Cermetek 1837A DAA DTMF Problem
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Posts: 46,084
I am trying to interface the BS2p40 with a DAA 1837A from Cermetek.
The tones sound good on the phone but the phone company doesn't
recognize the tones. Are the tones generated by the BS2 noisy? Is
there anyone that has a circuit that works for this. Seems really
simple to connect using this DAA but its not working.
Troy
The tones sound good on the phone but the phone company doesn't
recognize the tones. Are the tones generated by the BS2 noisy? Is
there anyone that has a circuit that works for this. Seems really
simple to connect using this DAA but its not working.
Troy
Comments
I know virtually nothing about this.
I do know that the length of the tone can make a difference. A no
frills AT&T touch tone phone generates tones that last a certain
length of time. Some other phones only produce the tone for the
period of time that the button is depressed which in the early days
of touch tone caused some problems.
Try a longer period on your tones if you have control of that.
Good luck,
Frank
--- In basicstamps@yahoogroups.com, "Troy Bakken" <troybakken@y...>
wrote:
> I am trying to interface the BS2p40 with a DAA 1837A from
Cermetek.
> The tones sound good on the phone but the phone company doesn't
> recognize the tones. Are the tones generated by the BS2 noisy? Is
> there anyone that has a circuit that works for this. Seems really
> simple to connect using this DAA but its not working.
>
> Troy
without filtering? The manual and help file show a two-stage filter
that is required to take the output from the BASIC Stamp and shape it
into a clean sine wave.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Troy Bakken [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ywHrOQfg0N3PLFIZi6LJUp3qD8lj-s52oLdnXwyxoFPRvH0Eirmnbfc1Ro6vO3ZQsb1e4By_Nd-QkXw]troybakken@y...[/url
Sent: Saturday, April 17, 2004 12:04 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
I am trying to interface the BS2p40 with a DAA 1837A from Cermetek.
The tones sound good on the phone but the phone company doesn't
recognize the tones. Are the tones generated by the BS2 noisy? Is
there anyone that has a circuit that works for this. Seems really
simple to connect using this DAA but its not working.
Troy
2.0b shows a .001uF a 1k and a .1uF network that I have attempted to
use but it does not work. If there is a better two stage network
that someone knows works I would sure like to try it. An active
filter that is mentioned in the manual on page 109 sounds like the
best idea but I don't know what that looks like.
Thanks,
Troy
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Are you connecting the FREQOUT/DTMFOUT output pin directly to the
line
> without filtering? The manual and help file show a two-stage
filter
> that is required to take the output from the BASIC Stamp and shape
it
> into a clean sine wave.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> Sent: Saturday, April 17, 2004 12:04 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
>
>
> I am trying to interface the BS2p40 with a DAA 1837A from
Cermetek.
> The tones sound good on the phone but the phone company doesn't
> recognize the tones. Are the tones generated by the BS2 noisy?
Is
> there anyone that has a circuit that works for this. Seems really
> simple to connect using this DAA but its not working.
>
> Troy
Before you change your circuit, you may want to experiment with the on-
and off-times for the DTMF tones. Err on the side of caution (imagine
you're 100 years old dialing the phone with a frail finger -- do that in
code). I have only ever "dialed the phone" using a BASIC Stamp with an
acoustic connection (held the phone near a speaker) -- but it did work.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Troy Bakken [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=wbsl8PLaTg_FN2kcyh-HTWYGjUoPpZbuFyevzcxEpUIK211DZkSvYifmPCRwnTFHbeTNscDON5onoyR3rAqC]troybakken@y...[/url
Sent: Sunday, April 18, 2004 2:21 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Cermetek 1837A DAA DTMF Problem
What page of the manual are you refering to? Page 109 of Manual
2.0b shows a .001uF a 1k and a .1uF network that I have attempted to
use but it does not work. If there is a better two stage network
that someone knows works I would sure like to try it. An active
filter that is mentioned in the manual on page 109 sounds like the
best idea but I don't know what that looks like.
Thanks,
Troy
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Are you connecting the FREQOUT/DTMFOUT output pin directly to the
line
> without filtering? The manual and help file show a two-stage
filter
> that is required to take the output from the BASIC Stamp and shape
it
> into a clean sine wave.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> Sent: Saturday, April 17, 2004 12:04 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
>
>
> I am trying to interface the BS2p40 with a DAA 1837A from
Cermetek.
> The tones sound good on the phone but the phone company doesn't
> recognize the tones. Are the tones generated by the BS2 noisy?
