PIC to GSM

[Dennis]

Thanks Gusse :-)

Exactly the kind of info I was looking for !

I am ok with getting to the FBUS connecter under the battery, but I am not sure how to power the phone/circuit !
Phone is at 3,6 Volts , PIC circuit is running on 5 Volts that's why I asked about whether or not to power everything from the phone battery ?

I have the MAX232N, PIC's , wires cable resisitors , all thats missing is the connection method :-) ?(so far)

Any suggestions would be great

Thanks
Dennis

[Gusse]

Hi Dennis,

Power the MAX232N from same source as your PIC. That is the easiest way, I think.

Then do some small modifications to your 8210.

Audio-to-Data from 2.5mm bottom connector:
1) Solder wires to Fbus Rx/Tx pads
2) Connect wires to 2.5mm audio plug (select suitable pins, proposal below)
3) Solder GND wire to 2.5mm plug
3) Put some isolator between PWB and spring contacts

Nokia 8210 Pin-out

1 - MBus
2 - GND --> MIC(-) & EAR(-)
3 - FBus-Rx --> MIC(+)
4 - FBus-Tx --> EAR(+)
5 - VPP

Then use 2.5mm stereo plug to make your own data cable to connect PIC to 8210. I would recommend to use coaxial (shielded) cable for connection to avoid GSM TX coupling to data signals.
I hope this will help you to continue your project

Edit: Image removed, but here is the URL Nokia accessories - schematics

BR,
-Gusse-

[Dennis]

Gusse ...

Thank you so much for the excellent info :-)
It seems the images or links aren't available :-( any chance of a URL ?
It certainly will help me continue :-)

Thanks once again

Kind regards

Dennis

[Dennis]

Gusse

Is this the image you are referring to ?
http://img99.imageshack.us/img99/429...onnections.jpg
Hope that helps others too

Kind regards

Dennis

[Gusse]

Gusse

Is this the image you are referring to ?
http://img99.imageshack.us/img99/429...onnections.jpg
Hope that helps others too

Kind regards

Dennis

Yes, 2.5mm jack.

BR,
-Gusse-

[Gusse]

Hi Dennis,

Here is more detailed material for your phone modifications.
I hope you get the idea.

BR,
-Gusse-

Edit
BTW, more relevant place for this topic would be under "Schematics"

[Dennis]

Hi Gusse


Thanks very much it's all very clear now :-). I will test and post results later this week ...

Kind regards

Dennis