This is just a quick question. Does anyone have any experience with tilt
sensors. The ones that I am thinking of will produce a + and - signal for
both an X and a Y tilt. The cost of the one that I have checked on so far is
about $150 US.
Any experiences either good or bad?
|At 12:42 AM 7/31/97 -0500, you wrote:
>This is just a quick question. Does anyone have any experience with tilt
>sensors. The ones that I am thinking of will produce a + and - signal for
>both an X and a Y tilt. The cost of the one that I have checked on so far is
>about $150 US.
>Any experiences either good or bad?
from an earlier exchange of messages ...
"Some years ago I used tiltsensors in a project to monitor feeding behaviour
of herbivores (deer). The sensor was mounted in a collar-based transmitter,
sending a code for the animal in combination with a tiltcode.
The system was used succesfully in the central part of the Netherlands for
quite a while.
The sensor was of the type SP5000 by SPECTRON Glass & Electronics.
It's a "vertical sensing electrolytic potentiometer" with 5 internal
electrodes. It measures about 25x13millimeter.
Get in touch with Spectron, 595 Old Willets Path, Hauppauge, N.Y.11788
tel. (516)5825600 fax.(516)5825671
Willem van der Veer
Institute for Forestry and Nature Research
P.box 23, 6700-AA Wageningen, The Netherlands.
e-mail : ibn.dlo.nlw.vanderveer
The owner is a customer of mine. Send him mail and ask about buying his
sensor. The sensor module itself goes for $25-$30 AFAIK.
At 12:42 AM 7/31/97 -0500, you wrote:
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
Hardware & Software for Industry & R/C Hobbies
"Go fast, turn right, and keep the wet side down!"
> From: Troy Powledge <ERAMP.NET> tpow
> This is just a quick question. Does anyone have any experience with tilt
> sensors. The ones that I am thinking of will produce a + and - signal for
> both an X and a Y tilt. The cost of the one that I have checked on so far
> about $150 US.
> Any experiences either good or bad?
No experience but Philips do a magnetoresistive sensor which they claim is
superior in several respects to the normal hall effect designs. No doubt
your friendly Philips' Sales Office would be happy to help. :-)
Mark G. Forbes
|You should contact the Fredericks Company, or
Spectron Glass and Electronics. Both of these
make electolytic vial-based tilt sensors, with
resolutions that can be below a tenth of a
percent of slope.
These devices consist of a curved glass tube,
with an electrode at each end, and a center
electrode. A bubble in the electrolyte moves
back and forth based on slope (the traditional
bubble level, electrified) and the center
electrode is used to measure the bubble position.
There are some constraints; these devices will
fail if exposed to DC currents (that means even
an ohmmeter!) so they must be completely capacitor-
coupled. The usual method is to drive the ends
from a differential output amplifier, then use
a precision bridge to rectify the center electrode
signal, amplify the resulting DC and meaure
the amplitude to derive slope. Note that a
conventional diode bridge won't work; too much
deadband in the middle.
Non-linearities can occur because of the drive
electronics, or because the glass vial isn't *exactly*
a uniform curve. In the application I used these on,
we bought vials to a specified degree of precision.
We could get others for less money, but they weren't
as precise. Nowadays, I'd buy the cheap ones and
linearize them with a table in ROM....but back then,
that was still a bit exotic.
Precision slope measurement is a surprisingly tricky
problem, and the choice of sensing technology is
really dependent on what precision you need and
what the intended environment is.
Mark G. Forbes, R & D Engineer | Acres Gaming, Inc. (541) 766-2515
KC7LZD | 815 NW 9th Street (541) 753-7524 fax
peak.org | Corvallis, OR 97330 forbesm
"There has been an alarming increase in the number of things I know nothing
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