Is
> there anyone that has a circuit that works for this. Seems really
> simple to connect using this DAA but its not working.
>
> Troy
To UNSUBSCRIBE, just send mail to:
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and it does work very well. Are you using the specified transformer?
Steve
Original Message
From: "Troy Bakken" <troybakken@y...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, April 18, 2004 12:21 AM
Subject: [noparse][[/noparse]basicstamps] Re: Cermetek 1837A DAA DTMF Problem
> What page of the manual are you refering to? Page 109 of Manual
> 2.0b shows a .001uF a 1k and a .1uF network that I have attempted to
> use but it does not work. If there is a better two stage network
> that someone knows works I would sure like to try it. An active
> filter that is mentioned in the manual on page 109 sounds like the
> best idea but I don't know what that looks like.
>
> Thanks,
>
> Troy
>
> --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
> wrote:
> > Are you connecting the FREQOUT/DTMFOUT output pin directly to the
> line
> > without filtering? The manual and help file show a two-stage
> filter
> > that is required to take the output from the BASIC Stamp and shape
> it
> > into a clean sine wave.
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Dallas Office
> >
> >
> >
Original Message
> > From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> > Sent: Saturday, April 17, 2004 12:04 AM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
> >
> >
> > I am trying to interface the BS2p40 with a DAA 1837A from
> Cermetek.
> > The tones sound good on the phone but the phone company doesn't
> > recognize the tones. Are the tones generated by the BS2 noisy?
> Is
> > there anyone that has a circuit that works for this. Seems really
> > simple to connect using this DAA but its not working.
> >
> > Troy
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
separated by a 10-30 millisecond interval in between is sufficient. These
numbers actually depend on the switch that your line is connected to more
than anything else ; some older switches don't signal as fast, etc.
On Sun, 18 Apr 2004, Jon Williams wrote:
> Troy,
>
> Before you change your circuit, you may want to experiment with the on-
> and off-times for the DTMF tones. Err on the side of caution (imagine
> you're 100 years old dialing the phone with a frail finger -- do that in
> code). I have only ever "dialed the phone" using a BASIC Stamp with an
> acoustic connection (held the phone near a speaker) -- but it did work.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: Troy Bakken [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=UFLhUqO9c2Y94axHFz_qiyj3ipp37mZIiBOm_IZdeDBSzlPc2UrCqBqVpyHkeFNIkH14armMoBqkNnjH]troybakken@y...[/url
> Sent: Sunday, April 18, 2004 2:21 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Re: Cermetek 1837A DAA DTMF Problem
>
>
> What page of the manual are you refering to? Page 109 of Manual
> 2.0b shows a .001uF a 1k and a .1uF network that I have attempted to
> use but it does not work. If there is a better two stage network
> that someone knows works I would sure like to try it. An active
> filter that is mentioned in the manual on page 109 sounds like the
> best idea but I don't know what that looks like.
>
> Thanks,
>
> Troy
>
> --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
> wrote:
> > Are you connecting the FREQOUT/DTMFOUT output pin directly to the
> line
> > without filtering? The manual and help file show a two-stage
> filter
> > that is required to take the output from the BASIC Stamp and shape
> it
> > into a clean sine wave.
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Dallas Office
> >
> >
> >
Original Message
> > From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> > Sent: Saturday, April 17, 2004 12:04 AM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
> >
> >
> > I am trying to interface the BS2p40 with a DAA 1837A from
> Cermetek.
> > The tones sound good on the phone but the phone company doesn't
> > recognize the tones. Are the tones generated by the BS2 noisy?
> Is
> > there anyone that has a circuit that works for this. Seems really
> > simple to connect using this DAA but its not working.
> >
> > Troy
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject
> and Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> This message has been scanned by WebShield. Please report SPAM to
> abuse@p....
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"Do not fear mistakes, There Are None" - Miles Davis
--- In basicstamps@yahoogroups.com, "Stephen H Chapman"
<chapman@t...> wrote:
> The circuit on page 109 of the Basic Stamp Manual, Version 2.0 is
correct
> and it does work very well. Are you using the specified
transformer?
> Steve
>
Original Message
> From: "Troy Bakken" <troybakken@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Sunday, April 18, 2004 12:21 AM
> Subject: [noparse][[/noparse]basicstamps] Re: Cermetek 1837A DAA DTMF Problem
>
>
> > What page of the manual are you refering to? Page 109 of Manual
> > 2.0b shows a .001uF a 1k and a .1uF network that I have
attempted to
> > use but it does not work. If there is a better two stage network
> > that someone knows works I would sure like to try it. An active
> > filter that is mentioned in the manual on page 109 sounds like
the
> > best idea but I don't know what that looks like.
