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Arduino GSM Shield
The Arduino GSM shield (http://arduino.cc/en/Main/ArduinoGSMShield) allows an Arduino board to connect to the internet, send
and receive SMS, and make voice calls using the GSM library (http://arduino.cc/en/Reference/GSM).
The shield will work with the Arduino Uno out of the box. The shield will work with the Mega, Mega ADK, and Leonardo boards with
a minor modification (http://arduino.cc/en/Guide/GSMShieldLeonardoMega). The Due is not supported at this time.
The GSM library (http://arduino.cc/en/Reference/GSM) is included with Arduino IDE 1.0.4 and later
(http://arduino.cc/en/Main/Software).

- What is GSM
- What is GPRS
- Network operator requirements
- SIM cards
- Notes on the Telefonica/Bluevia SIM included with the shield
- Connecting the Shield
- GSM Library
- Testing the modem and network connection
- Sending a SMS message
- Connecting to the internet
- Making voice calls
- Next steps

What is GSM
GSM is an international standard for mobile telephones. It is an acronym that stands for Global System for Mobile Communications.
It is also sometimes referred to as 2G, as it is a second-generation cellular netwTo use GPRS for internet access, and for the Arduino
to request or serve webpages, you need to obtain the Access Point Name (APN) and a username/password from the network
operator. See the information in Connecting to the Internet for more information about using the data capabilities of the shield.
Among other things, GSM supports outgoing and incoming voice calls, Simple Message System (SMS or text messaging), and data
communication (via GPRS).

What is GPRS
GPRS is a packet switching technology that stands for General Packet Radio Service. It can provide idealized data rates between 56114 kbit per second.
A number of technologies such as SMS rely on GPRS to function. With the GSM shield, it is also possible to leverage the data
communication to access the internet. Similar to the Ethernet and WiFi libraries, the GSM library allows the Arduino to act as a client
or server, using http calls to send and receive web pages.

Network operator requirements
To access a network, you must have a subscription with a mobile phone operator (either prepaid or contract), a GSM compliant
device like the GSM shield or mobile phone, and a Subscriber Identity Module (SIM) card. The network operator provides the SIM
card, which contains information like the mobile number, and can store limited amounts of contacts and SMS messages.
To use GPRS for internet access, and for the Arduino to request or serve webpages, you need to obtain the Access Point Name (APN)
and a username/password from the network operator. See the information in Connecting to the Internet for more information
about using the data capabilities of the shield.

SIM cards
In addition to the GSM shield and an Arduino, you need a SIM card. The SIM represents a contract with a communications provider.
The communications provider selling you the SIM has to either provide GSM coverage where you are, or have a roaming agreement
with a company providing GSM coverage in your location.
It's common for SIM cards to have a four-digit PIN number associated with them for security purposes. Keep note of this number,
as it's necessary for connecting to a network. If you lose the PIN associated with your SIM card, you may need to contact your
network operator to retrieve it. Some SIM cards become locked if an incorrect PIN is entered too many times. If you're unsure of
what the PIN is, look at the documentation that came with your SIM.
Using a PUK (PIN Unlock Code), it is possible to reset a lost PIN with the GSM shield and an Arduino. The PUK number will come with
your SIM card documentation.
Look at the PIN Management (http://arduino.cc/en/Tutorial/GSMToolsPinManagement) example in the "tools" folder, bundled with
the GSM library for an example of how to manage your PIN number with the PUK.
There are a few different sizes of SIM cards; the GSM shield accepts cards in the mini-SIM format (25mm long and 15mm wide).

Notes on the Telefonica/Bluevia SIM included with the shield
The GSM shield comes bundled with a SIM from Telefonica/Bluevia that will work well for developing machine to machine (M2M)
applications. It is not necessary to use this specific card with the shield. You may use any SIM that works on a network in your area.
The Bluevia SIM card includes a roaming plan. It can be used on any supported GSM network. There is coverage throughout the
Americas and Europe for this SIM, check the Bluevia service availability page (http://bluevia.com/en/page/tech.arduino.service) for
specific countries that have supported networks.
Activation of the SIM is handled by Bluevia. Detailed instructions on how to register and activate your SIM online and add credit are
included on a small pamphlet (http://arduino.cc/en/uploads/Guide/GSMShield_Flyer.pdf) that comes with your shield. The SIM
must be inserted into a powered GSM shield that is mounted on an Arduino for activation.
These SIM card come without a PIN, but it is possible to set one using the GSM library's GSMPIN class
(http://arduino.cc/en/Reference/GSMPINConstructor).
You cannot use the included SIM to place or receive voice calls.
You can only place and receive SMS with other SIMs on the Bluevia network.
It's not possible to create a server that accepts incoming requests from the public internet. However, the Bluevia SIM will accept
incoming requests from other SIM cards on the Bluevia network.
For using the voice, and other functions of the shield, you'll need to find a different network provider and SIM. Operators will have
different policies for their SIM cards, check with them directly to determine what types of connections are supported.

Connecting the Shield
If you are using an Arduino Uno, follow the instructions below. If you are using an Arduino Mega, Mega ADK, or Leonardo, you must
follow these instructions (http://arduino.cc/en/Guide/GSMShieldLeonardoMega). The GSM shield is not currently supported on the
Due.
To use the shield, you'll need to insert a SIM card into the holder. Slide the metal bracket away from the edge of the shield and lift
the cradle up.

Insert the SIM in the plastic holder so the metal contacts are facing the shield, with the notch of the card at the top of the bracket.

