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Arduino GSM shield
By Boris Landoni on March 21, 2011
This is a very low cost and simple Arduino GSM and GPRS shield. We use the module SIMCom SIM900. It’s the cheaper module now avalaible in the market. The module is not simple to mount by an hobbyst, so we use the Breakboard TDGGSM_900 that we presented in this post.
You can buy the GSM module premounted from our cart.
To connect this module to Arduino we make a PCB that include a LM317 some capacitor filter and no more.
The LM317 give to module about 3.9V.
There is a switch to select the way to comunicate with arduino:
– throw serial hardware (pin 0 and 1)
– throw serial software (pin 4 and 5)
R1: 470 ohm
R2: 1 kohm
C1-C3: 100 nF
C2-C4: 470 µF 25 VLU1: LM317
GSM: TDGGSM_900 module
SW1: switch
P1: Microswitch
Selecting the serial hardware there are no problem with the baudrate (the default module baudrate is 115200) but there are problem programming the module (the serial is also used to upload the sketch).
Using instead the pin 4 and 5 there aren’t problems to upload the sketch but the maximum baudrate for NewSoftSerial (the serial library) is 57600.
We performed a GSM library to controll easly the module. The GSM library is a modified version of the library of HWKitchen.
With our version we controll the module throw the pin 4 and 5 (so normal digital pin) and our GSM libray include also the NewSoftSerial, so you can easy control the module, send and read SMS, make call, control the GSM state ecc.
Download GSM_Shield_Library
New GSM/GPRS library
This is the GSM_shield library documentation:
Download GSM_Shield_Library
New GSM/GPRS library
In this page you can find some example.
Example to test library
/* GSM Shield example
created 2011
by Boris Landoni
This example code is in the public domain.
http://www.open-electronics.org
http://www.futurashop.it
*/
#include <GSM_Shield.h>
//for enable disable debug rem or not the string #define DEBUG_PRINT
// definition of instance of GSM class
GSM gsm;
void setup() {
Serial.begin(9600);
Serial.println("system startup");
//gsm.InitSerLine(9600); //initialize serial 1
gsm.TurnOn(9600); //module power on
//gsm.InitSerLine(9600); //initialize serial 1
gsm.InitParam(PARAM_SET_1);//configure the module
gsm.Echo(1); //enable AT echo
}
void loop()
{
int ver;
ver=gsm.LibVer();
Serial.print("Response Ver ");
Serial.println(ver);
delay(50000);
}
Example to network registration
/* GSM Shield example
created 2011
by Boris Landoni
This example code is in the public domain.
http://www.open-electronics.org
http://www.futurashop.it
*/
#include <GSM_Shield.h>
//for enable disable debug rem or not the string #define DEBUG_PRINT
// definition of instance of GSM class
GSM gsm;
void setup() {
Serial.begin(9600);
Serial.println("system startup");
//gsm.InitSerLine(9600); //initialize serial 1
gsm.TurnOn(9600); //module power on
//gsm.InitSerLine(9600); //initialize serial 1
gsm.InitParam(PARAM_SET_1);//configure the module
gsm.Echo(1); //enable AT echo
}
void loop()
{
int reg;
reg=gsm.CheckRegistration();
switch (reg){
case REG_NOT_REGISTERED:
Serial.println("not registered");
break;
case REG_REGISTERED:
Serial.println("GSM module is registered");
break;
case REG_NO_RESPONSE:
Serial.println("GSM doesn't response");
break;
case REG_COMM_LINE_BUSY:
Serial.println("comm line is not free");
break;
}
delay(2000);
reg=gsm.IsRegistered();
Serial.print("Registration ");
Serial.println(reg);
delay(50000);
}
Example to test call
/* GSM Shield example
created 2011
by Boris Landoni
This example code is in the public domain.
