Supplying power and addressing stamps up one wire
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Hi All,
I have an idea that I want to supply +12 volts up a wire to a group
of lamps that are wired in parallel to it. Each lamp will be
controlled by a basic stamp which is individually addressed to
control it's respective lamp.
Here's the problem - How do I multiplex a data signal up a wire that
is carrying 12VDC?
I have considered DTMF, but need reasonably high speed (need to be
able to address five lamps in say half a second). Another wire just
isn't an option.
Does anybody have any ideas?
Regards,
Dwain.
I have an idea that I want to supply +12 volts up a wire to a group
of lamps that are wired in parallel to it. Each lamp will be
controlled by a basic stamp which is individually addressed to
control it's respective lamp.
Here's the problem - How do I multiplex a data signal up a wire that
is carrying 12VDC?
I have considered DTMF, but need reasonably high speed (need to be
able to address five lamps in say half a second). Another wire just
isn't an option.
Does anybody have any ideas?
Regards,
Dwain.
Comments
dwainsworld@e... writes:
> Hi All,
>
> I have an idea that I want to supply +12 volts up a wire to a group
> of lamps that are wired in parallel to it. Each lamp will be
> controlled by a basic stamp which is individually addressed to
> control it's respective lamp.
>
> Here's the problem - How do I multiplex a data signal up a wire that
> is carrying 12VDC?
>
> I have considered DTMF, but need reasonably high speed (need to be
> able to address five lamps in say half a second). Another wire just
> isn't an option.
>
>
>
> Does anybody have any ideas?
>
> Regards,
>
> Dwain.
I am not real clear on what you are attempting to do? You have a series a
lamps wired in parallel. You want the stamp to control several lamps with one
output wire???
Please clarify a little/
[noparse][[/noparse]Non-text portions of this message have been removed]
> In a message dated 5/3/2003 8:09:41 PM Pacific Daylight Time,
> dwainsworld@e... writes:
>
> > Hi All,
> >
> > I have an idea that I want to supply +12 volts up a wire to a
group
> > of lamps that are wired in parallel to it. Each lamp will be
> > controlled by a basic stamp which is individually addressed to
> > control it's respective lamp.
> >
> > Here's the problem - How do I multiplex a data signal up a wire
that
> > is carrying 12VDC?
> >
> > I have considered DTMF, but need reasonably high speed (need to
be
> > able to address five lamps in say half a second). Another wire
just
> > isn't an option.
> >
> >
> >
> > Does anybody have any ideas?
> >
> > Regards,
> >
> > Dwain.
>
> I am not real clear on what you are attempting to do? You have a
series a
> lamps wired in parallel. You want the stamp to control several
lamps with one
> output wire???
>
> Please clarify a little/
Sorry, my description wasn't clear.
Basically I want to send data to stamps up a wire that has a 12VDC
rail on it, for the purpose of turning lamps on and off. So up one
wire i want to power a stamp AND send data to it from another stamp.
The data will tell the receiving stamp what lights to turn on and off.
It's a multiplexing question - how do I put a +12VDC supply rail AND
some form of communication between two stamps up just one wire?
Regards,
Dwain.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
[noparse][[/noparse]Non-text portions of this message have been removed]
I don't think you need to give up on DTMF. The tone bursts can be
quite short, and 5 could easily fit in 1/2 second. Of course, you
need a touch tone decoder at the other end in addition to the Stamp.
The Stamp can generate DTMF but not decode it.
Alternatively, you could use a cheap LM567 single tone decoder, and
send a simple ascii codes as tone pulses. The "detect" output from
the LM567 goes into a stamp pin. The message could be encoded as
ascii at 2400 baud or as pulse length. That is about 50 milliseconds
per message, within your 5/second requirement. If you use good
communications cable, you could get much faster transmission speeds
at higher tone frequencies.
Another option would be X-10 protocol, but the while the Stamp has an
Xout command, it does not have X-in, so you would need a decoder for
that, too.
-- Tracy
>Hi All,
>I have an idea that I want to supply +12 volts up a wire to a group
>of lamps that are wired in parallel to it. Each lamp will be
>controlled by a basic stamp which is individually addressed to
>control it's respective lamp.
>Here's the problem - How do I multiplex a data signal up a wire that
>is carrying 12VDC?
>I have considered DTMF, but need reasonably high speed (need to be
>able to address five lamps in say half a second). Another wire just
>isn't an option.
>Does anybody have any ideas?
>Regards,
>Dwain.
I have been away.
Looks like the LM567 is the go, have a few in the post coming my way as we
speak.
Regards,
Dwain.
Original Message
From: "Tracy Allen" <tracy@e...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, May 05, 2003 4:19 AM
Subject: Re: [noparse][[/noparse]basicstamps] Supplying power and addressing stamps up one wire
> Hi Dwain,
>
> I don't think you need to give up on DTMF. The tone bursts can be
> quite short, and 5 could easily fit in 1/2 second. Of course, you
> need a touch tone decoder at the other end in addition to the Stamp.
> The Stamp can generate DTMF but not decode it.
>
> Alternatively, you could use a cheap LM567 single tone decoder, and
> send a simple ascii codes as tone pulses. The "detect" output from
> the LM567 goes into a stamp pin. The message could be encoded as
> ascii at 2400 baud or as pulse length. That is about 50 milliseconds
> per message, within your 5/second requirement. If you use good
> communications cable, you could get much faster transmission speeds
> at higher tone frequencies.
>
> Another option would be X-10 protocol, but the while the Stamp has an
> Xout command, it does not have X-in, so you would need a decoder for
> that, too.
>
> -- Tracy
>
>
>
>
> >Hi All,
> >I have an idea that I want to supply +12 volts up a wire to a group
> >of lamps that are wired in parallel to it. Each lamp will be
> >controlled by a basic stamp which is individually addressed to
> >control it's respective lamp.
> >Here's the problem - How do I multiplex a data signal up a wire that
> >is carrying 12VDC?
> >I have considered DTMF, but need reasonably high speed (need to be
> >able to address five lamps in say half a second). Another wire just
> >isn't an option.
> >Does anybody have any ideas?
> >Regards,
> >Dwain.
>
>
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