Subject:
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Re: Sensor questions
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 13 Jan 2000 04:04:50 GMT
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Original-From:
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John Horvath <jhorvath@ma.ultranet.comSTOPSPAM>
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Viewed:
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998 times
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On Wed, 12 Jan 2000 10:16:26 -0500, you wrote:
> I have several sensor questions.
>
> ...
>
> I would also like the board to sense air pressure and humidity. I have read
> about capacitors that will vary with humidity,
> but I have no idea how to make them work with the Miniboard. Can anyone
> provide any tips on this.
The Electronic Surplus Dealer Goldmine, http://www.goldmine-elec.com/,
has been selling some weather balloon electronics innards for a few
years. On this board there are some relevant sensors: a thermistor,
some sort of barometric chip and a humidity "device".
The humidity "device" is a plate of glass which appears to be covered
in what looks like carbon dust. There are clip-on leads on each end of
the glass. As the humidity changes, the resistance of this plate
changes. Its quite sensitive, changing rapidly by just breathing on it
from a distance.
With these sensors, you can figure out the temperature and humidity
experimentally. I haven't been able to find any source on the web that
lists the pin outs for the barometric chip though.
Cheers,
John Horvath
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Message is in Reply To:
 | | Sensor questions
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| I have several sensor questions. I would like to use my miniboard as an engine management system. At the present time, I have a small 2 cycle engine from a weed wacker that I would like to control. I would like to have the miniboard gather some (...) (25 years ago, 12-Jan-00, to lugnet.robotics.handyboard)
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