http://www.open-electronics.org
http://www.futurashop.it
*/
#include <GSM_Shield.h>
//for enable disable debug rem or not the string #define DEBUG_PRINT
// definition of instance of GSM class
GSM gsm;
void setup() {
Serial.begin(9600);
Serial.println("system startup");
//gsm.InitSerLine(9600); //initialize serial 1
gsm.TurnOn(9600); //module power on
//gsm.InitSerLine(9600); //initialize serial 1
gsm.InitParam(PARAM_SET_1);//configure the module
gsm.Echo(1); //enable AT echo
}
void loop()
{
int call;
call=gsm.CallStatus();
switch (call){
case CALL_NONE:
Serial.println("no call");
break;
case CALL_INCOM_VOICE:
Serial.println("incoming voice call");
delay(5000);
gsm.PickUp();
break;
case CALL_ACTIVE_VOICE:
Serial.println("active voice call");
delay(5000);
gsm.HangUp();
break;
case CALL_NO_RESPONSE:
Serial.println("no response");
break;
}
delay(1000);
}
Download GSM_Shield_Library
New GSM/GPRS library
Bigger example
/* GSM Shield example
created 2011
by Boris Landoni
This example code is in the public domain.
http://www.open-electronics.org
http://www.futurashop.it
*/
#include <GSM_Shield.h>
//**************************************************************************
char number[]="+39123456789"; //Destination number
char text[]="hello world"; //SMS to send
byte type_sms=SMS_UNREAD; //Type of SMS
byte del_sms=0; //0: No deleting sms - 1: Deleting SMS
//**************************************************************************
GSM gsm;
char sms_rx[122]; //Received text SMS
//int inByte=0; //Number of byte received on serial port
char number_incoming[20];
int call;
int error;
void setup()
{
Serial.begin(9600);
Serial.println("system startup");
gsm.TurnOn(9600); //module power on
gsm.InitParam(PARAM_SET_1);//configure the module
gsm.Echo(0); //enable AT echo
}
void loop()
{
char inSerial[5];
int i=0;
delay(2000);
Check_Call(); //Check if there is an incoming call
Check_SMS(); //Check if there is SMS
//Check data serial com
if (Serial.available() > 0)
{
while (Serial.available() > 0) {
inSerial[i]=(Serial.read()); //read data
i++;
}
inSerial[i]='\0';
Check_Protocol(inSerial);
}
}
void Check_Protocol(String inStr)
{
Serial.print("Command: ");
Serial.println(inStr);
Serial.println("Check_Protocol");
switch (inStr[0])
{
case 'a' : //Answer
if (gsm.CallStatus()==CALL_INCOM_VOICE){
gsm.PickUp();
Serial.println("Answer");
}
else
{
Serial.println("No incoming call");
}
break;
case 'c': // C //Call
if (inStr.length()<2) //To call variable 'number' comand c
{
Serial.print("Calling ");
Serial.println(number);
gsm.Call(number);
}
if (inStr.length()==2) //To call number in phone book position comand cx where x is the SIM position
{
error=gsm.GetPhoneNumber(inStr[1],number);
if (error!=0)
{
Serial.print("Calling ");
Serial.println(number);
gsm.Call(number);
}
else
{
Serial.print("No number in pos ");
Serial.println(inStr[1]);
}
}
break;
case 'h': //H //HangUp if there is an incoming call
if (gsm.CallStatus()!=CALL_NONE)
{
Serial.println("Hang");
gsm.HangUp();
}
else
{
Serial.println("No incoming call");
}
break;
case 's': //S //Send SMS
Serial.print("Send SMS to ");
Serial.println(number);
error=gsm.SendSMS(number,text);
if (error==0) //Check status
{
Serial.println("SMS ERROR \n");
}
else
{
Serial.println("SMS OK \n");
}
break;
case 'p': //Read-Write Phone Book
if (inStr.length()==3)
{
switch (inStr[1])
{
case 'd': //Delete number in specified position pd2
error=gsm.DelPhoneNumber(inStr[2]);
if (error!=0)
{
Serial.print("Phone number position ");
Serial.print(inStr[2]);
Serial.println(" deleted");
}
break;
