res.toUpperCase();   
 
   if (Res.indexOf("OK")>0)  
 
      {digitalWrite( ledPinOk, HIGH);   
 
       digitalWrite( ledPinErr, LOW);  
 
      }  
 
   if (Res.indexOf("ERROR")>0)  
 
      {digitalWrite( ledPinOk, LOW);   
 
       digitalWrite( ledPinErr, HIGH);   
 
      }  
 
  }

BigDog

Hassan Gazal · Jul 27, 2013

just one thing , i have already find the target GSM module on Ebay , and i live in Egypt

My friend told me that they will not permit this module to pass in Customs at the airport , so is it right ??
that's mean if i pay to ebay i will not receive the module

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