PressureSensor-another possibility
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Posts: 46,084
> Interesting comment. Visual representation of pressure could be
> brightness, but that is often relative to the ambient lighting.
> Flashing could be more accurate, and series of flashes could offer
> more accurate and more useful information.
>
> Dave
I would have to agree that a varying LED output would be hard to
really make any visual reference that would be useful (unless you need
to know an on-off situation). I would like to suggest a possibility.
I've been working on an altimeter project with a variometer, which
measures the rate of altitude change. One project is an audio only
vario that uses sound to signify the rate. The pressure signal is
differentiated and amplified with an op-amp, then the signal is sent
to pin 5 of a 555 timer which controls the pitch. The same idea here
could be used by setting up the timer to focus on pulses instead of
pitch so that you get a blinking light rather than different light
intensities. This should work well for you, but then I don't know
exactly what it's for. I noticed by your part number that you're also
using a differential sensor rather than an absolute, so my guess is
you're reading the difference between two areas. I could be wrong,
but it's a guess. Anyway, let me know if the timer idea would help.
David
> brightness, but that is often relative to the ambient lighting.
> Flashing could be more accurate, and series of flashes could offer
> more accurate and more useful information.
>
> Dave
I would have to agree that a varying LED output would be hard to
really make any visual reference that would be useful (unless you need
to know an on-off situation). I would like to suggest a possibility.
I've been working on an altimeter project with a variometer, which
measures the rate of altitude change. One project is an audio only
vario that uses sound to signify the rate. The pressure signal is
differentiated and amplified with an op-amp, then the signal is sent
to pin 5 of a 555 timer which controls the pitch. The same idea here
could be used by setting up the timer to focus on pulses instead of
pitch so that you get a blinking light rather than different light
intensities. This should work well for you, but then I don't know
exactly what it's for. I noticed by your part number that you're also
using a differential sensor rather than an absolute, so my guess is
you're reading the difference between two areas. I could be wrong,
but it's a guess. Anyway, let me know if the timer idea would help.
David
Comments
and thanks for the help. The variable intensity LED is a must for my project, I
need it for a particular aesthetic/visual affect.
David Kissick <geckoinc99@y...> wrote:
> Interesting comment. Visual representation of pressure could be
> brightness, but that is often relative to the ambient lighting.
> Flashing could be more accurate, and series of flashes could offer
> more accurate and more useful information.
>
> Dave
I would have to agree that a varying LED output would be hard to
really make any visual reference that would be useful (unless you need
to know an on-off situation). I would like to suggest a possibility.
I've been working on an altimeter project with a variometer, which
measures the rate of altitude change. One project is an audio only
vario that uses sound to signify the rate. The pressure signal is
differentiated and amplified with an op-amp, then the signal is sent
to pin 5 of a 555 timer which controls the pitch. The same idea here
could be used by setting up the timer to focus on pulses instead of
pitch so that you get a blinking light rather than different light
intensities. This should work well for you, but then I don't know
exactly what it's for. I noticed by your part number that you're also
using a differential sensor rather than an absolute, so my guess is
you're reading the difference between two areas. I could be wrong,
but it's a guess. Anyway, let me know if the timer idea would help.
David
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[noparse][[/noparse]Non-text portions of this message have been removed]
0 flashes 0 pressure
10 flashes 10 or 100 psi
Larry Gaminde
Original Message
From: "gooey" <cantyant@y...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, March 07, 2004 10:25 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: PressureSensor-another possibility
hello all,
and thanks for the help. The variable intensity LED is a must for my
project, I need it for a particular aesthetic/visual affect.
David Kissick <geckoinc99@y...> wrote:
> Interesting comment. Visual representation of pressure could be
> brightness, but that is often relative to the ambient lighting.
> Flashing could be more accurate, and series of flashes could offer
> more accurate and more useful information.
>
> Dave
I would have to agree that a varying LED output would be hard to
really make any visual reference that would be useful (unless you need
to know an on-off situation). I would like to suggest a possibility.
I've been working on an altimeter project with a variometer, which
measures the rate of altitude change. One project is an audio only
vario that uses sound to signify the rate. The pressure signal is
differentiated and amplified with an op-amp, then the signal is sent
to pin 5 of a 555 timer which controls the pitch. The same idea here
could be used by setting up the timer to focus on pulses instead of
pitch so that you get a blinking light rather than different light
intensities. This should work well for you, but then I don't know
exactly what it's for. I noticed by your part number that you're also
using a differential sensor rather than an absolute, so my guess is
you're reading the difference between two areas. I could be wrong,
but it's a guess. Anyway, let me know if the timer idea would help.
David
To UNSUBSCRIBE, just send mail to:
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from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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Yahoo! Search - Find what you’re looking for faster.
[noparse][[/noparse]Non-text portions of this message have been removed]
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