Slide the SIM all the way into the bracket

Push the SIM to the board and slide the metal bracket towards the edge of the shield to lock it in place.
Once the SIM is inserted, mount it on top of an Arduino board.

To upload sketches to the board, connect it to your computer with a USB cable and upload your sketch with the Arduino IDE. Once
the sketch has been uploaded, you can disconnect the board from your computer and power it with an external power supply.
Digital pins 2, 3 and 7 are reserved for communication between the Arduino and modem and cannot be used by your sketches.
Communication between the moden and Arduino is handled by the Software Serial library
(http://arduino.cc/en/Reference/SoftwareSerial) on pins 2 and 3. Pin 7 is used for the modem reset.
When the yellow status LED turns on, it means the modem is powered, and you can try connecting to the network.
Developer versions of the GSM shield required you to press press the Power button on the shield for a few moments to turn the
modem on. If you have an early version of the shield, and it does not turn on automatically, you can solder a jumper to the CTRL/D7
pad on the reverse side of the board, and it will turn on when an attached Arduino receives power.

The shield should work in any area with GSM coverage. Before buying the shield please verify that there is this kind of coverage
where you plan to use it.
GSM Library
The GSM library handles communication between Arduino and the GSM shield. The majority of functions are for managing data,
voice, and SMS communication. There are also a number of utilities for managing information about the modem and the SIM card's
PIN. See the library reference (http://arduino.cc/en/Reference/GSM) pages for more information and a complete set of examples.

Testing the modem and network connection
This sketch will check the modem's IMEI number. This number is unique to each modem, and is used to identify valid devices that
can connect to a GSM network. Once the number has been read from the modem, the Arduino will print out the network carrier it is
connected to, and the signal strength of the network over the serial port.
/ ipr teGMlbay
/ mot h S irr
#nld <S.>
icue GMh
/ PNNme
/ I ubr
#eiePNUBR"
dfn INME "
/ iiilz telbayisac
/ ntaie h irr ntne
GMgmcestu)
S sAcs(re;
/ icuea're prmtrfrdbgeald
/ nld
tu' aaee o eu nbe
GMcne sanrewrs
SSanr cneNtok;
GMoe mdmet
SMdm oeTs;
/ Sv dt vrals
/ ae aa aibe
Srn IE =";
tig MI
"
/ sra mntrrsl msae
/ eil oio eut esgs
Srn erret="RO"
tig rotx
ERR;
vi stp)
od eu(
{
/ iiilz sra cmuiain
/ ntaie eil omnctos
Sra.ei(60;
eilbgn90)
Sra.rnl(GMntok sanr)
eilpitn"S ewrs cne";
sanrewrsbgn)
cneNtok.ei(;
/ cneto sae
/ oncin tt
boenntonce =tu;
ola oCnetd
re
/ SatGMsil
/ tr S hed
/ I yu SMhsPN ps i a aprmtro bgn)i qoe
/ f or I a I, as t s
aaee f ei( n uts
wientonce)
hl(oCnetd
{
i(sAcs.ei(INME)=S_ED)
fgmcesbgnPNUBR=GMRAY
ntonce =fle
oCnetd
as;
es
le
{
Sra.rnl(Ntcnetd)
eilpitn"o once";
dly10)
ea(00;
}
}
/ gtmdmprmtr
/ e oe aaees
/ IE,mdmuiu ietfe
/ MI oe nqe dniir
Sra.rn(MdmIE:";
eilpit"oe MI )
IE =mdmetgtMI)
MI
oeTs.eIE(;
IE.elc("")
MIrpae"n,";
i(MI! NL)
fIE = UL
Sra.rnl(MI;
eilpitnIE)
/ cretycnetdcrir
/ urnl once are
Sra.rn(Cretcrir ";
eilpit"urn are: )
Sra.rnl(cneNtok.eCretare()
eilpitnsanrewrsgturnCrir);

}

/ rtrssrnt adbr
/ eun tegh n e
/ sga srnt i 03 sae 3 maspwr>5dm
/ inl tegh n -1 cl. 1 en oe
1B
/ BRi teBtErrRt.07sae 9=o dtcal
/ E s h i ro ae - cl. 9nt eetbe
Sra.rn(Sga Srnt:";
eilpit"inl tegh )
Sra.rn(cneNtok.eSgaSrnt()
eilpitsanrewrsgtinltegh);
Sra.rnl( [-1";
eilpitn" 03])

vi lo(
od op)
{
/ sa freitn ntok,dsly als o ntok
/ cn o xsig ewrs ipas
it f ewrs
Sra.rnl(Sann aalbentok.Mytk sm scns";
eilpitn"cnig vial ewrs a ae oe eod.)
Sra.rnl(cneNtok.edewrs);
eilpitnsanrewrsraNtok()
/ cretycnetdcrir
/ urnl once are
Sra.rn(Cretcrir ";
eilpit"urn are: )
Sra.rnl(cneNtok.eCretare()
eilpitnsanrewrsgturnCrir);
/ rtrssrnt adbr
/ eun tegh n e
/ sga srnt i 03 sae 3 maspwr>5dm
/ inl tegh n -1 cl. 1 en oe
1B
/ BRi teBtErrRt.07sae 9=o dtcal
/ E s h i ro ae - cl. 9nt eetbe
Sra.rn(Sga Srnt:";
eilpit"inl tegh )
Sra.rn(cneNtok.eSgaSrnt()
eilpitsanrewrsgtinltegh);
Sra.rnl( [-1";
eilpitn" 03])
}
[Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=1)

