Gsm Gprs Shield

User Manual: gsm gprs shield

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© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 1 of 9
GSM GPRS SHIELD
/
FEATURES & SPECIFICATIONS
• Industry proven SIMCOM
SIM900D Module
• Buered UART provides
addional layer of protecon
• Fused power input
• On board LDO voltage regulator
• UART/SUART switch selectable
port (gizDuino)
• On board manual power switch
• SIM Card Holder
GENERAL SPECIFICATIONS
Power Input:
5V-7.5VDC @ 1.5A
I/O Interface:
UART 3.3V Logic 5V Tolerant
LED Indicators:
Power
Network
Status
PCB Dimensions:
53.5W x 69L mm
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 2 of 9
Major Components Presentation
Figure 1. GSM/GPRS Major Parts ID & Presentaon (Top & Boom).
Bottom
Top
We develop a GSM/GPRS modem circuit board that is compable with Arduino™ or on our own version of Arduino™, the gizDuino™.
These kinds of circuit is known as “Shields”, an easy to install and compable pins that ts to gizDuino™ or any other Arduino™ compable
clones. With the power of SIM900D (the module that was used to our GSM/GPRS modem (Shield)), the ulizaon of SMS and voice can be ini-
ate a remote control command from any range that the network service provider covers.
Not all the pins of sim900d was used to inline the compability of the shield to any gizDuino™ compable controllers, but the unused
pins of SIM900d may yet be used because we put the uncommied ports to each pin that is ready for interfacing and soldering. We also imple-
ment a mini SIM card slot & holder for (ISO/IEC 7810:2003, ID-000) SIM cards, that will act as the medium in connecng to a network provider. ,
We also aached 3 LED indicators for easy power, command status, & network status checking, UART – SUART switch for, a built in Antenna slot
for wider signal range, and a jamming port for controlling the power switch of the shield through codes or command.
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 3 of 9
Pin I.D. & Descriptions
Pin I.D. Descripon
RST Reset Pin
3.3V 3.3V Device Power Supply
5V 5V Device Power Supply
GND Ground
GND Ground
VIN 8-12V Device Power Supply
JP1 Details & Pin Assignment
Pin I.D. Descripon
A0 Analog In / Digital I/O
A1 Analog In / Digital I/O
A2 Analog In / Digital I/O
A3 Analog In / Digital I/O
A4 Analog In / Digital I/O
A5 Analog In / Digital I/O
JP2 Details & Pin Assignment
Pin I.D. Descripon
AREF analog reference pin for the A/D Converter.
- -
13 Digital I/O
12 Digital I/O
11 Digital I/O
10 Digital I/O
9Digital I/O
8 Digital I/O
JP3 Details & Pin Assignment
Pin I.D. Descripon
7Digital I/O
6 Digital I/O
5Digital I/O
4 Digital I/O
3 Digital I/O / SUART mode (Transmit)
2Digital I/O / SUART mode (Recieve)
TX Digital I/O / Transmit
RX Digital I/O / Recieve
JP4 Details & Pin Assignment
Pin I.D. Descripon
PWR Power indicator
MC2N Auxiliary posive and negave voiceband input
MC2P Auxiliary posive and negave voiceband input
MC1N Posive and negave voiceband input
MC1P Posive and negavevoiceband input
AGND Analog Ground
SP1P Posive and negave voiceband output
SP1N Posive and negave voiceband output
SP2N Auxiliary posive and negave voiceband output
SP2P Auxiliary posive and negave voiceband output
TEMP Baery temperature
VCHG Voltage input for the charge
ADCO General purpose analog to digital converter
SIM900D open interfacing pin ports Details & Pin Assignment
Pin I.D. Descripon
RI Ring Indicator
DRXD Serial interface for debugging and rmware upgrade
DTXD Serial interface for debugging and rmware upgrade
CTS Clear to send
RTS Request to send
DTR Data terminal ready
DCD Data carry detect
NETL Net status indicator
GPO1 Normal output port
SIM900D open interfacing pin ports Details & Pin Assignment
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 4 of 9
How to test GSM / GPRS Shield
Using with gizDuino microcontroller
Figure 2. First, connect the gizDuino to your PC to upload
the sample sketch for GSM/GPRS shield.
Aer connecng the gizDuino to your PC, open the the CD (included in purchasing the kit.) and go to ‘e-Gizmo KITS‘>’ GSM-GPRS
(Shield)’>’ Sample Arduino Sketch’>’ GSM_Shield_test’>’ GSM_Shield_test’, and aer opening the sample sketch, you need to edit some codes.
Find the line containing codes like this ( send_msg(“09232814046”, “this is the message area edit here.”); ) , on the rst quotaon mark
insert the reciever’s number, and on the second quotaon mark input any alphanumeric characters (it will serve as the message). Aer eding
the codes, upload the sketch and wait unl the uploading is complete and do not remove the USB cable.
Figure 3. Install the GSM/GPRS shield to the gizDuino
microcontroller..
Aer installing the GSM/GPRS shield to the microcontroller, put a 5 to 9V power supply to the GSM/GPRS shield, the Power status LED
Indicator should turn green upon supplying. Next install the antenna, and SIM card and switch the the ‘Serial programming switch‘ to “UART“ and
then press the ‘Power buon switch’ approximately 1-5 seconds unl the status LED indicator turn red, the Network indicator will blink fast upon
turning on, wait unl the blink has 2-3 seconds blink delay; it means the signal of the GSM/GPRS shield is stable. if the network indicator’s blink
is stable press the reset buon once and wait unl the number indicated in the sample sketch recieve the message.
Note: the network indicator LED may take a long me before geng to a stable state depending on the network’s signal, make sure that the
