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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Wed, 12 Jan 2000 15:50:02 GMT
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Original-From:
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Sathe Dilip <SATHE_DILIP@BAH.nospamCOM>
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Reply-To:
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sathe*_dilip*@bah.%NoSpam%com
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Viewed:
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622 times
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Jonathan Swaby wrote:
>
> I have several sensor questions.
SNIP
>
> 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.
Newark electronics used to sell a humidity sensor based on this
principle for about $ 12. It should still be available. I believe it
was made by Phillips. Basically the variations in capacitor value is
used to vary the frequency of an oscillator & then the frequency is
changed to voltage to get the indication of humidity. There may be some
linearization issues involved depending on the sensor's characteristics.
I have used one of National's charge pump type freq-to-voltage converter
chip (I think it was LM 2917). This device is easy to use & quite
linear for most purposes.
Dilip
> SNIP
--
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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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