Sending a SMS message
Once you have connected to your network with the sketch above, you can test some of the other functionality of the board. This
sketch will connect to a GSM network and send a SMS message to a phone number of your choosing.
#nld <S.>
icue GMh
#eiePNUBR"
dfn INME "
/ iiilz telbayisac
/ ntaie h irr ntne
GMgmces / icuea're prmtrfrdbgeald
S sAcs; / nld
tu' aaee o eu nbe
GMSSss
S_M m;
/ ca aryo tetlpoenme t sn SS
/ hr ra f h eehn ubr o ed M
/ cag tenme 1225511 t anme
/ hne h ubr -1-5-22 o
ubr
/ yuhv acs t
/ o ae ces o
ca rmtNme[0="22511"
hr eoeubr2] 115522;
/ ca aryo temsae
/ hr ra f h esg
ca tts[0]"et;
hr xMg20=Ts"
vi stp)
od eu(
{
/ iiilz sra cmuiain
/ ntaie eil omnctos
Sra.ei(60;
eilbgn90)
Sra.rnl(SSMsae Sne";
eilpitn"M esgs edr)
/ cneto sae
/ oncin tt
boenntonce =tu;
ola oCnetd
re

}

/ SatGMsil
/ tr S hed
/ I yu SMhsPN ps i a aprmtro bgn)i qoe
/ f or I a I, as t s
aaee f ei( n uts
wientonce)
hl(oCnetd
{
i(sAcs.ei(INME)=S_ED)
fgmcesbgnPNUBR=GMRAY
ntonce =fle
oCnetd
as;
es
le
{
Sra.rnl(Ntcnetd)
eilpitn"o once";
dly10)
ea(00;
}
}
Sra.rnl(GMiiilzd)
eilpitn"S ntaie";
snSS)
edM(;

vi lo(
od op)
{
/ ntigt sehr
/ ohn o e ee
}
vi snSS)
od edM({
Sra.rn(Msaet mbl nme:";
eilpit"esg o oie ubr )
Sra.rnl(eoeubr;
eilpitnrmtNme)
/ sstx
/ m et
Sra.rnl(SNIG)
eilpitn"EDN";
Sra.rnl(;
eilpitn)
Sra.rnl(Msae";
eilpitn"esg:)
Sra.rnl(xMg;
eilpitntts)

}

/ sn temsae
/ ed h esg
ssbgnM(eoeubr;
m.eiSSrmtNme)
sspittts)
m.rn(xMg;
ssedM(;
m.nSS)
Sra.rnl(CMLT!n)
eilpitn"nOPEE";

[Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=2)

Connecting to the internet
In addition to the SIM card and a data plan, you will need some additional information from your cellular provider to connect to the
internet. Every cellular provider has an Access Point Name (APN) that serves as a bridge between the cellular network and the
internet. Sometimes, there is a username and password associated with the connection point. For example, the Bluevia APN is
bluevia.movistar.es, but it has no password or login name.
This page (http://forums.pinstack.com/f24/tcp_apn_wap_gateway_port_carrier_settings-360/) lists a number of carrier's
information, but it may not be up to date. You may need to get this information from your service provider.
The sketch below will connect to arduino.cc/latest.txt and print out its contents.
NB: Some network operators block incoming IP traffic. You should be able to run client functions, such as the sketch below, with no
issues.
/ icueteGMlbay
/ nld h S irr
#nld <S.>
icue GMh
/ PNnme i ncsay
/ I ubr f eesr
#eiePNUBR"
dfn INME "
/ ANifrainorie fo yu ntokpoie
/ P nomto band rm or ewr rvdr
#eieGR_P
dfn PSAN
"PSAN / rpaewt yu GR AN
GR_P" / elc ih or PS P
#eieGR_OI
dfn PSLGN
"oi"
lgn
/ rpaewt yu GR lgn
/ elc ih or PS oi
#eieGR_ASOD "asod / rpaewt yu GR pswr
dfn PSPSWR
pswr" / elc ih or PS asod
/ iiilz telbayisacs
/ ntaie h irr ntne
GMletcin;
SCin let
GR gr;
PS ps
GMgmces
S sAcs;
/ Ti eapedwlasteUL"tp/adioc/aettt
/ hs xml onod h R ht:/run.clts.x"
ca sre[ ="run.c;/ tebs UL
hr evr]
adioc" / h ae R
ca pt[ ="lts.x" / tept
hr ah]
/aettt; / h ah
itpr =8;/ tepr,8 frHT
n ot
0 / h ot 0 o TP
vi stp)
od eu(
{
/ iiilz sra cmuiain
/ ntaie eil omnctos
Sra.ei(60;
eilbgn90)
Sra.rnl(Satn Adiowbcin.)
eilpitn"trig run e let";
/ cneto sae
/ oncin tt
boenntonce =tu;
ola oCnetd
re
/ SatGMsil
/ tr S hed
/ ps tePNo yu SMa aprmtro gmcesbgn)
/ as h I f or I s
aaee f sAcs.ei(
wientonce)
hl(oCnetd
{
i(gmcesbgnPNUBR=GMRAY &
f(sAcs.ei(INME)=S_ED)
(psatcGR(PSAN GR_OI,GR_ASOD=GR_ED)
gr.tahPSGR_P, PSLGN PSPSWR)=PSRAY)
ntonce =fle
oCnetd
as;
es
le
{
Sra.rnl(Ntcnetd)
eilpitn"o once";
dly10)
ea(00;
}
}
Sra.rnl(cnetn..)
eilpitn"oncig.";