antenna is aached for more signal strength, and the SIM card you install have “load” that can call or text depending on your program.
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 5 of 9
GSM/GPRS Shield to PC
How to test GSM / GPRS Shield
Figure 4. A example Interface of GSM/GPS Shield
(PC to USB-UART Serial Converter to GSM/GPRS Shield)
In tesng the GSM/GPRS shield directly to you PC, we also need a 5-9V external power supply for the shield, a programming dongle
in this case we will use our USB-UART Serial TTL Converter, wires to connect the shield to the programming dongle, a SIM card, USB Cable type
‘A’ to type ‘B’, and ofcourse your PC with Hyperterminal applicaon (Hyperterminal is not available in windows vista and windows 7 but it was
downloadable through the internet.).
Now aach all the said components needed to run and test the GSM/GPRS shield just like the illustraon above (Figure 4.). Aer seng
up all the components needed, press the power buon and hold the power buon unl the the status LED indicator turn red (just like on how we
test the shield using gizDuino microcontroller) and wait unl the Network LED indicator blink normally. Now we need to open the Hyperterminal,
in opening the Hyperterminal just follow these steps (in windows XP) Click “start”>, ”All programs”>, “Accessories“>, “Communicaons“>, and
nally “Hyperterminal“. Aer opening it, the connecon wizard will apear and follow these steps:
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 6 of 9
GSM/GPRS Shield to PC
How to test GSM / GPRS Shield
First, enter the name of your connecon
Second, Replace this with the COM port in which the GSM modem
is aached to. To know which ‘COM’ you used, go to
(“My Computer”>, “Properes“>, hardware tab>, “Device
Manager”>, “Ports”>).
The third step is to congure the COM port parameters.
These parameters are the ‘Baud Rate’ or ‘Bits per second’, ‘Data bits’,
‘Parity’, ‘Stop bits’, and ‘Flow control’. Each of these must be set accord-
ing to the values found on the gure to the le. just click the restore
default buon and then click ‘OK‘.
And last step is typing ‘AT Commands’, type the commands indicated
bellow.
Edit this eld and enter the Cellphone number that will recieve
the test message and press “Enter“
Edit this eld and enter the text message, and press (CTRL+Z) to send.
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 7 of 9
How to test GSM / GPRS Shield
List of basic 'AT Commands’
The characters <CR> represent a ‘Carriage Return’ command. It is simply
an ‘ENTER’ key command on the keyboard.
Type:
AT<CR>
GSM Response:
OK
(This is just the commands previously done.)
Type:
ATE1<CR>
GSM Response:
OK
(This command tells the GSM Modem to echo the characters you type
into the Hyper Terminal, which allows the display of every character
typed.)
Type:
AT+CMGF=1<CR>
GSM Response:
OK
(This command tells the GSM Modem to display SMS messages in the
Human Read able Text Format.)
Type:
AT+CMEE=2<CR>
GSM Response:
OK
(This command lets the GSM Modem report any errors found in a read-
able format.)
Type:
AT+CFUN=1<CR>
GSM Response:
OK
(This command sets all the GSM Modem funcons to be available to
the user.)
Type:
AT+COPS=0<CR>
GSM Response:
OK
(This command lets the GSM Modem funcons choose an available net-
work operator automacally. The process may take some me to com-
plete, and its compleon is marked by the ‘OK’ response. This usually
takes around 30 seconds to complete.)
Type:
AT+CPAS<CR>
GSM Response:
OK
(Whenever this command is executed during the processing me from
the above command, it reports on the status of the loading process.
When the GSM modem is sll loading, it will respond with an ‘OK’. Oth-
erwise, if it is done it will respond ‘Ready’. If the GSM modem responds
an ‘Error’ up unl a minute then the problem may result in the improp-
er aachment of the SIM card. To remedy this, turn o the GSM modem
power, carefully reaach the SIM card and check if it is properly placed,
and resume with the start up process once again.)
Display SIM number: AT+CNUM<CR>
Show operator network: AT+COPS?<CR>
Show signal quality: AT+CSQ<CR>
Display an SMS message: AT+CMGR=1<CR>
(If there are no messages in storage of the SIM card, it will return an
‘Error’ message.)
Display all SMS messages: AT+CMGL=”ALL”<CR>
WARNING: If there are large amounts of SMS messages in the SIM card,
this command will ood your HyperTerminal with SMS messages.
Send an SMS message: AT+CMGS=”SIM number”<CR>
User Message <CTRL Z>
For example, if the user types in AT+CMGS=”09123456789” and exe-
cutes ‘ENTER’, and types in for the message ‘Hello There!’ (excluding the
apostrophes) and presses down both ‘CTRL’ and ‘Z’ simultaneously, the
GSM modem will send a ‘Hello There!’ message to the desired number.
Note that this will cost an amount of credit or load depending on the
network service provider.
Show list of all available commands: AT+CLAC<CR>
Switches GSM Module power to OFF: AT+CPOWD<CR>
For more informaon regarding all the available commands of the GSM
module, the user may refer to the SIM900D ‘AT Command’ manual.
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 8 of 9
schematic diagram
Figure 5. Schemac diagram of GSM/GPRS Shield.
© Copyright 2012
by e-Gizmo Mechatronix Central
All Rights Reserved
GSM/GPRS Modem (Shield)
Hardware Manual Page 9 of 9
PCB LAYOUT
Figure 6. GSM/GPRS Shield Silk screen layout
Figure 7. GSM/GPRS Shield Copper layout (Top) Figure 8. GSM/GPRS Shield Copper layout (Boom)

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