GSM GLOBAL SERVICE FOR MOBILE COMMUNICATION

GSM IS NOTHING BUT GLOBAL SYSTEM FOR MOBILE COMMUNICATION.

GSM SIM 800A:

HIGHLY MODERN GSM.MOST POPULAR AND ADVANCED GSM

CONNECTION BETWEEN GSM AND ARDUINO:

WHENEVER WE WANT TO CONNECT THE GSM TO ARDUINO IS QUITE SIMPLE WHY BECAUSE WE HAVE TO MADE ONLY THREE CONNECTIONS.

THEY ARE:[TX AND RX AND GROUND]

GSM IS AN INTERNATION STANDARD;

THERE ARE SEVERAL GSM MODULUS SIM900,SIM 800A,SIM 808,GSM 520 etc,

also, there are several subcategories in the above modules.

NOTE:

the sim 800A can send or receive data over GPRS, send or receive SMS, and voice calls.

it can communicate with pc or microcontroller.

AT commands are the main communication commands to all gsm modules.

AT means attention commands.

specifications of gsm 800a:

it operates on quad-band 850/1900 MHz.

weight around 40grams.

current must be more than 1 ampere.

supply voltage range 5v-20v.

it can hold the sim card.

two LEDs are used in it, one is for network led and the other is for ring led.

the above-mentioned specifications are similar to max gsm modules.

gsm 900:

it is an upgraded version comparing to the old version.

it is a quad-band version and also dual-band versions are available in the market. (sim 900A and sim 900D)

gsm 800:

the gsm 800 is a quad-band version and also 800c,800l,800f,868 every subcategory is specialized with the new application.

like Bluetooth, FM, dual sim.

a two-channel antenna is interfaced with gsm 800.

configured with MP1482 IC high efficiency.

rs232 pin interface for serial communication.

and also interfaced with a Bluetooth antenna and large tantalum capacitor.

note:

gsm modules take some time to connect to the network. whenever it connected to the network the status led's are blinking every 3 seconds.

following are the AT commands:

ATD: DIAL COMMAND

ATDL: RE DAIL COMMAND

ATA: ANSWER THE CALL

ATH: HANG UP THE CALL

ATO: RETURN TO ONLINE DATA STATE

AT+CMGF=1 /* SET THE GSM MODULE IN TEXT MODE */

AT+CMGS=\"+91**********\"\r //IN PUT IS THE MOBILE NUMBER,THE MESSAGE IS STOPPING CHARCTER.

CTRL+Z

AT+CNMI=2,2,0,0,0 //AT COMMAND TO RECEIVE LIVE SMS

AT+COPS= /*TO KNOW YOUR OPERATOR*/

AT+CMGL="ALL" /*READ ALL MESSAGES*/

AT+CMGR=1/*READ ONLY FIRST*/

AT+CMGR=X/*READ ONLY X NUMBER MESSAGE*/

AT+CMGD=X/*DELETE X NUMBER MESSAGE*/

the global system for mobile communication modules is now causing the main role in the technical market.

we can do wonders with a combination of global systems for mobile communication and Arduino. with the help of these,

we can make automated and semi-automated work like GPRS controlling of vehicles and location sharing, texting, to know the

present status. mostly these applications are widely using in the automobile and projects works like railway and many others.

these modules are available cheap to buy and huge use. these are widely available in the online markets.

note: miss-use of these applications causes a lot of punishments in society.