case 'g': //Read from Phone Book position pg2
error=gsm.GetPhoneNumber(inStr[2],number);
if (error!=0) //Find number in specified position
{
Serial.print("Phone Book position ");
Serial.print(inStr[2]);
Serial.print(": ");
Serial.println(number);
}
else //Not find number in specified position
{
Serial.print("No Phone number in position ");
Serial.println(inStr[2]);
}
break;
case 'w': //Write from Phone Book Position pw2
error=gsm.WritePhoneNumber(inStr[2],number);
if (error!=0)
{
Serial.print("Number ");
Serial.print(number);
Serial.print(" writed in Phone Book position ");
Serial.println(inStr[2]);
}
else Serial.println("Writing error");
break;
}
}
break;
}
delay(1500);
return;
}
void Check_Call() //Check status call if this is available
{
call=gsm.CallStatus();
switch (call)
{
case CALL_NONE:
Serial.println("no call");
break;
case CALL_INCOM_VOICE:
gsm.CallStatusWithAuth(number_incoming,0,0);
Serial.print("incoming voice call from ");
Serial.println(number_incoming);
break;
case CALL_ACTIVE_VOICE:
Serial.println("active voice call");
break;
case CALL_NO_RESPONSE:
Serial.println("no response");
break;
}
return;
}
void Check_SMS() //Check if there is an sms 'type_sms'
{
char pos_sms_rx; //Received SMS position
pos_sms_rx=gsm.IsSMSPresent(type_sms);
if (pos_sms_rx!=0)
{
//Read text/number/position of sms
gsm.GetSMS(pos_sms_rx,number_incoming,sms_rx,120);
Serial.print("Received SMS from ");
Serial.print(number_incoming);
Serial.print("(sim position: ");
Serial.print(word(pos_sms_rx));
Serial.println(")");
Serial.println(sms_rx);
if (del_sms==1) //If 'del_sms' is 1, i delete sms
{
error=gsm.DeleteSMS(pos_sms_rx);
if (error==1)Serial.println("SMS deleted");
else Serial.println("SMS not deleted");
}
}
return;
}
NEW GPRS FUNCTION
Test AT command
#include "SIM900.h"
#include <NewSoftSerial.h>
#include "inetGSM.h"
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to communicate with SIM900 through AT commands.
InetGSM inet;
char msg[150];
int numdata;
char inSerial[40];
int i=0;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(4800))
Serial.println("\nstatus=READY");
else Serial.println("\nstatus=IDLE");
};
void loop()
{
//Read for new byte on serial hardware,
//and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};
void serialhwread(){
i=0;
if (Serial.available() > 0){
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}
inSerial[i]='\0';
if(!strcmp(inSerial,"/END")){
Serial.println("_");
inSerial[0]=0x1a;
inSerial[1]='\0';
gsm.SimpleWrite(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,"TEST")){
Serial.println("SIGNAL QUALITY");
gsm.SimpleWrite("AT+CSQ");
}
//Read last message saved.
if(!strcmp(inSerial,"MSG")){
Serial.println(msg);
}
else{
Serial.println(inSerial);
gsm.SimpleWrite(inSerial);
}
inSerial[0]='\0';
}
}
void serialswread(){
gsm.SimpleRead();
}
GPRS Client
#include "SIM900.h"
#include <NewSoftSerial.h>
#include "inetGSM.h"
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to start a connection as client.
InetGSM inet;
char msg[100];
int numdata;
char inSerial[30];
int i=0;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(4800))
Serial.println("\nstatus=READY");
else Serial.println("\nstatus=IDLE");
//GPRS attach, put in order APN, username and password.
//If no needed auth let them blank.
if (gsm.attachGPRS("internet.wind", "", ""))
Serial.println("status=ATTACHED");
else Serial.println("status=ERROR");
delay(5000);
//TCP Client GET, send a GET request to the server and
//save the reply.
numdata=inet.httpGET("www.google.com", 80, "/", msg, 100);
//Print the results.
