RE: GSM and GPRS

Guylhem

The internal RS232 port has TTL level.
The external has RS232 level shifters with +- 12V level.

Try the internal 5V supply. If you do not run PCMCIA in parallel,
it should be powerfull enough.

Regards
Walter

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf=20
> Of Guylhem
> Aznar
> Sent: Friday, April 29, 2005 8:49 PM
> To: Holger Freyther; [email protected]
> Cc: [email protected]
> Subject: Re: [Simpad-general] GSM and GPRS
>=20
>=20
> On Tuesday, 26 April 2005 at 21:18:16 (+0200), Holger Freyther wrote:
> > On Friday 22 April 2005 20:51, [email protected] wrote:
> > > Personally I don't intend to stop using my simpad soon.=20
> Now now I have
> > > bluetooth working, and sandisk 128Mb+wifi almost working,=20
> and a wavecom
> > > GSM module that's waiting on my desk :-) Moreover, having=20
> a working dual
> > > boot with wince would be an interesting challenge, or=20
> adding more memory,
> > > or tweaking the bootloader, etc.
> > Hi,
> > where do I get GSM modules from? Can one get a datasheet as well?
>=20
> The cheapest I've found is 74 euro :
> http://www.budgetcom.nl/product_info.php/products_id/34
>=20
> I recommand you purchase one, because it usually costs far much. The
> firmware can also be updated and I've got the full specs and AT
> references.  (google for DeveloperGuide-ModemModule-GSM-GPRS-RevE.pdf
> WMOi3%CB%B5%C3%F7%CA%E9.pdf or "MAN-P2B0007-0008 COMPACT_ita_ed1.pdf")
>=20
> It's sold with an antenna connector - pierce your simpad to hook this
> connector, so you can plug in an external antenna if you want.
>=20
> Ordered 2 to get a reducted rate and to try to solder it to another
> device too :-) (maybe to my zaurus 6000 sled?) Now I need to figure
> out if the simpad external serial port gives TTL (3.3V) or RS 232 (5.0
> V). opensimpad says 12V but I don't think so - will do some=20
> measurements.
>=20
> I also need to get 5v 1.2A to power the gsm module (it normally needs
> much less, but the specs says you should be able to give that for peak
> demand)
>=20
> I also have to try to find where I can hook it up, at the moment I
> have no idea. Since I rarely use IrDA, never the smartcard, and very
> little the external port (only for flash/bootloader), these are my
> candidates. The external serial port is the best candidate since
> there's also audio ports and I would like GSM voice functions as well
> as GPRS, so it may go there with a switch to toggle between functions.
>=20
> To try that, today I took my old S25 cable (I'm a big fan of siemens
> hardware :-) and soldered it to do some voltage and amperage measures
> on the external serial port.
>=20
> So you see it is a hack in its very early stages.
>=20
> Hopefully I will be able to use the simpad speaker and microphone for
> the GSM module. In the worst case, the audio will be diverted to the
> bluetooth chip after being encoded by an ADC, so that I can use a
> bluetooth headset with my "gsm simpad".
>=20
> Ideally I would be able to use both (default to internal when no
> bluetooth headset is available), but I'm not sure how to do that
> without using an hardware switch. Tille, any suggestion?
>=20
> Guylhem
>=20
> --=20
> Bien =E0 vous - Best regards,
> Guylhem P. Aznar
>=20
> --=20
> *@externe.net                                           =20
> http://externe.net
> P=E9rim=E9/Deprecated:    @oeil.qc.ca, @metalab.unc.edu,=20
> @ibiblio.org, @7un.org
> GPG: 92EB37C1 DD11C9C9 20519D01 E8FA1B11 42975AF7=20
http://externe.net/pubkey


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