}

/ i yugtacneto,rpr bc vasra:
/ f o e
oncin eot ak i eil
i (letcnetsre,pr)
f cin.onc(evr ot)
{
Sra.rnl(cnetd)
eilpitn"once";
/ Mk aHT rqet
/ ae
TP eus:
cin.rn(GT";
letpit"E )
cin.rn(ah;
letpitpt)
cin.rnl( HT/.";
letpitn" TP10)
cin.rnl(;
letpitn)
}
es
le
{
/ i yudd' gtacneto t tesre:
/ f o int e
oncin o h evr
Sra.rnl(cneto fie";
eilpitn"oncin ald)
}

vi lo(
od op)
{
/ i teeaeicmn btsaalbe
/ f hr r noig ye vial
/ fo tesre,ra te adpitte:
/ rm h evr ed hm n rn hm
i (letaalbe)
f cin.vial()
{
ca c=cin.ed)
hr
letra(;
Sra.rn()
eilpitc;
}
/ i tesre' dsonce,so tecin:
/ f h evrs icnetd tp h let
i (cin.vial( & !letcnetd)
f !letaalbe) & cin.once()
{
Sra.rnl(;
eilpitn)
Sra.rnl(dsoncig";
eilpitn"icnetn.)
cin.tp)
letso(;

}

}

/ d ntigfrvroe
/ o ohn oeemr:
fr;)
o(;
;

[Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=3)

Making voice calls
Through the modem, it is possible to make voice calls. In order to speak to and hear the other party, you will need to add a speaker
and microphone.
On the underside of the shield, there are through-holes labeled M1P and M1N. These are the positive and negative voice input pins
for a microphone. The through-holes labeled S1P and S1N are the positive and negative voice output pins, to which you need to
connect a speaker.
On page 43 of the modem documentation (http://www.auroramobile.ru/content/files/pdf/queltec/m10_hd_v1.01.pdf), there is an
example voice and sound circuit that will connect to an earphone:
The following sketch allows you to place a voice call. Using the serial monitor, you can enter the remote phone number and
terminate the call. When you see the READY message, type a phone number. Make sure the serial monitor is set to send a just
newline when you press return.
#nld <S.>
icue GMh
/ PNNme
/ I ubr
#eiePNUBR"
dfn INME "
/ iiilz telbayisac
/ ntaie h irr ntne
GMgmces / icuea're prmtrfrdbgeald
S sAcs; / nld
tu' aaee o eu nbe
GMocCl vs
SVieal c;
Srn rmtNme ="; / tenme yuwl cl
tig eoeubr
"
/ h ubr o il al
ca cabfe[0;
hr hrufr2]
vi stp)
od eu(
{
/ iiilz sra cmuiain
/ ntaie eil omnctos
Sra.ei(60;
eilbgn90)
Sra.rnl(Mk VieCl";
eilpitn"ae oc al)
/ cneto sae
/ oncin tt
boenntonce =tu;
ola oCnetd
re
/ SatGMsil
/ tr S hed
/ I yu SMhsPN ps i a aprmtro bgn)i qoe
/ f or I a I, as t s
aaee f ei( n uts
wientonce)
hl(oCnetd
{
i(sAcs.ei(INME)=S_ED)
fgmcesbgnPNUBR=GMRAY
ntonce =fle
oCnetd
as;
es
le
{
}

}

Sra.rnl(Ntcnetd)
eilpitn"o once";
dly10)
ea(00;

Sra.rnl(GMiiilzd";
eilpitn"S ntaie.)
Sra.rnl(Etrpoenme t cl.)
eilpitn"ne hn ubr o al";
}
vi lo(
od op)
{
/ adayicmn caatr t teSrn:
/ d n noig hrces o h tig
wie(eilaalbe)>0
hl Sra.vial(
)
{
ca iCa =Sra.ed)
hr nhr
eilra(;
/ i i' anwie ta masyusol mk tecl:
/ f ts
eln, ht en o hud ae h al
i (nhr= 'n)
f iCa = '
{
/ mk sr tepoenme i nttoln:
/ ae ue h hn ubr s o o og
i (eoeubrlnt( <2)
f rmtNme.egh)
0
{
/ so tenme yur clig
/ hw h ubr o'e aln:
Sra.rn(Cligt :";
eilpit"aln o
)
Sra.rnl(eoeubr;
eilpitnrmtNme)
Sra.rnl(;
eilpitn)
/ Cl termt nme
/ al h eoe ubr
rmtNme.ohrra(hrufr 2)
eoeubrtCaArycabfe, 0;
/ Ceki terciigedhspce u tecl
/ hc f h eevn n a ikd p h al
i(c.ocCl(hrufr)
fvsviealcabfe)
{
Sra.rnl(Cl Etbihd Etrln t ed)
eilpitn"al salse. ne ie o n";
/ Wi frsm iptfo teln
/ at o oe nu rm h ie
wieSra.ed)='& (c.eviealtts)=AKN);
hl(eilra(!'n & vsgtocClSau(=TLIG)
/ Adhn u
/ n ag p
vshnCl(;
c.agal)
}
Sra.rnl(Cl Fnse";
eilpitn"al iihd)
rmtNme="
eoeubr";
Sra.rnl(Etrpoenme t cl.)
eilpitn"ne hn ubr o al";

}
es
le
{
Sra.rnl(Ta' toln frapoenme.Imfretn i";
eilpitn"hts o og o
hn ubr ' ogtig t)
rmtNme =";
eoeubr
"
}

