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PICList Thread
'[OT]: SMSing'
2001\10\13@231228 by Peter May

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Hi one and all. I have searched the my email  database and found numrous
mentions of people playing with SMS but no real mention of success stories.
I program in Delphi and have found a couple of components to add to my
applications that communicate with a phone to send and read sms messages etc
via the serial port and assume it can be done. I want to be able to do this
(as do many other apparently) from a PIC and an old phone without an
internal modem such as a Nokia 5110. I have no problems if I have to use say
an eeprom to store letters etc as one of the messages mentioned that the
text was sent as a hex type code so I figured instead of say a lot of space
in coding I would write the info to the eeprom say for each letter etc and
read it back.

However am I wasting my time? Is it at all possible?

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2001\10\14@020650 by Tsvetan Usunov

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>Hi one and all. I have searched the my email  database and found numrous
>mentions of people playing with SMS but no real mention of success
stories.
>I program in Delphi and have found a couple of components to add to my
>applications that communicate with a phone to send and read sms messages
etc
>via the serial port and assume it can be done. I want to be able to do
this
>(as do many other apparently) from a PIC and an old phone without an
>internal modem such as a Nokia 5110. I have no problems if I have to use
say
>an eeprom to store letters etc as one of the messages mentioned that the
>text was sent as a hex type code so I figured instead of say a lot of
space
>in coding I would write the info to the eeprom say for each letter etc and
>read it back.
>
>However am I wasting my time? Is it at all possible?

yes, it is possile
you have to make level shifting cable between the phone and your PIC or PC
then you have to search in Google (or your favorite search engine) for
"nokia gsm at commands"
Nokia have very nice AT commands book made as windows help file
then all you need is to find your local sms center dial number (some phones
show this number somewhere in your settings) and to start playing with the
sms at commands

Best regards
Tsvetan
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2001\10\14@022748 by Peter May

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Thanks. By the level switching cable do you mean using say a max232 chip? I
can buy a data cable for the phone complete with some basic software to send
sms's from a PC so I was going to buy the cable that way. It simply plugs
into the serial port on the PC. From there I was going to just replace the
PC with a PIC and as mentioned a MAX232

{Original Message removed}

2001\10\14@081933 by Dennis Noordsij

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On Sunday 14 October 2001 09:10, you wrote:
> Thanks. By the level switching cable do you mean using say a max232 chip? I
> can buy a data cable for the phone complete with some basic software to
> send sms's from a PC so I was going to buy the cable that way. It simply
> plugs into the serial port on the PC. From there I was going to just
> replace the PC with a PIC and as mentioned a MAX232

Hi,

here's my 2 cents worth :-)

The level shifter is to be able to communicate with the PC serial port. The
Nokia data cable you are talking about has exactly that inside it (max232 or
similar). However, if you are doing PIC <-> phone directly there is no need
to first level shift to PC serial port levels and then shift back down to
Nokia phone levels. I.e. why the mediator? Do a search on the web for
home-built Nokia data cables, and they're all very simple circuits with a
direct mapping of phone pins to serial pins with the max232 in the middle.

You should be able to connect your PIC directly to those pins, since you have
no need for the PC. Thus, no need for a max232 circuit or data cable.

Then all that's left is bit banging serial commands or using a usart if your
PIC has one.

(Someone please correct me if I'm totally wrong :-)

Goodluck, and do drop some status reports off later, a friend of mine wants
to build a similar circuit :-)

Regards,
Dennis

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2001\10\14@091959 by Peter May

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As a amtter of interest, how does everyone make a connector to plug onto the
bottom of the phone? That was the main reason for buying the cable for me?

{Original Message removed}

2001\10\14@092630 by Dennis Noordsij

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On Sunday 14 October 2001 16:01, you wrote:
> As a amtter of interest, how does everyone make a connector to plug onto
> the bottom of the phone? That was the main reason for buying the cable for
> me?

Small list:

http://fp.marknatalie.f9.co.uk/ff/make_your_own_mobile_data_cable.htm

http://www.versamart.com/Nokia5110/nokia5110datacommunication.shtml

http://www.atrox.at/datacable/contact/

And then there's http://www.google.com :-)

Goodluck
Dennis



> {Original Message removed}

2001\10\14@140259 by Tsvetan Usunov

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>The level shifter is to be able to communicate with the PC serial port.
The
>Nokia data cable you are talking about has exactly that inside it (max232
or
>similar). However, if you are doing PIC <-> phone directly there is no
need
>to first level shift to PC serial port levels and then shift back down to
>Nokia phone levels. I.e. why the mediator? Do a search on the web for
>home-built Nokia data cables, and they're all very simple circuits with a
>direct mapping of phone pins to serial pins with the max232 in the middle.
>
>You should be able to connect your PIC directly to those pins, since you
have
>no need for the PC. Thus, no need for a max232 circuit or data cable.

most cell phones use 3V  power supply so level shifter will be necessary if
your PIC works on 5V (and you don't want to blow your phone output buffer)

Best regards
Tsvetan
---
PCB prototypes for $26 at http://run.to/pcb (http://www.olimex.com/pcb)
Development boards for PIC, AVR and MSP430 (http://www.olimex.com/dev)

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2001\10\14@165015 by Peter May

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Yes I know there is a lot of diagrams for cables but I meant "How do you all
make the physical connector to fit the bottom of the phone" :-0

{Original Message removed}

2001\10\14@201713 by Alexandre Domingos F. Souza

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>Thanks. By the level switching cable do you mean using say a max232 chip? I
>can buy a data cable for the phone complete with some basic software to send
>sms's from a PC so I was going to buy the cable that way. It simply plugs
>into the serial port on the PC. From there I was going to just replace the
>PC with a PIC and as mentioned a MAX232

       MAX 3232, it uses a 3.3 volt comm port.


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2001\10\15@043426 by Bond, Peter

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> Yes I know there is a lot of diagrams for cables but I meant
> "How do you all
> make the physical connector to fit the bottom of the phone" :-0

Buy a headset adaptor (check it has all the contacts - I have a couple that
only have 3), open it up and solder to the back of the contacts.

Peter
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2001\10\15@053237 by Peter May

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Thanks all for the help provided so far. Does anyone have a link for the
format used (I believe it is called PDU) or is it HEX? Can it be produced in
a PIC?

Regards, Peter

{Original Message removed}

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