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GPS/GPRS/GSM Module V2.0 (SKU:TEL0051)Introduction
This is a GPS/GPRS/GSM shield from DFRobot. This shield with a Quad-band GSM/GPRS engine
works on frequencies EGSM 900MHz/DCS 1800MHz and GSM850 MHz/PCS 1900MHz. It also
supports GPS technology for satellite navigation. It's possible for your robot and control system to
send messages and use the GSM network.
It is controlled via AT commands(GSM07.07 ,07.05 and SIMCOM enhanced AT Commands). And the
design of this shield allows you to drive the GSM & GPS function directly with the computer and the
Arduino Board. It includes a high-gain SMD antenna for GPS & GSM.
This GPS/GPRS/GSM shield uses an embedded SIM548C chip from SIMCom.Featuring an industry-
standard interface and GPS function, the combination of both technologies allows goods, vehicles and
people to be tracked seamlessly at any location and anytime with signal coverage.
Specification
Power supply: 6-12v
Low power consumption (100mA@7v - GSM mode)
Quad-Band 850/900/18001900MHz
GPRS multi-slot class 10
Support GPS technology for satellite navigation
Embeded high-gain SMD antennas for GPS & GSM
Directly support 4*4 button pad
USB/Arduino control switch
Size: 70x55mm
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Pin Out
GPS/GPRS/GSM Module V2.0 (SKU:TEL0051)
More details about switches:
Switch S1: PC upload program to Arduino board/PC communicates with GPS/GPRS/GSM
Module( Arduino programming/module communication).
Switch S2: GPS/GPRS/GSM Module directly connects with PC through USB port or module
communicates with Arduino board, which communicates with PC(USB/Arduino serial
communication).
Switch S3: GPS power supply to be on/off(GPS power switch).
Tutorial
Prepare for Driving the GSM mode
The hardware requirements:
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1. Arduino Uno
2. GPS/GPRS/GSM Module V2.0
3. SIM Card
4. Earphone & Microphone
5. External power supply via the power jack
it is recommended you to supply 7~12v power via the power jack. When using the GSM mode, the
module requires an external power. But the power consumption is not high,just 200mA@7v, when
calling.
Module driver pin jumpers:
Applying the Module Pin Jumpers(J10-J12) will allocate Pin 3,4,5 for driving the module. Removing
the jumpers will release the above Pins, and you could connect the driver pins to the other digital pins
on your board to avoid the pin conflict.
Hardware Connection photo:
TEL0051 Hardware connection
Following the steps included in the sketch below first! The Sketch for GSM mode:
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1 // #
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// # Editor : Lauren from DFRobot
// # Date : 23.05.2012
// # E-Mail : [email protected]
// # Product name: GPS/GPRS/GSM Module V2.0
// # Product SKU : TEL0051
// # Version : 0.1
// # Description:
// # The sketch for driving the gsm mode via the USB interface
// # Steps:
// # 1. Turn the S1 switch to the EN(right side)
// # 2. Upload the sketch to the Arduino board
// # 3. Turn the S1 switch to the communication mode(left side)
// # 4. Turn the S2 switch to the USB side(left side)
// # 5. send AT commands via the Arduino Serial monitor
// # wiki link- http://www.dfrobot.com/wiki/index.php?title=GPS/GPRS/GSM_Module_V2.0
byte gsmDriverPin[3] = {
3,4,5};//The default digital driver pins for the GSM and GPS mode
//If you want to change the digital driver pins
//or you have a conflict with D3~D5 on Arduino board,
//you can remove the J10~J12 jumpers to reconnect other driver pins for the module!
void setup(){
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InitGsmMode();
}
void InitGsmMode(){
//Init the driver pins for GSM function
for(int i = 0 ; i < 3; i++){
pinMode(gsmDriverPin[i],OUTPUT);
}
digitalWrite(3,LOW);//Enable the GSM mode
digitalWrite(4,HIGH);//Disable the GPS mode
//Output GSM Timing
digitalWrite(5,HIGH);
delay(1500);
digitalWrite(5,LOW);
}
void loop(){
delay(100);
}
How to drive the GSM Mode via USB port
1. If your module works, the indicator LEDs beside the switch S2 will light up, this means that
the module is running correctly. The LED marked "NET" is used to drive a network status
indication LED. The working state of this LED is listed below.
2. Send the AT commands to the module by using Coolterm(or use the Arduino serial monitor).
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Note: If you want to program the Arduino, please disconnect the coolterm to release the communication port.
