sim900 gsm shield users manual

Copyright 2012by e-Gizmo Mechatronix Central

All Rights ReservedGSM/GPRS Modem (Shield) Hardware Manual Page 1 of 9

GSM GPRS SHIELD/

FEATURES & SPECIFICATIONS

Industry proven SIMCOM SIM900D Module Buffered UART provides additional layer of protection 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



Major Components Presentation

Figure 1. GSM/GPRS Major Parts ID & Presentation (Top & Bottom).

Bottom

Top

We develop a GSM/GPRS modem circuit board that is compatible with Arduino or on our own version of Arduino, the gizDuino. These kinds of circuit is known as Shields, an easy to install and compatible pins that fits to gizDuino or any other Arduino compatible clones. With the power of SIM900D (the module that was used to our GSM/GPRS modem (Shield)), the utilization of SMS and voice can be initi-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 compatibility of the shield to any gizDuino compatible controllers, but the unused pins of SIM900d may yet be used because we put the uncommitted 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 connecting to a network provider. , We also attached 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.



Pin I.D. & Descriptions

Pin I.D. DescriptionRST Reset Pin

3.3V 3.3V Device Power Supply

5V 5V Device Power SupplyGND GroundGND GroundVIN 8-12V Device Power Supply

JP1 Details & Pin Assignment

Pin I.D. DescriptionA0 Analog In / Digital I/O

A1 Analog In / Digital I/O






Pin I.D. DescriptionAREF analog reference pin for the A/D Converter.

- -13 Digital I/O

12 Digital I/O11 Digital I/O10 Digital I/O9 Digital I/O8 Digital I/O


Pin I.D. Description7 Digital I/O6 Digital I/O

5 Digital I/O4 Digital I/O

3 Digital I/O / SUART mode (Transmit)

2 Digital I/O / SUART mode (Recieve) TX Digital I/O / Transmit

RX Digital I/O / Recieve


Pin I.D. DescriptionPWR Power indicator

MC2N Auxiliary positive and negative voiceband inputMC2P Auxiliary positive and negative voiceband inputMC1N Positive and negative voiceband inputMC1P Positive and negativevoiceband inputAGND Analog Ground

SP1P Positive and negative voiceband outputSP1N Positive and negative voiceband outputSP2N Auxiliary positive and negative voiceband outputSP2P Auxiliary positive and negative voiceband outputTEMP Battery temperature

VCHG Voltage input for the chargeADCO General purpose analog to digital converter

SIM900D open interfacing pin ports Details & Pin Assignment

Pin I.D. DescriptionRI Ring Indicator

DRXD Serial interface for debugging and firmware upgrade

DTXD Serial interface for debugging and firmware upgrade

CTS Clear to sendRTS Request to send

DTR Data terminal ready

DCD Data carry detectNETL Net status indicator

GPO1 Normal output port

SIM900D open interfacing pin ports Details & Pin Assignment



How to test GSM / GPRS ShieldUsing with gizDuino microcontroller

Figure 2. First, connect the gizDuino to your PC to upload the sample sketch for GSM/GPRS shield.

After connecting 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 after 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 first quotation mark insert the recievers number, and on the second quotation mark input any alphanumeric characters (it will serve as the message). After editing the codes, upload the sketch and wait until the uploading is complete and do not remove the USB cable.

Figure 3. Install the GSM/GPRS shield to the gizDuino microcontroller..

After 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 button switch approximately 1-5 seconds until the status LED indicator turn red, the Network indicator will blink fast upon turning on, wait until the blink has 2-3 seconds blink delay; it means the signal of the GSM/GPRS shield is stable. if the network indicators blink is stable press the reset button once and wait until the number indicated in the sample sketch recieve the message.

Note: the network indicator LED may take a long time before getting to a stable state depending on the networks signal, make sure that the antenna is attached for more signal strength, and the SIM card you install have load that can call or text depending on your program.



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 testing 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 application (Hyperterminal is not available in windows vista and windows 7 but it was downloadable through the internet.). Now attach all the said components needed to run and test the GSM/GPRS shield just like the illustration above (Figure 4.). After setting up all the components needed, press the power button and hold the power button until the the status LED indicator turn red (just like on how we test the shield using gizDuino microcontroller) and wait until 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>, Communications>, and finally Hyperterminal. After opening it, the connection wizard will apear and follow these steps:



GSM/GPRS Shield to PC

How to test GSM / GPRS Shield

First, enter the name of your connection

Second, Replace this with the COM port in which the GSM modemis attached to. To know which COM you used, go to

(My Computer>, Properties>, hardware tab>, DeviceManager>, Ports>).

The third step is to configure 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 figure to the left. just click the restore default button and then click OK.

And last step is typing AT Commands, type the commands indicated bellow.

Edit this field and enter the Cellphone number that will recieve the test message and press Enter

Edit this field and enter the text message, and press (CTRL+Z) to send.



How to test GSM / GPRS ShieldList of basic 'AT Commands

The characters represent a Carriage Return command. It is simply an ENTER key command on the keyboard.

Type:ATGSM Response:OK(This is just the commands previously done.)

Type:ATE1GSM 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=1GSM Response:OK(This command tells the GSM Modem to display SMS messages in the Human Read able Text Format.)

Type:AT+CMEE=2GSM Response:OK(This command lets the GSM Modem report any errors found in a read-able format.)

Type:AT+CFUN=1GSM Response:OK(This command sets all the GSM Modem functions to be available to the user.)

Type:AT+COPS=0GSM Response:OK(This command lets the GSM Modem functions choose an available net-work operator automatically. The process may take some time to com-plete, and its completion is marked by the OK response. This usually takes around 30 seconds to complete.)

Type:AT+CPASGSM Response:OK(Whenever this command is executed during the processing time from the above command, it reports on the status of the loading process. When the GSM modem is still 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 until a minute then the problem may result in the improp-er attachment of the SIM card. To remedy this, turn off the GSM modem power, carefully reattach the SIM card and check if it is properly placed, and resume with the start up process once again.)

Display SIM number: AT+CNUM

Show operator network: AT+COPS?

Show signal quality: AT+CSQ

Display an SMS message: AT+CMGR=1(If there are no messages in storage of the SIM card, it will return an Error message.)

Display all SMS messages: AT+CMGL=ALLWARNING: If there are large amounts of SMS messages in the SIM card, this command will flood your HyperTerminal with SMS messages.

Send an SMS message: AT+CMGS=SIM numberUser Message 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

Switches GSM Module power to OFF: AT+CPOWD

For more information regarding all the available commands of the GSM module, the user may refer to the SIM900D AT Command manual.

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STATUS5

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PWRKEY12

DISP_CLK13

DISP_DATA14

VRTC15

DISP_D/C16

GND17

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MIC

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D36

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Figure 5. Schematic diagram of GSM/GPRS Shield.



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 (Bottom)

sim900 gsm shield users manual

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