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 In the microcontroller world some things are a bit tricky to do without some help. This can be some code libraries that help us talk to an LCD display, or communicate via some of the new serial protocols such as one wire. Elektronika.ba has done some work to help everyone out who wants to interface a microcontroller to a GSM phone. Thanks for making the English version for us.  Code and diagrams are available on his site.
"This device acts as interface between your microcontroller project and a GSM phone. It handles all modem data communication between the GSM phone and your micro-project. The best thing is that it decodes PDU into TEXT on the fly! It’s based on PIC16F877A microcontroller running on 16MHz at 5V. It has an onboard level converter for serial communication with the gsm phone because PIC’s UART RX input pin has a Schmitt trigger triggering at 4,5 - 5V while the phone is sending only approx. 3V from it’s TX pin. It also has a zener diode at TX pin so it doesn’t kill the phone’s network connection when talking to it. Firmware is 100% written in MPASM assembler."
Thanks Mure.
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May 7th, 2007
I think I can use this
We have a ham radio repeater with no POTS available for remote management 
May 7th, 2007
nice project!
May 7th, 2007
Maybe it would be better for you to use TwoWay Thing (from the same website), in that case you don’t need to do any developing of your own sms controller. TwoWay Thing is allready a finished sms controller, this SMS Box is an interface for the controller you are about to develop.
May 7th, 2007
wuh,
Can you show me a direct link to it? I can’t read the language.
May 7th, 2007
This is great! it’s exactly what I need to read a remote sensor (it’s about 16km far), I will try to do something similar when I have time
May 7th, 2007
The second link is a direct link to the English version.
http://www.elektronika.ba/projekti/?akc=daj_projekt&idprojekt=9
May 7th, 2007
Thanks Alan. I am still thinking it is best to just use the one GSM module…since I will be dialing into the device in question anyway, and I want to be able to dial in to it from anywhere. Basically, there is already a onboard 4 pin POTS line jack on the back of the repeater. I need to emulate what goes in between that jack and the dial in user. Any other ideas?
May 7th, 2007
awesome, thnx for the english version
May 7th, 2007
That is a beautiful circuit layout
May 7th, 2007
PCB’s always amaze me, the circuits are so nice lookin.
May 7th, 2007
You know gang, with a little practice, you, too, can make PCB’s like that
May 8th, 2007
Here is the direct link to another version http://www.elektronika.ba/projekti/?akc=daj_projekt&idprojekt=6
. There is an english version at the middle of the page after the magazine picture.
May 8th, 2007
Superb piece of work, many thanks to the author
May 8th, 2007
wuh,
Thanks a bunch for getting me that reference!
May 8th, 2007
Great project. Here is a link to someone doing the same thing but with an AVR. http://www.riccibitti.com/tinyplanet/tiny_article.htm
August 8th, 2007
we are doing same project but i am not getting its pdf file,please help me
August 30th, 2007
hello i m a finl yr engg student . i want to make a project on home security using gsm . i want that security msg come at our mobile phone automatically can you help me i m very thankful to you
August 30th, 2007
Hi vipin,
Sounds like a nice project. Send me a link when you are done.
To contact the developer of this project click on the link in the article.
September 11th, 2007
Here I am, contact me through this link http://www.elektronika.ba/kontakt
November 29th, 2007
hi,how can i have a schematic.
telecom.eng from tanzania
February 20th, 2008
plz hwo to input the program to hard ware
February 20th, 2008
Hi Paul,
The microcontroller used is a PIC chip. To program these you need a PIC programmer, they are very common. Look up this search for many examples. Good luck!
http://www.google.com/search?sourceid=mozclient&ie=utf-8&oe=utf-8&q=PIC16F877A++programmer
March 5th, 2008
hi dear!
i appreciate ur hard work on this good site..
actually i m student of final year electrical engg n the fina year project i chose,to present
to my university,is “Home security system via SMS by GSM”..
plz help me with schematic/circuit diagrams ,components to be used and other details
of this project..
i’ll be too much thankful to u..
plz send helpful information on my email address…
thanks a lot..
March 11th, 2008
hi
i need help
i need a C programm to send and recive SMS with PIC16F877
March 15th, 2008
please send c code file for microcontroller and mobile interface
July 22nd, 2008
please send c code file for microcontroller and gsm modem interface. i am using atmega8 for interfacing
July 24th, 2008
Nice project, i want to do it with 8051 Microcontroller.
November 16th, 2008
hi
i need help please
i need a C programm to send and receive SMS with PIC16F877
November 23rd, 2008
hi
i have now a project that is to control a car via sending an sms
to it ,the project using pic 16f877
so if any help you can do about the programming and the hardware connections
any info will be helpful
thank you
December 10th, 2008
New URL for this project is: http://www.elektronika.ba/563/sms-box-project/
December 10th, 2008
Thanks, I have updated the link.
December 26th, 2008
Sir,
i want to make sms base device switching system .
I want to your help sir.
thanking you
January 3rd, 2009
Sir, Iam doing II.M.Sc Applied electronics.
sir i want details about how to interface the mobile by using pic or 8051 controller .
Can you help me please………..
i want the concept of interfacing the mobile….
Can you tell the interfacing(by using any mobile.)and the cable details……….
My Project Titile are Locker Security System with Mobile Alert(this alerting are may be anything….SMS or CALL).
January 15th, 2009
Hello Subrata. First try to communicate between the PC and Phone to understand how the phone communicates. Then try 8051
good luck
January 17th, 2009
sir, i am hobbies to develope the electroinics projests
please provide me more information on the device switching through sms.
i request u the provide relevant information to complete this project which i have started long back and not yet completed , i am feeling very uncomfortable in fount of my colleges.
April 1st, 2009
I am a final year student of electrical engineering, in my final project, I am going to send sms using any type of micro controller using gsm modem or a mobile phone. Please give me the required micro controller and its code (how to program it) thank you!
April 1st, 2009
Hi Shepi,
For more details please click on the link in the article.
April 14th, 2009
hi
I’am rihab , please helpe me to going to send sms and mms using in pic16F877 in to GSM portable in language assembleur please .
April 17th, 2009
hello i’m a student who wants to build a sms tray box but i want to biuld it with microcontroller type ATMEL AT89S52.what should i do???
please for the help….
thanx before
April 17th, 2009
Hi,sir i am going to do an iphone receiving sms(command)which can interface with PIC system
to control overow house system? can you help me on this?
July 15th, 2009
my project is send sms to send sms from PIC by using GSM modem.
But, i dont know how yo write program.
From what i read, i need to use Hyperterminal and AT Command..
But for PIC 16F84A, what language, software and compiler can i used..
Plz help me …
July 20th, 2009
thanks for some information! we’ll really need it sooner for our research project..
July 20th, 2009
Hi Nisa,
Please click on the link in the article for additional details.
October 13th, 2009
im doing the project on home security automation system so i want to interface sms module to PIC16F877 please help me with sms module circuit.
October 19th, 2009
nice project.
November 16th, 2009
how GSM modem communicate with
piC16F877A using serial communication RS232