Network indication
State The GSM part of SIM548C function
Off The GSM part of the module is not running
64ms On/ 800ms Off The GSM part of the module does not find the network
64ms On/ 3,000ms Off The GSM part of the module found the network
64ms On/ 300ms Off GPRS communication
Serial communication
Default baudrate: 9600
Please do some settings as #Recommended settings before connection.If have trouble sending
Ctrl+Z, please refers to #Ways to send Ctrl +Z in Coolterm
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Serial monitor
GSM module signal strength test
Signal strength test with on-chip antenna:
Sending AT command for signal quantity report AT+CSQ through serial port terminal application, will
receive signal strength as below.
GSM module signal strength test with on-chip antenna
The returned data “15,0”, the first value “15” means the signal strength is:
Value Signal Strength
0 -113dBm or less
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1 -111dBm
2~30 -109~-53dBm
31 -51dBm or greater
99not know or not
detectable
The later value “0” means channel bit error rate.
Signal strength test with external antenna:
GSM module signal strength test with external antenna
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Types of AT commands and responses
1. AT+<x>=? : Test command
The mobile equipment returns the list of parameters and value ranges set with the
corresponding Write command or by internal processes.
2. AT+<x>? : Read command
This command returns the currently set value of the parameter or parameters
3. AT+<x>=<..> : Write command
This command sets the user-definable parameter values.
4. AT+<x> : Execution command
This execution command reads non-variable parameters affected by internal processes in the
GSM engine
Commonly used AT commands
1. AT : Test the serial communication.if it works,get "ok" as the picture show.
2. ATD<num>; : Dial a number
3. ATA : Answer an incoming call
4. ATH : Disconnect existing connection
5. AT+UART : Configure dual serial port mode
6. AT+CSQ : Signal quality report
7. AT+CMGF : Select sms messages format
8. AT+CMGS : Send sms message
1. After you input the sms, press 'ctrl-z'[HEX:0x1A]to send the message.
2. Press 'ESC' to quit without sending.
9. AT+CNMI : New sms message indications
10. AT+CLVL : Loud speaker volume level
11. AT+CRSL : Ringer sound level
12. AT+CMIC : Change the microphone gain level
For more detail AT commands, please check the document here!
Prepare for Driving the GPS mode
The hardware requirements:
1. Arduino Uno
2. GPS/GPRS/GSM Module V2.0
3. External power supply via the power jack
We recommend you to supply 7~12v power via the power jack. When using the GPS mode, the
module requires an external power. But the power consumption is not high, just [email protected]
Module driver pin jumpers:
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Applying the Module Pin Jumpers(J10-J12) will allocate Pin 3,4,5 for driving the module. Removing
the jumpers will release the above Pins,
Hardware Connection photo:
How to drive the GPS Mode via USB port
1. After turn switch s3 on (the right side), the GPSPWR led will be lit.
2. In this mode, switch s2 is on left side. The GPS module communicates directly with PC. The
serial port terminal application will show the data sent out by GPS module.
The Sketch for GPS USB mode: Following the steps included in sketch below first!
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// #
// # Editor : Lauren from DFRobot
// # Date : 23.05.2012
// # E-Mail : [email protected]
// # Product name: GPS/GPRS/GSM Module V2.0
// # Product SKU : TEL0051
// # Version : 0.1
// # Description:
// # The sketch for driving the gps mode via the USB interface
// # Steps:
// # 1. Turn the S1 switch to the EN(right side)
// # 2. Upload the sketch to the Arduino board
// # 3. Turn the S1 switch to the communication mode(left side)
// # 4. Turn the S2 switch to the USB side(left side)
// # 5. Turn the S3 switch to the ON side(right side)
// # 5. get the information from the module via the Arduino Serial monitor(baud rate:4800)
// # For more detail information, please check the product wiki page.~.
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// # Wiki link - http://www.dfrobot.com/wiki/index.php?title=GPS/GPRS/GSM_Module_V2.0
byte gsmDriverPin[3] = {
3,4,5};//The default digital driver pins for the GSM and GPS mode
//If you want to change the digital driver pins
//or you have a conflict with D3~D5 on Arduino board,
//you can remove the J10~J12 jumpers to reconnect other driver pins for the module!
void setup(){
InitGpsMode();
}
void InitGpsMode(){
//Init the driver pins for GSM function
for(int i = 0 ; i < 3; i++){
pinMode(gsmDriverPin[i],OUTPUT);
}
digitalWrite(3,HIGH);//Disable the GSM mode
digitalWrite(4,LOW);//Enable the GPS mode
}
void loop(){
delay(1000);
}
Serial communication
Default baudrate: 4800
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Coolterm(or Arduino serial monitor) is the recommended serial port terminal application. After serial
port is successfully connected with PC in Coolterm, GPS module will send out data continuously as
below:
Serial monitor in GPS mode via USB port
For location of the data received, please refer to Location Mapping (GPRMC)
How to drive the GPS Mode via Arduino board
1. After turn switch s3 on (the right side), the GPSPWR led will be lit.
2. In this mode, switch s2 is on right side. The GPS module communicates with Arduino board,
and Arduino board communicates with PC. The serial port terminal application will show
preliminary processed data from Arduino board, which gets the data from GPS module.
