HELP Control Varying Resistances
I need to be able to somehow change the resistance between two
outputs. For example with P0 and P1 set as outputs, I need an
external device to see 100k between them and then with a changes of
code, make it 50k or 0. Any ideas would be greatly appreciated
because I have been scratching my head for awhile on this. Thanks.
outputs. For example with P0 and P1 set as outputs, I need an
external device to see 100k between them and then with a changes of
code, make it 50k or 0. Any ideas would be greatly appreciated
because I have been scratching my head for awhile on this. Thanks.
Comments
consigli@p... writes:
> I need to be able to somehow change the resistance between two
> outputs. For example with P0 and P1 set as outputs, I need an
> external device to see 100k between them and then with a changes of
> code, make it 50k or 0. Any ideas would be greatly appreciated
> because I have been scratching my head for awhile on this.
Dallas Semiconductor makes a variety of digital pots that you can control
very easily with SHIFTOUT.
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
my head I believe that an "audio volume knob" would do
the trick, as on a home stero. Basically I believe
that it is just a precision potentiometer with a
stepper motor attatched to it for the fine control up
and down the scale. You could build your own, but I
believe I have seen surplus for sale at Jameco or
maybe Electronic Goldmine. Going this route would
just be a matter of controlling the stepper to vary
the resistance of the pot. [noparse]:)[/noparse]
ross
--- consigli@p... wrote:
> I need to be able to somehow change the resistance
> between two
> outputs. For example with P0 and P1 set as outputs,
> I need an
> external device to see 100k between them and then
> with a changes of
> code, make it 50k or 0. Any ideas would be greatly
> appreciated
> because I have been scratching my head for awhile on
> this. Thanks.
>
>
> 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/
>
>
__________________________________________________
Do You Yahoo!?
Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
http://geocities.yahoo.com/ps/info1
your Stamp and it will change the output resistance accordingly. Plus,
you only need to use one Stamp pin. Digital pots are available through
Maxim <http://www.maxim-ic.com/>www.maxim-ic<http://www.maxim-ic.com/>.com
and others in several values. Maxim will also provide free samples for you
to try.
Tim
At 06:27 PM 11/27/2001 +0000, you wrote:
>I need to be able to somehow change the resistance between two
>outputs. For example with P0 and P1 set as outputs, I need an
>external device to see 100k between them and then with a changes of
>code, make it 50k or 0. Any ideas would be greatly appreciated
>because I have been scratching my head for awhile on this. Thanks.
>
>
>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/
through a 0 ohm or 50K ohm resistor? Do it twice and you have a solution.
There's also something like a digital volume control which can step up and
down based on control pulses.
On Tue, 27 Nov 2001, Klutch wrote:
> Perhaps there is a better solution, but off the top of
> my head I believe that an "audio volume knob" would do
> the trick, as on a home stero. Basically I believe
> that it is just a precision potentiometer with a
> stepper motor attatched to it for the fine control up
> and down the scale. You could build your own, but I
> believe I have seen surplus for sale at Jameco or
> maybe Electronic Goldmine. Going this route would
> just be a matter of controlling the stepper to vary
> the resistance of the pot. [noparse]:)[/noparse]
> ross
>
> --- consigli@p... wrote:
> > I need to be able to somehow change the resistance
> > between two
> > outputs. For example with P0 and P1 set as outputs,
> > I need an
> > external device to see 100k between them and then
> > with a changes of
> > code, make it 50k or 0. Any ideas would be greatly
> > appreciated
> > because I have been scratching my head for awhile on
> > this. Thanks.
> >
> >
> > 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/
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month.
> http://geocities.yahoo.com/ps/info1
>
> 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/
>
>
>
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
"...There's no moral, it's just a lot of stuff that happens". - H. Simpson
reset, one for the clock, and one for the data. This may work though.
--- In basicstamps@y..., Timothy Medema <timm@c...> wrote:
>
> How about a digital potentiometer? You can send it a serial value
from
> your Stamp and it will change the output resistance accordingly.
Plus,
> you only need to use one Stamp pin. Digital pots are available
through
> Maxim <http://www.maxim-ic.com/>www.maxim-ic<http://www.maxim-
ic.com/>.com
> and others in several values. Maxim will also provide free samples
for you
> to try.
>
> Tim
>
>
> At 06:27 PM 11/27/2001 +0000, you wrote:
> >I need to be able to somehow change the resistance between two
> >outputs. For example with P0 and P1 set as outputs, I need an
> >external device to see 100k between them and then with a changes of
> >code, make it 50k or 0. Any ideas would be greatly appreciated
> >because I have been scratching my head for awhile on this. Thanks.
> >
> >
> >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/