How connect GSM (cellular-phone) to microcontroler, reading dial-tones and dial a phonenumbers?

[Michel]

Well I think I'll start with PIC as my first microcontrol project,
although PICAXE seems to be a nice think to! Though I have an other
question/problem:

I like to build a doorphone/door-code-lock through a GSM-phone, so
Can I hook up a GSM (cellphone) and be able to autoanswer and read in
the phone-dial-tones for remote controle? And can I call out using the
hooked-on cellphone to let me communicate with the person on my door?
Maybe with my old Nokia 6110 or Motorola Startac?

Thanks for already reading this!

PS: It seems I could not react through Google to my other post-replies
on:
"Is there a all-future build in microprocessor for a beginner?"
and "I'm looking for (cheap) easy programable little
pcb-microprocessor"
I get "Unable to retrieve message
[email protected]" !!!???
Any idea what I do wrong?

Thanks for the answers on that!

 

[Roger Lascelles]

Well I think I'll start with PIC as my first microcontrol project,
although PICAXE seems to be a nice think to! Though I have an other
question/problem:

I like to build a doorphone/door-code-lock through a GSM-phone, so
Can I hook up a GSM (cellphone) and be able to autoanswer and read in
the phone-dial-tones for remote controle? And can I call out using the
hooked-on cellphone to let me communicate with the person on my door?
Maybe with my old Nokia 6110 or Motorola Startac?

Ericsson and others make GSM nodules, with an RS232 port and the guts of a
mobile phone inside. You can plug in a microphone & speaker for analog, but
you can also do all the digital stuff through RS232 - dial numbers, answer
calls. You can also go on the internet, do Text Messaging do Data vs Voice
calls. Have a look at websites of phone companies for specs and info. I
have a feeling that some mobiles can do this via a connector. The modules
aren't too expensive.

A disadvantage of phones is you have to pay to keep a phone on the network,
just to wait for the message to unlock your door. There are short range RF
modules available which will interface to your microprocessor.

Roger

 

[Si Ballenger]

Well I think I'll start with PIC as my first microcontrol project,
although PICAXE seems to be a nice think to! Though I have an other
question/problem:

I like to build a doorphone/door-code-lock through a GSM-phone, so
Can I hook up a GSM (cellphone) and be able to autoanswer and read in
the phone-dial-tones for remote controle? And can I call out using the
hooked-on cellphone to let me communicate with the person on my door?
Maybe with my old Nokia 6110 or Motorola Startac?

I'd look at hacking one of the X10 TR16A touch tone controllers
below. It answers a phone call, and can decode touch tones. Once
it goes off hook, you probably could talk/listen to people at the
front door via a handset or mic/speaker attached to it. Probably
a lot cheaper than trying to use a cell phone.

http://www.x10.com/products/x10_tr16a.htm

 

[hamilton]

Ericsson and others make GSM nodules, with an RS232 port and the guts of a

Are these devices and services available in the US of A ???

 

[Rolavine]

Subject: Re: How connect GSM (cellular-phone) to microcontroler, reading

dial-tones and dial a phonenumbers?
From: "Roger Lascelles" [email protected]
Date: 12/22/04 6:06 PM Pacific Standard Time


Ericsson and others make GSM nodules, with an RS232 port and the guts of a
mobile phone inside. You can plug in a microphone & speaker for analog, but
you can also do all the digital stuff through RS232 - dial numbers, answer
calls. You can also go on the internet, do Text Messaging do Data vs Voice
calls. Have a look at websites of phone companies for specs and info. I
have a feeling that some mobiles can do this via a connector. The modules
aren't too expensive.

It's been a while for me, but they used to want a fortune to tell you how to
run these damn things, and then they set up a protocol that was designed just
to be hard to hack. I tried to figure out qualcomm phones system in 2001 and
gave up, sends ten thousand bytes to do the work of 2. I ended up using mos
switches to emulate the keyboard for that prototype. That was before these
modules were available though.

A disadvantage of phones is you have to pay to keep a phone on the network,
just to wait for the message to unlock your door. There are short range RF
modules available which will interface to your microprocessor.

Original posters idea of using dial tones is pretty practical. Dial tones are
properly reconstructed over the abstract digital connection so that you can use
your cell phone with services that use dial tones. A normal Hayes compatible PC
modem can read dial tones just fine and run your automation. Teltone makes some
good chips that read dial tones. You could set the phone for autoanswer, then
just read the dial tones through the headset speaker outputs. For audio you
could switch in a mic mounted outside the door. I couldn't get the autoanswer
to work when I did this project, I can't remember why, so instead I detected
the ringing noise on the fake headset speaker connection.

Kind of a neat project, good luck, I got paid for doing the one I did.

Rocky

 

[EventHelix.com]

Did you consider using a bluetooth enabled phone?

What way you could use the bluetooth interface to program
the GSM phone.

Deepa

 

[[email protected]]

...
A disadvantage of phones is you have to pay to keep a phone on the network,
just to wait for the message to unlock your door. There are short range RF
modules available which will interface to your microprocessor.

But calling without answering doesn't cost anything! ;-)

 

[[email protected]]

But calling without answering doesn't cost anything! ;-)

 

[[email protected]]

Did you consider using a bluetooth enabled phone?

Yes I have, but there no simple way to use bluetooth with a
microcontroller-chip like Pixace. Is there?