}

}

}
es
le
{
/ adtelts caatrt temsaet sn:
/ d h aet hrce o h esg o ed
i(nhr='
fiCa!'r)
rmtNme + iCa;
eoeubr = nhr
}

[Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=4)

Next steps
Now that you have tested the basic functionality of the board, see the GSM library (http://arduino.cc/en/Reference/GSM) pages for
information about the library's API and additional examples. See the hardware page (http://arduino.cc/en/Main/ArduinoGSMShield)
for more information about the shield itself.
The text of the Arduino getting started guide is licensed under a Creative Commons Attribution-ShareAlike 3.0 License
(http://creativecommons.org/licenses/by-sa/3.0/). Code samples in the guide are released into the public domain.
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Arduino arduino gsm-shield .... helpful to b.tec students

  • 1. Search the Arduino Website  Arduino GSM Shield The Arduino GSM shield (http://arduino.cc/en/Main/ArduinoGSMShield) allows an Arduino board to connect to the internet, send and receive SMS, and make voice calls using the GSM library (http://arduino.cc/en/Reference/GSM). The shield will work with the Arduino Uno out of the box. The shield will work with the Mega, Mega ADK, and Leonardo boards with a minor modification (http://arduino.cc/en/Guide/GSMShieldLeonardoMega). The Due is not supported at this time. The GSM library (http://arduino.cc/en/Reference/GSM) is included with Arduino IDE 1.0.4 and later (http://arduino.cc/en/Main/Software). - What is GSM - What is GPRS - Network operator requirements - SIM cards - Notes on the Telefonica/Bluevia SIM included with the shield - Connecting the Shield - GSM Library - Testing the modem and network connection - Sending a SMS message - Connecting to the internet - Making voice calls - Next steps What is GSM GSM is an international standard for mobile telephones. It is an acronym that stands for Global System for Mobile Communications. It is also sometimes referred to as 2G, as it is a second-generation cellular netwTo use GPRS for internet access, and for the Arduino to request or serve webpages, you need to obtain the Access Point Name (APN) and a username/password from the network operator. See the information in Connecting to the Internet for more information about using the data capabilities of the shield. Among other things, GSM supports outgoing and incoming voice calls, Simple Message System (SMS or text messaging), and data communication (via GPRS). What is GPRS GPRS is a packet switching technology that stands for General Packet Radio Service. It can provide idealized data rates between 56114 kbit per second.
  • 2. A number of technologies such as SMS rely on GPRS to function. With the GSM shield, it is also possible to leverage the data communication to access the internet. Similar to the Ethernet and WiFi libraries, the GSM library allows the Arduino to act as a client or server, using http calls to send and receive web pages. Network operator requirements To access a network, you must have a subscription with a mobile phone operator (either prepaid or contract), a GSM compliant device like the GSM shield or mobile phone, and a Subscriber Identity Module (SIM) card. The network operator provides the SIM card, which contains information like the mobile number, and can store limited amounts of contacts and SMS messages. To use GPRS for internet access, and for the Arduino to request or serve webpages, you need to obtain the Access Point Name (APN) and a username/password from the network operator. See the information in Connecting to the Internet for more information about using the data capabilities of the shield. SIM cards In addition to the GSM shield and an Arduino, you need a SIM card. The SIM represents a contract with a communications provider. The communications provider selling you the SIM has to either provide GSM coverage where you are, or have a roaming agreement with a company providing GSM coverage in your location. It's common for SIM cards to have a four-digit PIN number associated with them for security purposes. Keep note of this number, as it's necessary for connecting to a network. If you lose the PIN associated with your SIM card, you may need to contact your network operator to retrieve it. Some SIM cards become locked if an incorrect PIN is entered too many times. If you're unsure of what the PIN is, look at the documentation that came with your SIM. Using a PUK (PIN Unlock Code), it is possible to reset a lost PIN with the GSM shield and an Arduino. The PUK number will come with your SIM card documentation. Look at the PIN Management (http://arduino.cc/en/Tutorial/GSMToolsPinManagement) example in the "tools" folder, bundled with the GSM library for an example of how to manage your PIN number with the PUK. There are a few different sizes of SIM cards; the GSM