The Sketch for GPS mode via Arduino board: Following the steps included in sketch below first!
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1 // #
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// # Editor : Lauren from DFRobot
// # Date : 23.05.2012
// # E-Mail : [email protected]
// # Product name: GPS/GPRS/GSM Module V2.0
// # Product SKU : TEL0051
// # Version : 0.1
// # Description:
// # The sketch for driving the gps mode via the Arduino TTL interface
// # Steps:
// # 1. Turn the S1 switch to the EN(right side)
// # 2. Upload the sketch to the Arduino board
// # 3. Turn the S1 switch to the communication mode(left side)
// # 4. Turn the S2 switch to the Arduino side(right side)
// # 5. Turn the S3 switch to the ON side(right side)
// # 5. get the information from the module via the Arduino Serial monitor(baud rate:4800)
// # For more detail information, please check the product wiki page.~.
// # wiki link - http://www.dfrobot.com/wiki/index.php?title=GPS/GPRS/GSM_Module_V2.0
byte gsmDriverPin[3] = {
3,4,5};//The default digital driver pins for the GSM and GPS mode
//If you want to change the digital driver pins
//or you have a conflict with D3~D5 on Arduino board,
//you can remove the J10~J12 jumpers to reconnect other driver pins for the module!
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void setup()
{
InitGpsMode();//Init the module to the GPS mode
Serial.begin(4800);//Init the serial baudrate
Serial.println("$GPGGA statement information: ");
}
void InitGpsMode(){
//Init the driver pins for GSM function
for(int i = 0 ; i < 3; i++){
pinMode(gsmDriverPin[i],OUTPUT);
}
digitalWrite(3,HIGH);//Disable the GSM mode
digitalWrite(4,LOW);//Enable the GPS mode
}
void loop()
{
while(1) //get the GPS datas and print them to the Arduino Serial monitor
{
Serial.print("UTC:");
UTC();
Serial.print("Lat:");
latitude();
Serial.print("Dir:");
lat_dir();
Serial.print("Lon:");
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longitude();
Serial.print("Dir:");
lon_dir();
Serial.print("Alt:");
// altitude();
Serial.println(' ');
Serial.println(' ');
}
}
double Datatransfer(char *data_buf,char num)//convert the data to the float type
{ //*data_buf：the data array
//the number of the right of a decimal point
double temp=0.0;
unsigned char i,j;
if(data_buf[0]=='-')//
{
i=1;
//process the data array
while(data_buf[i]!='.')
temp=temp*10+(data_buf[i++]-0x30);
for(j=0;j<num;j++)
temp=temp*10+(data_buf[++i]-0x30);
//convert the int type to the float type
for(j=0;j<num;j++)
temp=temp/10;
//convert to the negative number
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temp=0-temp;
}
else//for the positive number
{
i=0;
while(data_buf[i]!='.')
