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'[EE]:Receive DTMF'
2001\10\09@170945 by Shawn Yates

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Hello all,

       I need to make a computer receive DTMF numbers.  I can do it using a
modem (or other card in the PC) and software, or I could make a hardware box
that decodes DTMF into ASCII and sends it in the serial port.  Is either one
of these available already so I don't have to invent it?  Which would be
easier / cheaper?

Any input or thoughts appreciated.

Shawn

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2001\10\09@172638 by Lawrence Glaister

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Hi Shawn
If you would like a premade board, the hams use such an interface for
internet connected radio repeaters. Check out http://www.irlp.net. The board is
an audio interface to a radio transceiver and includes a dtmf decoder
chip that is read through the parallel port. It is not hard to build up
a decoder from the chip (Mitel mt8870de) and about 4 or 5 parts if you
want to build one.
cheers

On Tue, 2001-10-09 at 14:07, Shawn Yates wrote:
{Quote hidden}

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2001\10\10@005832 by pic list

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http://www.piclist.com/postbot.asp?id=piclist\2001\10\09\170945a


There are a number of previous threads on this
subject. Check on the archive. I have done a DTMF
project using a 16F84A and a Motorolla DTMF
transciever. The reason i used a DTMF tranciever is
because of easy interface. It is not a low cost
solution because it requires the use of a 1:1
transformer to interface to the phone line. The
transciever needs to be prior configured and it
communicates with the pic serially. There are better
tranciever by a mfr that start with the letter M****.

Since you only want to receive, try to source out
Holtek DTMF receiver or some other mfr. Usually they
are easy to use without any configuration and outputs
the detected DTMF signal equivalent binary in
parallel. You don't really need other expensive
component if you were to interface to a parellel port.
Just write a simple C++ codes to interpret and
control.

If you insist on ASCII input through Serial, then i
guess you will need a pic.

Hope this helps.

Rgds,

pang

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2001\10\10@031614 by Tsvetan Usunov

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>Hello all,
>
>        I need to make a computer receive DTMF numbers.  I can do it using
a
>modem (or other card in the PC) and software, or I could make a hardware
box
>that decodes DTMF into ASCII and sends it in the serial port.  Is either
one
>of these available already so I don't have to invent it?  Which would be
>easier / cheaper?
>
>Any input or thoughts appreciated.
>
>Shawn

We have this done with MT3271 serial DTMF decoder and PIC12C508.
http://www.olimex.com/kits check for PH002 DTMF-to-RS232 converter.

Best regards
Tsvetan
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Development boards for PIC, AVR and MSP430  (http://www.olimex.com/dev)

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2001\10\10@050015 by Alexandre Domingos F. Souza

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>If you would like a premade board, the hams use such an interface for
>internet connected radio repeaters. Check out http://www.irlp.net. The board is
>an audio interface to a radio transceiver and includes a dtmf decoder
>chip that is read through the parallel port. It is not hard to build up
>a decoder from the chip (Mitel mt8870de) and about 4 or 5 parts if you
>want to build one.

       In the audio part of http://www.epanorama.net there is a link to a program to decode DTMF using a soundcard. Does it fits the bill?


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Alexandre Souza
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http://planeta.terra.com.br/lazer/pinball/

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2001\10\10@084241 by Shawn Yates

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That kit looks like just what i need and the price is good also.  All I need
to add is something that takes the phone port off-hook whenever the phone
rings.

Thanks!!

{Original Message removed}

2001\10\10@232210 by Stephen Holland

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There is code on Ubicom's website to make an SX do this...

{Quote hidden}

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