shield accepts cards in the mini-SIM format (25mm long and 15mm wide). Notes on the Telefonica/Bluevia SIM included with the shield The GSM shield comes bundled with a SIM from Telefonica/Bluevia that will work well for developing machine to machine (M2M) applications. It is not necessary to use this specific card with the shield. You may use any SIM that works on a network in your area. The Bluevia SIM card includes a roaming plan. It can be used on any supported GSM network. There is coverage throughout the Americas and Europe for this SIM, check the Bluevia service availability page (http://bluevia.com/en/page/tech.arduino.service) for specific countries that have supported networks. Activation of the SIM is handled by Bluevia. Detailed instructions on how to register and activate your SIM online and add credit are included on a small pamphlet (http://arduino.cc/en/uploads/Guide/GSMShield_Flyer.pdf) that comes with your shield. The SIM must be inserted into a powered GSM shield that is mounted on an Arduino for activation. These SIM card come without a PIN, but it is possible to set one using the GSM library's GSMPIN class (http://arduino.cc/en/Reference/GSMPINConstructor). You cannot use the included SIM to place or receive voice calls. You can only place and receive SMS with other SIMs on the Bluevia network. It's not possible to create a server that accepts incoming requests from the public internet. However, the Bluevia SIM will accept incoming requests from other SIM cards on the Bluevia network. For using the voice, and other functions of the shield, you'll need to find a different network provider and SIM. Operators will have different policies for their SIM cards, check with them directly to determine what types of connections are supported. Connecting the Shield If you are using an Arduino Uno, follow the instructions below. If you are using an Arduino Mega, Mega ADK, or Leonardo, you must follow these instructions (http://arduino.cc/en/Guide/GSMShieldLeonardoMega). The GSM shield is not currently supported on the Due.
  • 3. To use the shield, you'll need to insert a SIM card into the holder. Slide the metal bracket away from the edge of the shield and lift the cradle up. Insert the SIM in the plastic holder so the metal contacts are facing the shield, with the notch of the card at the top of the bracket. Slide the SIM all the way into the bracket Push the SIM to the board and slide the metal bracket towards the edge of the shield to lock it in place.
  • 4. Once the SIM is inserted, mount it on top of an Arduino board. To upload sketches to the board, connect it to your computer with a USB cable and upload your sketch with the Arduino IDE. Once the sketch has been uploaded, you can disconnect the board from your computer and power it with an external power supply.
  • 5. Digital pins 2, 3 and 7 are reserved for communication between the Arduino and modem and cannot be used by your sketches. Communication between the moden and Arduino is handled by the Software Serial library (http://arduino.cc/en/Reference/SoftwareSerial) on pins 2 and 3. Pin 7 is used for the modem reset. When the yellow status LED turns on, it means the modem is powered, and you can try connecting to the network. Developer versions of the GSM shield required you to press press the Power button on the shield for a few moments to turn the modem on. If you have an early version of the shield, and it does not turn on automatically, you can solder a jumper to the CTRL/D7 pad on the reverse side of the board, and it will turn on when an attached Arduino receives power. The shield should work in any area with GSM coverage. Before buying the shield please verify that there is this kind of coverage where you plan to use it.
  • 6. GSM Library The GSM library handles communication between Arduino and the GSM shield. The majority of functions are for managing data, voice, and SMS communication. There are also a number of utilities for managing information about the modem and the SIM card's PIN. See the library reference (http://arduino.cc/en/Reference/GSM) pages for more information and a complete set of examples. Testing the modem and network connection This sketch will check the modem's IMEI number. This number is unique to each modem, and is used to identify valid devices that can connect to a GSM network. Once the number has been read from the modem, the Arduino will print out the network carrier it is connected to, and the signal strength of the network over the serial port. / ipr teGMlbay / mot h S irr #nld <S.