Nokia Fbus Version 01

History

Discused as a posability some time ago.. (I.e. why carn't my server text me when the power gose off) after all people use thier pc's to send sms and conect the phones to them. So it seemed logical.

A little while latter i saw a the post on hackaday "SMS Remote Control" which prompted me to renew my idea and do some googleing (I alwasy have a list of projects on the backburnner awating info to apear on the net).

So i got an old nokia and set about getting a cable.. How much? for a cable.. F##k off. So i set about building one 1 hour latter and no loss to my pocket.

I connected it to my test machine installed ubuntu (about 30mins, nice and simple) and installed gnokii and tryed to send a sms to my other halfs phone nothing happened (i was expecting the phone to beep or show some sign) so i did it again, and again, etc.. until i got a reply "stop sending me bloady messages". oops. but it worked.

So back to google and many versions of code out there talking about AT commands so i tryed them but to no joy. then i found that you need a phone with a built in modemto use AT commands and mine didn't have that nor did any of the old phones i had laying around, so how did gnokii do it?

Ok so there are AT commands, mbus, and fbus, and no pic code out there for FBus,which is what my phones work with. I then wrote a vb app to test this and also allow me to get to grips with Fbus, it is far simpular to debug than a PIC. this worked so but had to use a baud rate of 115200 which is realy fast and dosn't allow for mush code between transmites and also told me i would need to use a fast pic (20mhz)

Construction

The Circuit

The circuit is a very simple standard PIC board cpu (16F627 becuase it has a usart), crystal, ICP, reset switch, the only other bit is a MAX232 straped to the side to monitor the comunications between PIC and Phone to make it easyer for me to debug (rather than just 3 LEDS).

Code

This code is more of a example than a fully featuring code (as i feal that it would be a good base to start from for the various projects). All it dose is connect to the phone (using the sync command 0x55) then get the phone version command to confirm we have connection. After that it responsed (via interupts) to RB0 change (which sends a predefined message to a predefined number) and incomming text message (which checks the number of the sender against the predefined number sends another predefined message to the predefined number).

That is basicaly it with the base code i plan to build servel things which will either monitor, or control anything. As I write other apps I will publish more.

All you should need to do is add your predefined number and the smsc number (this can be got by sending a text message whilst monitering the comunications and extract the smsc number, or using gnokii).

Note I have not inculded a precompiled hex becuase I would not know what predefined phone number to use (and I don't fancy getting loads of strange text messages) also the prepacked sms messages are restricted to 5 char but this could be amended simply by changing the msg length bit in the Fbus_SendSMS_Start function.

oh and this is only beta code.

many thanks
calvin streeting

For more info on Fbus see

http://www.embedtronics.com/nokia/fbus.html
http://cvs.savannah.nongnu.org/viewcvs/gnokii/Docs/protocol/nk6110.txt?rev=1.32&root=gnokii&view=markup
http://wiki.gnokii.org/index.php/Protocol_description
http://www.gadgets.demon.co.uk/nokia61xx/protocol.html

04 Jan 2008 corrected pdf, i had the phone tx,rx around the wrong way (oops)

05 Jan 2008 I finaly got a more moden phone a 6020 and whilst play with it found out that there are versions of the nokia fbus protocol and thus have added that this is for version 1, but the good news (well for others) is that i am now going to write a version 2 that should include "fbus version 2" support and also i have been writing my pic code in modules using linker scripts to make them more resuable. more latter..

Last Updated (Tuesday, 16 March 2010 18:26) Written by Calvin Streeting Sunday, 07 February 2010 01:00