temp=temp*10+(data_buf[i++]-0x30);
for(j=0;j<num;j++)
temp=temp*10+(data_buf[++i]-0x30);
for(j=0;j<num;j++)
temp=temp/10 ;
}
return temp;
}
char ID()//Match the ID commands
{
char i=0;
char value[6]={
'$','G','P','G','G','A' };//match the gps protocol
char val[6]={
'0','0','0','0','0','0' };
while(1)
{
if(Serial.available())
{
val[i] = Serial.read();//get the data from the serial interface
if(val[i]==value[i]) //Match the protocol
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{
i++;
if(i==6)
{
i=0;
return 1;//break out after get the command
}
}
else
i=0;
}
}
}
void comma(char num)//get ','
{
char val;
char count=0;//count the number of ','
while(1)
{
if(Serial.available())
{
val = Serial.read();
if(val==',')
count++;
}
if(count==num)//if the command is right, run return
return;
}
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}
void UTC()//get the UTC data -- the time
{
char i;
char time[9]={
'0','0','0','0','0','0','0','0','0'
};
double t=0.0;
if(ID())//check ID
{
comma(1);//remove 1 ','
//get the datas after headers
while(1)
{
if(Serial.available())
{
time[i] = Serial.read();
i++;
}
if(i==9)
{
i=0;
t=Datatransfer(time,2);//convert data
t=t+80000.00;//convert to the chinese time GMT+8 Time zone
Serial.println(t);//Print data
return;
}
}
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}
}
void latitude()//get latitude
{
char i;
char lat[10]={
'0','0','0','0','0','0','0','0','0','0'
};
if( ID())
{
comma(2);
while(1)
{
if(Serial.available())
{
lat[i] = Serial.read();
i++;
}
if(i==10)
{
i=0;
Serial.println(Datatransfer(lat,5),5);//print latitude
return;
}
}
}
}
void lat_dir()//get dimensions
{
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char i=0,val;
if( ID())
{
comma(3);
while(1)
{
if(Serial.available())
{
val = Serial.read();
//Serial.println(val,BYTE);//print dimensions
Serial.println(val);//print dimensions
i++;
}
if(i==1)
{
i=0;
return;
}
}
}
}
void longitude()//get longitude
{
char i;
char lon[11]={
'0','0','0','0','0','0','0','0','0','0','0'
};
if(ID())
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{
comma(4);
while(1)
{
if(Serial.available())
{
lon[i] = Serial.read();
i++;
}
if(i==11)
{
i=0;
Serial.println(Datatransfer(lon,5),5);//print longitude
return;
}
}
}
}
void lon_dir()//
{
char i=0,val;
if(ID())
{
comma(5);
while(1)
{
if(Serial.available())
{
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val = Serial.read();
//Serial.println(val,BYTE);
Serial.println(val);
i++;
}
if(i==1)
{
i=0;
return;
}
}
}
}
void altitude()//get altitude data
{
char i,flag=0;
char alt[8]={
'0','0','0','0','0','0','0','0'
};
if( ID())
{
comma(9);
while(1)
{
if(Serial.available())
{
alt[i] = Serial.read();
if(alt[i]==',')
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flag=1;
else
i++;
}
if(flag)
{
i=0;
Serial.println(Datatransfer(alt,1),1);//print altitude data
return;
}
}
}
}
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Serial communication
Default baudrate: 4800
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Serial monitor in GPS mode via Arduino board
Tips for Coolterm usage
Recommended settings
Settings below is recommended
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Recommended Coolterm settings
How to send out text message in GSM mode via Coolterm
After the network indication LED showing GSM module has found the network, we can use it to send
out message.
Setp 1: Set the system to text mode(as opposed to PDU mode) with command AT+CMGF=1(type
"AT+CMGF=1" in the input line, then press <ENTER> KEY), you will get response as below.
Step 1
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Step 2: Set message receiver number with command AT+CMGS="Number"(replace Number with
your destination number),after pressing <ENTER> key, it will show as follow
Step 2
Step 3: Type in you message content, end with pressing <ENTER> key.
Step 3
Step 4: Send Ctrl character Ctrl+Z to verify your message sending (just pressing Ctrl and Z
simultaneously, <ENTER> key is not need after that).If it send out successfully, it will show as below.
Step 4
Ways to send Ctrl +Z in Coolterm
1. After typing the message text, press enter key, it will show:
'Enter' after text finished
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Then, in the input area, pressing Ctrl+Z will send out the single ctrl character successfully as below:
After press Ctrl+Z
2. Ctrl characters can also be sent out in their hexadecimal format, in which form 1A is the value of
Ctrl+Z:
Sending Ctrl+Z with in hexadecimal format
FQA about coolterm usage in GSM/GPRS/GPS module V2.0
1.Serial connection errs. When connecting to PC, serial port terminal application occasionally warns
“A Serial Port Err Occur 103: No Stop Bit Received” or ” A Serial Port Err Occur 104: stop bit received
too early”
A: set Coolterm in options-receive-ignore receiving signal err to ignore connection err and it will
reconnect automatically.
2.Serial port terminal application warns “Normal power down” when reconnect after disconnect, and
Network indication LEDs both turn off.
A: Choose disconnect, and connect again
The Arduino board will reset at every connection to PC. During resetting, the Arduino board will emit a
low pulse to pin PWRKEY of GPS module. So if GPS module is already on before connection, the low
pulse will switch it off, if not, the pulse will switched it on.
3.Serial port terminal application send out all the strings on the screen after pressing Ctrl+Z, when
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trying to send message in GSM USB mode.
A: It is possible to send Ctrl characters when the terminal is set to Line Mode. We can choose the
Line Mode in options-terminal-terminal mode, or we can send the Ctrl character though sending string
box of Coolterm in hexadecimal format. Please refer to Ways to send Ctrl +Z in Coolterm.
4.Restart the serial port terminal application always works for other troubles.
