Can the STAMP answer the Phone?
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Posts: 46,084
All,
I have an idea where I would like to have the STAMP answer the
telephone, play a short message and then disconnect.
I have access to the Phone line isolation transformers so I do not
think that the line voltages would be a problem. What I am wondering
is if the Stamp can detect the ring, go off hook, play the message
(via the Quadravox card) and them hang up?
Has anyone ever tried this?
Thanks,
Phil
PS: It would be easier to purchase a cheep answering machine but
that would not be nearly as much fun. [noparse]:)[/noparse]
I have an idea where I would like to have the STAMP answer the
telephone, play a short message and then disconnect.
I have access to the Phone line isolation transformers so I do not
think that the line voltages would be a problem. What I am wondering
is if the Stamp can detect the ring, go off hook, play the message
(via the Quadravox card) and them hang up?
Has anyone ever tried this?
Thanks,
Phil
PS: It would be easier to purchase a cheep answering machine but
that would not be nearly as much fun. [noparse]:)[/noparse]
Comments
describing to power up a FAX machine on the ringing of
the telephone line it was collected to. For my project,
I wanted to apply power to the FAX machine after the
first ring, then after the unit had a chance to power up
correctly, apply the ringing phone line to the FAX
machine. After a short period of no active phone
connection, power the whole thing off.
To detect ringing I used a cute little kit from Xanadu
Electronics, (really an AC coupled full wave bridge
driving an open collector transistor). I also used
another Xanadu kit to sense whether the line was active
(off hook detector, a really simple current sensor).
Two relays controlled power to the FAX machine and
connection of th phone line to the FAX phone input. It
was required to keep ring voltage from appearing on the
FAX machine before it was powered up completely, to
insure that the unit saw the ring voltage
I'm still using the little gadget today... a rev D Stamp
1, a few parts, all stuffed in a cute little case, with
enough I/O lines for LED's to tell you the status.
In your case, I'd look at the low cost message
recorder "semi kits" at Radio Shack (less $$$ than the
Quadravox card - unless you need high quality).
The rest is SMOP (Small Matter Of Programming)
Jim
> All,
>
> I have an idea where I would like to have the STAMP answer the
> telephone, play a short message and then disconnect.
>
> I have access to the Phone line isolation transformers so I do not
> think that the line voltages would be a problem. What I am wondering
> is if the Stamp can detect the ring, go off hook, play the message
> (via the Quadravox card) and them hang up?
>
> Has anyone ever tried this?
>
> Thanks,
> Phil
>
> PS: It would be easier to purchase a cheep answering machine but
> that would not be nearly as much fun. [noparse]:)[/noparse]
>
>
> 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.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Thanks for the ideas. I do not need the quality of the Quadrovox
and I will, hopefully, only need the setup for a couple of months so
I was trying to use what I had on hand. It may turn out to make a
lot more sense to go the radio shack route and leave the stamp for
more fun endeavors.
Phil
--- In basicstamps@y..., kvo@a... wrote:
> I crafted a little project similar to what you are
> describing to power up a FAX machine on the ringing of
> the telephone line it was collected to. For my project,
> I wanted to apply power to the FAX machine after the
> first ring, then after the unit had a chance to power up
> correctly, apply the ringing phone line to the FAX
> machine. After a short period of no active phone
> connection, power the whole thing off.
>
> To detect ringing I used a cute little kit from Xanadu
> Electronics, (really an AC coupled full wave bridge
> driving an open collector transistor). I also used
> another Xanadu kit to sense whether the line was active
> (off hook detector, a really simple current sensor).
>
> Two relays controlled power to the FAX machine and
> connection of th phone line to the FAX phone input. It
> was required to keep ring voltage from appearing on the
> FAX machine before it was powered up completely, to
> insure that the unit saw the ring voltage
>
> I'm still using the little gadget today... a rev D Stamp
> 1, a few parts, all stuffed in a cute little case, with
> enough I/O lines for LED's to tell you the status.
>
> In your case, I'd look at the low cost message
> recorder "semi kits" at Radio Shack (less $$$ than the
> Quadravox card - unless you need high quality).
>
> The rest is SMOP (Small Matter Of Programming)
>
> Jim
>
> > All,
> >
> > I have an idea where I would like to have the STAMP answer the
> > telephone, play a short message and then disconnect.
> >
> > I have access to the Phone line isolation transformers so I do
not
> > think that the line voltages would be a problem. What I am
wondering
> > is if the Stamp can detect the ring, go off hook, play the
message
> > (via the Quadravox card) and them hang up?
> >
> > Has anyone ever tried this?
> >
> > Thanks,
> > Phil
> >
> > PS: It would be easier to purchase a cheep answering machine but
> > that would not be nearly as much fun. [noparse]:)[/noparse]
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > from the same email address that you subscribed. Text in the
Subject and Body
> > of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
connected it direct to the stamp i/o pins. The ringing voltage across the
balanced line is 88 to 108 volts, 20 hertz superimposed on a -48 volt
supply. You need to detect the presence of ringing voltage first on the
balanced line and use an opto isolator to send the ring signal to the stamp,
Send that as an input signal to the stamp. Have the stamp send an output
signal to the relay associated with the line and use this relay contact to
trip the inbound ringing current. when ringing has been tripped then connect
the audio path to a 1:1 ratio transformer to what ever audio signal that you
want to send down the phone line. limit the audio signal to a level of -20
dbm . When the message is finished send a signal to the relay to release and
the line is now back to an idle state.
Hope this helps, Steve Chapman
Original Message
From: "Phil Keller" <philk@h...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, October 29, 2001 11:52 AM
Subject: [noparse][[/noparse]basicstamps] Can the STAMP answer the Phone?
> All,
>
> I have an idea where I would like to have the STAMP answer the
> telephone, play a short message and then disconnect.
>
> I have access to the Phone line isolation transformers so I do not
> think that the line voltages would be a problem. What I am wondering
> is if the Stamp can detect the ring, go off hook, play the message
> (via the Quadravox card) and them hang up?
>
> Has anyone ever tried this?
>
> Thanks,
> Phil
>
> PS: It would be easier to purchase a cheep answering machine but
> that would not be nearly as much fun. [noparse]:)[/noparse]
>
>
> 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.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
> I have an idea where I would like to have the STAMP answer the
>telephone, play a short message and then disconnect.
>
> I have access to the Phone line isolation transformers so I do not
>think that the line voltages would be a problem. What I am wondering
>is if the Stamp can detect the ring, go off hook, play the message
>(via the Quadravox card) and them hang up?
>
> Has anyone ever tried this?
>
> Thanks,
>Phil
>
>PS: It would be easier to purchase a cheep answering machine but
>that would not be nearly as much fun. [noparse]:)[/noparse]
Modems can auto-answer the phone line, and some modems have a
voice-injection feature. Check out the ch1786 module from
http://www.cermetek.com, which is available with app notes for the
BS2 from Parallax. However, I don't think the app note covers the
voice part. The modem has all of the necessary line interface and
approvals. The stamp could become part of the loop to sense the ring
signal and then to play the audio sequences into the injection port.
I haven't tried it, but would like to sometime. We just got a
request from a hang gliding club for an autoreporting weather station.
-- regards,
Tracy Allen
electronically monitored ecosystems
mailto:tracy@e...
http://www.emesystems.com