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PICList Thread
'send DTMF tones'
1999\10\24@145708 by Duilio Foschi

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Using an external modem, I need to do the following things:

1. dial a number
2. detect if the call is answered
3. send DTMF tones to the remote phone

I can do 1. with the command ATDT...
I can do 2. detecting when the ringback signal stops

I don't know how to do 3.

Any hint ?

Thank you

Duilio Foschi

1999\10\24@150539 by Dan Tye

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there is an appnote on uchip's website on producing DTMF from a pic, but I
use a tel-tone device (m-8880) to do DTMF send and receive and it works
quite well

-dan

-----Original Message-----
From: Duilio Foschi [spam_OUTfoschidTakeThisOuTspamSHUTTLE.ETRURIA.NET]
Sent: Sunday, October 24, 1999 2:56 PM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: send DTMF tones


Using an external modem, I need to do the following things:

1. dial a number
2. detect if the call is answered
3. send DTMF tones to the remote phone

I can do 1. with the command ATDT...
I can do 2. detecting when the ringback signal stops

I don't know how to do 3.

Any hint ?

Thank you

Duilio Foschi

1999\10\24@154109 by Byron A Jeff

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>
> Using an external modem, I need to do the following things:
>
> 1. dial a number
> 2. detect if the call is answered
> 3. send DTMF tones to the remote phone
>
> I can do 1. with the command ATDT...
> I can do 2. detecting when the ringback signal stops
>
> I don't know how to do 3.

Sending DTMF is just like dialing, you can use an ATDT. Instead of doing 2)
though you can simply put a bunch of commas between the dial and the
DTMF tones you want to send so:

ATDT8005551212,,,,,,,,,,,,,1234567

Should accompish the task. This is what I used to do to automatically send
pager messages. Worked like a champ.

BAJ

1999\10\24@164944 by Steve

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I assume you are going to detect the answering of the call somehow external
to the modem?  One suggestion I would have is to append a semicolon (I
think - Check your modem manual) to the dial string because it will return
it to command mode after dialing, so that you can then send another ATDT
command once you have detected the call being answered.  If you don't, then
the next character you send to the modem will cause the modem to hang up
unless it has already received carrier.

-Steve

{Original Message removed}

1999\10\26@103334 by eplus1

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see:
http://www.rt66.com/dthomas/pic/dtmf.txt

and other links at

http://204.210.50.240/techref/default.asp?url=pots.htm under "See also" and
"DTMF"

James Newton jamesnewtonspamKILLspamgeocities.com phone:1-619-652-0593
http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)
PICLIST guide: http://204.210.50.240/techref/default.asp?url=piclist.htm


{Original Message removed}

1999\10\27@051232 by Don McKenzie

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> Using an external modem, I need to do the following things:
>
> 1. dial a number
> 2. detect if the call is answered
> 3. send DTMF tones to the remote phone
>
> I can do 1. with the command ATDT...
> I can do 2. detecting when the ringback signal stops
>
> I don't know how to do 3.
>
> Any hint ?
>
> Thank you
>
> Duilio Foschi

http://www.dontronics.com/stamp.html#pager
should help you out

Don McKenzie  .....donKILLspamspam.....dontronics.com http://www.dontronics.com

Don's Download Dungeon:   http://www.dontronics.com/download.html
Australian Electronics Ring http://www.dontronics.com/aering.html
Win $500USD Cash. Micro design contest:  http://www.simmstick.com

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