Serial.println("\nNumber of data received:");
Serial.println(numdata);
Serial.println("Data received:");
Serial.println(msg);
//Tweet
//inet.tweet("*********************key************", "An Arduino at #cpes15");
};
void loop()
{
//Read for new byte on serial hardware,
//and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};
void serialhwread(){
i=0;
if (Serial.available() > 0){
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}
inSerial[i]='\0';
if(!strcmp(inSerial,"/END")){
Serial.println("_");
inSerial[0]=0x1a;
inSerial[1]='\0';
gsm.SimpleWrite(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,"TEST")){
Serial.println("SIGNAL QUALITY");
gsm.SimpleWrite("AT+CSQ");
}
//Read last message saved.
if(!strcmp(inSerial,"MSG")){
Serial.println(msg);
}
else{
Serial.println(inSerial);
gsm.SimpleWrite(inSerial);
}
inSerial[0]='\0';
}
}
void serialswread(){
gsm.SimpleRead();
}
GPRS Server
#include "SIM900.h"
#include <NewSoftSerial.h>
#include "inetGSM.h"
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to start a connection as server.
InetGSM inet;
char msg[100];
int numdata;
char inSerial[30];
int i=0;
long lasttime;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(4800))
Serial.println("\nstatus=READY");
else Serial.println("\nstatus=IDLE");
//GPRS attach, put in order APN, username and password.
//If no needed auth let them blank.
if (gsm.attachGPRS("internet.wind", "", ""))
Serial.println("status=ATTACHED");
else Serial.println("status=ERROR");
delay(5000);
//Read IP address.
int i=0;
while(i<20){
gsm.SimpleRead();
i++;
}
delay(5000);
gsm.write((const uint8_t*)"AT+CIFSR\r", 10);
gsm.read(msg, 200);
Serial.println(msg);
delay(5000);
//Tweet
//inet.tweet("*********************key************", "An Arduino at #cpes15");
//TCP Server. Start the socket connection
//as server on the assigned port.
Serial.println(msg);
delay(5000);
if (gsm.connectTCPServer(80))
Serial.println("status=TCPSERVERWAIT");
else Serial.println("ERROR in Server");
lasttime=millis();
};
void loop(){
//serialhwread();
//serialswread();
//Check if there is an active connection.
if (gsm.connectedClient()){
//Read and print the last message received.
gsm.read(msg, 200);
Serial.println(msg);
}
};
/*
void loop()
{
serialhwread();
serialswread();
};
*/
void serialhwread(){
i=0;
if (Serial.available() > 0){
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}
inSerial[i]='\0';
if(!strcmp(inSerial,"/END")){
Serial.println("_");
inSerial[0]=0x1a;
inSerial[1]='\0';
gsm.SimpleWrite(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,"TEST")){
Serial.println("SIGNAL QUALITY");
gsm.SimpleWrite("AT+CSQ");
}
//Read last message saved.
if(!strcmp(inSerial,"MSG")){
Serial.println(msg);
}
else{
Serial.println(inSerial);
gsm.SimpleWrite(inSerial);
}
inSerial[0]='\0';
}
}
void serialswread(){
gsm.SimpleRead();
}
Test SMS without GPRS function
#include "SIM900.h"
#include <NewSoftSerial.h>
//If not used, is better to exclude the HTTP library,
//for RAM saving.
//If your sketch reboots itself proprably you have finished,
//your memory available.
//#include "inetGSM.h"
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to send and receive SMS.
char msg[200];
int numdata;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(4800))
Serial.println("\nstatus=READY");
else Serial.println("\nstatus=IDLE");
//Enable this two lines if you want to send an SMS.
//if (gsm.sendSMS("3471234567", "Arduino SMS"))
//Serial.println("\nSMS sent OK");
};
void loop()
{
char smsbuffer[160];
char n[20];
//Read if there are messages on SIM card and print them.
if(gsm.readSMS(smsbuffer, 160, n, 20))
{
Serial.println(n);
Serial.println(smsbuffer);
}
delay(1000);
};
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