> icue GMh / PNNme / I ubr #eiePNUBR" dfn INME " / iiilz telbayisac / ntaie h irr ntne GMgmcestu) S sAcs(re; / icuea're prmtrfrdbgeald / nld tu' aaee o eu nbe GMcne sanrewrs SSanr cneNtok; GMoe mdmet SMdm oeTs; / Sv dt vrals / ae aa aibe Srn IE ="; tig MI " / sra mntrrsl msae / eil oio eut esgs Srn erret="RO" tig rotx ERR; vi stp) od eu( { / iiilz sra cmuiain / ntaie eil omnctos Sra.ei(60; eilbgn90) Sra.rnl(GMntok sanr) eilpitn"S ewrs cne"; sanrewrsbgn) cneNtok.ei(; / cneto sae / oncin tt boenntonce =tu; ola oCnetd re / SatGMsil / tr S hed / I yu SMhsPN ps i a aprmtro bgn)i qoe / f or I a I, as t s aaee f ei( n uts wientonce) hl(oCnetd { i(sAcs.ei(INME)=S_ED) fgmcesbgnPNUBR=GMRAY ntonce =fle oCnetd as; es le { Sra.rnl(Ntcnetd) eilpitn"o once"; dly10) ea(00; } } / gtmdmprmtr / e oe aaees / IE,mdmuiu ietfe / MI oe nqe dniir Sra.rn(MdmIE:"; eilpit"oe MI ) IE =mdmetgtMI) MI oeTs.eIE(; IE.elc("") MIrpae"n,"; i(MI! NL) fIE = UL Sra.rnl(MI; eilpitnIE) / cretycnetdcrir / urnl once are Sra.rn(Cretcrir "; eilpit"urn are: ) Sra.rnl(cneNtok.eCretare() eilpitnsanrewrsgturnCrir); } / rtrssrnt adbr / eun tegh n e / sga srnt i 03 sae 3 maspwr>5dm / inl tegh n -1 cl. 1 en oe 1B / BRi teBtErrRt.07sae 9=o dtcal / E s h i ro ae - cl. 9nt eetbe Sra.rn(Sga Srnt:"; eilpit"inl tegh ) Sra.rn(cneNtok.eSgaSrnt() eilpitsanrewrsgtinltegh); Sra.rnl( [-1"; eilpitn" 03]) vi lo( od op) { / sa freitn ntok,dsly als o ntok / cn o xsig ewrs ipas it f ewrs Sra.rnl(Sann aalbentok.Mytk sm scns"; eilpitn"cnig vial ewrs a ae oe eod.) Sra.rnl(cneNtok.edewrs); eilpitnsanrewrsraNtok() / cretycnetdcrir / urnl once are Sra.rn(Cretcrir "; eilpit"urn are: ) Sra.rnl(cneNtok.eCretare() eilpitnsanrewrsgturnCrir); / rtrssrnt adbr / eun tegh n e / sga srnt i 03 sae 3 maspwr>5dm / inl tegh n -1 cl. 1 en oe 1B / BRi teBtErrRt.07sae 9=o dtcal / E s h i ro ae - cl. 9nt eetbe Sra.rn(Sga Srnt:"; eilpit"inl tegh ) Sra.rn(cneNtok.eSgaSrnt() eilpitsanrewrsgtinltegh); Sra.rnl( [-1"; eilpitn" 03]) }
  • 7. [Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=1) Sending a SMS message Once you have connected to your network with the sketch above, you can test some of the other functionality of the board. This sketch will connect to a GSM network and send a SMS message to a phone number of your choosing. #nld <S.> icue GMh #eiePNUBR" dfn INME " / iiilz telbayisac / ntaie h irr ntne GMgmces / icuea're prmtrfrdbgeald S sAcs; / nld tu' aaee o eu nbe GMSSss S_M m; / ca aryo tetlpoenme t sn SS / hr ra f h eehn ubr o ed M / cag tenme 1225511 t anme / hne h ubr -1-5-22 o ubr / yuhv acs t / o ae ces o ca rmtNme[0="22511" hr eoeubr2] 115522; / ca aryo temsae / hr ra f h esg ca tts[0]"et; hr xMg20=Ts" vi stp) od eu( { / iiilz sra cmuiain / ntaie eil omnctos Sra.ei(60; eilbgn90) Sra.rnl(SSMsae Sne"; eilpitn"M esgs edr) / cneto sae / oncin tt boenntonce =tu; ola oCnetd re } / SatGMsil / tr S hed / I yu SMhsPN ps i a aprmtro bgn)i qoe / f or I a I, as t s aaee f ei( n uts wientonce) hl(oCnetd { i(sAcs.ei(INME)=S_ED) fgmcesbgnPNUBR=GMRAY ntonce =fle oCnetd as; es le { Sra.rnl(Ntcnetd) eilpitn"o once"; dly10) ea(00; } } Sra.rnl(GMiiilzd) eilpitn"S ntaie"; snSS) edM(; vi lo( od op) { / ntigt sehr / ohn o e ee } vi snSS) od edM({ Sra.rn(Msaet mbl nme:"; eilpit"esg o oie ubr ) Sra.rnl(eoeubr; eilpitnrmtNme) / sstx / m et Sra.rnl(SNIG) eilpitn"EDN"; Sra.rnl(; eilpitn) Sra.rnl(Msae"; eilpitn"esg:) Sra.rnl(xMg; eilpitntts) } / sn temsae / ed h esg ssbgnM(eoeubr; m.eiSSrmtNme) sspittts) m.rn(xMg; ssedM(; m.nSS) Sra.rnl(CMLT!n) eilpitn"nOPEE"; [Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=2) Connecting to the internet In addition to the SIM card and a data plan, you will need some additional information from your cellular provider to connect to the internet. Every cellular provider has an Access Point Name (APN) that serves as a bridge between the cellular network and the internet. Sometimes, there is a username and password associated with the connection point. For example, the Bluevia APN is bluevia.movistar.es, but it has no password or login name. This page (http://forums.pinstack.com/f24/tcp_apn_wap_gateway_port_carrier_settings-360/) lists a number of carrier's information, but it may not be up to date. You may need to get this information from your service provider. The sketch below will connect to arduino.cc/latest.txt and print out its contents. NB: Some network operators block incoming IP traffic. You should be able to run client functions, such as the sketch below, with no issues.