> >
> > Thanks,
> >
> > Troy
> >
> > --- In basicstamps@yahoogroups.com, "Jon Williams"
<jwilliams@p...>
> > wrote:
> > > Are you connecting the FREQOUT/DTMFOUT output pin directly to
the
> > line
> > > without filtering? The manual and help file show a two-stage
> > filter
> > > that is required to take the output from the BASIC Stamp and
shape
> > it
> > > into a clean sine wave.
> > >
> > > -- Jon Williams
> > > -- Applications Engineer, Parallax
> > > -- Dallas Office
> > >
> > >
> > >
Original Message
> > > From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> > > Sent: Saturday, April 17, 2004 12:04 AM
> > > To: basicstamps@yahoogroups.com
> > > Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
> > >
> > >
> > > I am trying to interface the BS2p40 with a DAA 1837A from
> > Cermetek.
> > > The tones sound good on the phone but the phone company doesn't
> > > recognize the tones. Are the tones generated by the BS2 noisy?
> > Is
> > > there anyone that has a circuit that works for this. Seems
really
> > > simple to connect using this DAA but its not working.
> > >
> > > Troy
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
doesn't recognize them at all. I even built the circuit on page 109
and it still doesn't work. I know that I am missing something. I
am going to get out the scope and look at waveforms and levels
tomorrow. There is something wrong with this.
Troy
--- In basicstamps@yahoogroups.com, "Sean T. Lamont .lost."
<lamont@a...> wrote:
>
> I work with DTMF dialers a bit, and usually 20-50 millisecond tone
pulse
> separated by a 10-30 millisecond interval in between is
sufficient. These
> numbers actually depend on the switch that your line is connected
to more
> than anything else ; some older switches don't signal as fast, etc.
>
> On Sun, 18 Apr 2004, Jon Williams wrote:
>
> > Troy,
> >
> > Before you change your circuit, you may want to experiment with
the on-
> > and off-times for the DTMF tones. Err on the side of caution
(imagine
> > you're 100 years old dialing the phone with a frail finger -- do
that in
> > code). I have only ever "dialed the phone" using a BASIC Stamp
with an
> > acoustic connection (held the phone near a speaker) -- but it
did work.
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Dallas Office
> >
> >
> >
Original Message
> > From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> > Sent: Sunday, April 18, 2004 2:21 AM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Re: Cermetek 1837A DAA DTMF Problem
> >
> >
> > What page of the manual are you refering to? Page 109 of Manual
> > 2.0b shows a .001uF a 1k and a .1uF network that I have
attempted to
> > use but it does not work. If there is a better two stage network
> > that someone knows works I would sure like to try it. An active
> > filter that is mentioned in the manual on page 109 sounds like
the
> > best idea but I don't know what that looks like.
> >
> > Thanks,
> >
> > Troy
> >
> > --- In basicstamps@yahoogroups.com, "Jon Williams"
<jwilliams@p...>
> > wrote:
> > > Are you connecting the FREQOUT/DTMFOUT output pin directly to
the
> > line
> > > without filtering? The manual and help file show a two-stage
> > filter
> > > that is required to take the output from the BASIC Stamp and
shape
> > it
> > > into a clean sine wave.
> > >
> > > -- Jon Williams
> > > -- Applications Engineer, Parallax
> > > -- Dallas Office
> > >
> > >
> > >
Original Message
> > > From: Troy Bakken [noparse][[/noparse]mailto:troybakken@y...]
> > > Sent: Saturday, April 17, 2004 12:04 AM
> > > To: basicstamps@yahoogroups.com
> > > Subject: [noparse][[/noparse]basicstamps] Cermetek 1837A DAA DTMF Problem
> > >
> > >
> > > I am trying to interface the BS2p40 with a DAA 1837A from
> > Cermetek.
> > > The tones sound good on the phone but the phone company doesn't
> > > recognize the tones. Are the tones generated by the BS2 noisy?
> > Is
> > > there anyone that has a circuit that works for this. Seems
really
> > > simple to connect using this DAA but its not working.
> > >
> > > Troy
> >
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject
> > and Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> > This message has been scanned by WebShield. Please report SPAM to
> > abuse@p...
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
> Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc.
(ServNet)
> Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma -
Bremerton
> email: lamont@a... WWW: http://www.serv.net
> "Do not fear mistakes, There Are None" - Miles Davis