Subject:
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Cheap air flow sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Jun 1998 18:11:21 GMT
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Original-From:
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Jonathan Swaby <{jfs10@psu.}IHateSpam{edu}>
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Viewed:
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1184 times
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Does anyone know of a cheap way to construct an air flow sensor? I was
looking for an article in EDN on using a self-heated transistor to measure
airflow, but Ican't find it.
I was also wanting to know if there is a way to create a humidity sensor,
or does anyone know of a low cost part?
I am wanting to connect these to a miniboard.
Thanks
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Jonathan Swaby 305 Sparks Bldg
Computer Support Specialist 814-865-0693
Penn State University mailto:jfs10@psu.edu
Department of Speech Communication http://cac.psu.edu/~jfs10
Department of Philosophy
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Message has 2 Replies:
 | | Re: Cheap air flow sensor
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| We have used model boat propellers on a ballbearing and on a brass bushing. Keep the bearing or bushing well lubricated for good sensitivity at low air volume (ie: low speed of the propeller). We used the propeller mounted in 1.5 inch and 2 inch PVC (...) (26 years ago, 15-Jun-98, to lugnet.robotics.handyboard)
| | | Re: Cheap air flow sensor
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| Elektor had published a similar circuit for detecting air leaks. The heated transistor and another transistor acting as temp. sensor were glued together using heatsink compound. You had then to nullify/calibrate a meter at ambient temp. when the (...) (26 years ago, 16-Jun-98, to lugnet.robotics.handyboard)
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