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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. 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.” |
Code and diagrams are available on his site.
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 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