  • 8. / icueteGMlbay / nld h S irr #nld <S.> icue GMh / PNnme i ncsay / I ubr f eesr #eiePNUBR" dfn INME " / ANifrainorie fo yu ntokpoie / P nomto band rm or ewr rvdr #eieGR_P dfn PSAN "PSAN / rpaewt yu GR AN GR_P" / elc ih or PS P #eieGR_OI dfn PSLGN "oi" lgn / rpaewt yu GR lgn / elc ih or PS oi #eieGR_ASOD "asod / rpaewt yu GR pswr dfn PSPSWR pswr" / elc ih or PS asod / iiilz telbayisacs / ntaie h irr ntne GMletcin; SCin let GR gr; PS ps GMgmces S sAcs; / Ti eapedwlasteUL"tp/adioc/aettt / hs xml onod h R ht:/run.clts.x" ca sre[ ="run.c;/ tebs UL hr evr] adioc" / h ae R ca pt[ ="lts.x" / tept hr ah] /aettt; / h ah itpr =8;/ tepr,8 frHT n ot 0 / h ot 0 o TP vi stp) od eu( { / iiilz sra cmuiain / ntaie eil omnctos Sra.ei(60; eilbgn90) Sra.rnl(Satn Adiowbcin.) eilpitn"trig run e let"; / cneto sae / oncin tt boenntonce =tu; ola oCnetd re / SatGMsil / tr S hed / ps tePNo yu SMa aprmtro gmcesbgn) / as h I f or I s aaee f sAcs.ei( wientonce) hl(oCnetd { i(gmcesbgnPNUBR=GMRAY & f(sAcs.ei(INME)=S_ED) (psatcGR(PSAN GR_OI,GR_ASOD=GR_ED) gr.tahPSGR_P, PSLGN PSPSWR)=PSRAY) ntonce =fle oCnetd as; es le { Sra.rnl(Ntcnetd) eilpitn"o once"; dly10) ea(00; } } Sra.rnl(cnetn..) eilpitn"oncig."; } / i yugtacneto,rpr bc vasra: / f o e oncin eot ak i eil i (letcnetsre,pr) f cin.onc(evr ot) { Sra.rnl(cnetd) eilpitn"once"; / Mk aHT rqet / ae TP eus: cin.rn(GT"; letpit"E ) cin.rn(ah; letpitpt) cin.rnl( HT/."; letpitn" TP10) cin.rnl(; letpitn) } es le { / i yudd' gtacneto t tesre: / f o int e oncin o h evr Sra.rnl(cneto fie"; eilpitn"oncin ald) } vi lo( od op) { / i teeaeicmn btsaalbe / f hr r noig ye vial / fo tesre,ra te adpitte: / rm h evr ed hm n rn hm i (letaalbe) f cin.vial() { ca c=cin.ed) hr letra(; Sra.rn() eilpitc; } / i tesre' dsonce,so tecin: / f h evrs icnetd tp h let i (cin.vial( & !letcnetd) f !letaalbe) & cin.once() { Sra.rnl(; eilpitn) Sra.rnl(dsoncig"; eilpitn"icnetn.) cin.tp) letso(; } } / d ntigfrvroe / o ohn oeemr: fr;) o(; ; [Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=3) Making voice calls Through the modem, it is possible to make voice calls. In order to speak to and hear the other party, you will need to add a speaker and microphone.
  • 9. On the underside of the shield, there are through-holes labeled M1P and M1N. These are the positive and negative voice input pins for a microphone. The through-holes labeled S1P and S1N are the positive and negative voice output pins, to which you need to connect a speaker. On page 43 of the modem documentation (http://www.auroramobile.ru/content/files/pdf/queltec/m10_hd_v1.01.pdf), there is an example voice and sound circuit that will connect to an earphone:
  • 10. The following sketch allows you to place a voice call. Using the serial monitor, you can enter the remote phone number and terminate the call. When you see the READY message, type a phone number. Make sure the serial monitor is set to send a just newline when you press return. #nld <S.> icue GMh / PNNme / I ubr #eiePNUBR" dfn INME " / iiilz telbayisac / ntaie h irr ntne GMgmces / icuea're prmtrfrdbgeald S sAcs; / nld tu' aaee o eu nbe GMocCl vs SVieal c; Srn rmtNme ="; / tenme yuwl cl tig eoeubr " / h ubr o il al ca cabfe[0; hr hrufr2] vi stp) od eu( { / iiilz sra cmuiain / ntaie eil omnctos Sra.ei(60; eilbgn90) Sra.rnl(Mk VieCl"; eilpitn"ae oc al) / cneto sae / oncin tt boenntonce =tu; ola oCnetd re / SatGMsil / tr S hed / I yu SMhsPN ps i a aprmtro bgn)i qoe / f or I a I, as t s aaee f ei( n uts wientonce) hl(oCnetd { i(sAcs.ei(INME)=S_ED) fgmcesbgnPNUBR=GMRAY ntonce =fle oCnetd as; es le {
  • 11. } } Sra.rnl(Ntcnetd) eilpitn"o once"; dly10) ea(00; Sra.rnl(GMiiilzd"; eilpitn"S ntaie.) Sra.rnl(Etrpoenme t cl.) eilpitn"ne hn ubr o al"; } vi lo( od op) { / adayicmn caatr t teSrn: / d n noig hrces o h tig wie(eilaalbe)>0 hl Sra.vial( ) { ca iCa =Sra.ed) hr nhr eilra(; / i i' anwie ta masyusol mk tecl: / f ts eln, ht en o hud ae h al i (nhr= 'n) f iCa = ' { / mk sr tepoenme i nttoln: / ae ue h hn ubr s o o og i (eoeubrlnt( <2) f rmtNme.egh) 0 { / so tenme yur clig / hw h ubr o'e aln: Sra.rn(Cligt :"; eilpit"aln o ) Sra.rnl(eoeubr; eilpitnrmtNme) Sra.rnl(; eilpitn) / Cl termt nme / al h eoe ubr rmtNme.ohrra(hrufr 2) eoeubrtCaArycabfe, 0; / Ceki terciigedhspce u tecl / hc f h eevn n a ikd p h al i(c.ocCl(hrufr) fvsviealcabfe) { Sra.rnl(Cl Etbihd Etrln t ed) eilpitn"al salse. ne ie o n"; / Wi frsm iptfo teln / at o oe nu rm h ie wieSra.ed)='& (c.eviealtts)=AKN); hl(eilra(!'n & vsgtocClSau(=TLIG) / Adhn u / n ag p vshnCl(; c.agal) } Sra.rnl(Cl Fnse"; eilpitn"al iihd) rmtNme=" eoeubr"; Sra.rnl(Etrpoenme t cl.) eilpitn"ne hn ubr o al"; } es le { Sra.rnl(Ta' toln frapoenme.Imfretn i"; eilpitn"hts o og o hn ubr ' ogtig t) rmtNme ="; eoeubr " } } } } es le { / adtelts caatrt temsaet sn: / d h aet hrce o h esg o ed i(nhr=' fiCa!'r) rmtNme + iCa; eoeubr = nhr } [Get Code] (http://arduino.cc/en/Guide/ArduinoGSMShield?action=sourceblock&num=4) Next steps Now that you have tested the basic functionality of the board, see the GSM library (http://arduino.cc/en/Reference/GSM) pages for information about the library's API and additional examples. See the hardware page (http://arduino.cc/en/Main/ArduinoGSMShield) for more information about the shield itself. The text of the Arduino getting started guide is licensed under a Creative Commons Attribution-ShareAlike 3.0 License (http://creativecommons.org/licenses/by-sa/3.0/). Code samples in the guide are released into the public domain. Like 56 Tw eet 11 18