simple sensitive air flow monitor using temperature sensing

naz83 · Jul 1, 2010

Hi, can any1 plz suggest a simple circuit to make a sensitive air flow monitor using temperature sensor. i understand that this needs a bridge and an amplifier. the output from this is uded for ADC then use an AVR as microcontroller and drive a display.

right now i am concerned with the anolog part of it. plz do post he circuit diagrams if u have

Thanks

kender · Jul 3, 2010

Re: simple sensitive air flow monitor using temperature sens

Here's a good discussion on thermal air flow sensors:

Here's a couple of designs that use self-heating transistors. Typically transistors with "metal can" case are used because they have better heat transfer.
http://www.edn.com/archives/1996/031496/06di3.htm
http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=3990

BTW, here's a group dedicated to sensors: **broken link removed**

naz83 · Jul 26, 2010

update on air flow meter

I did experiment with pt1000 today.

I did use two bridges each having one pt1000 as a sensor and one of the resistors was 1.2k. as a result the pt1000 was heated to reach 1.2k.

Its like having two anemometers, one of them was subjected to air flow and the other was like a reference. and the outputs from these two was given to a differential amplifier to amplify the difference between the two. I did get it working, when no air flows the diff output is 0.13v and on air flow depending on the amount of airflow it increased to 3.0v.

could u suggest what needs to be done further to get it to a uc and the AVR part plz....

simple sensitive air flow monitor using temperature sensing

naz83

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kender

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naz83

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simple sensitive air flow monitor using temperature sensing

naz83

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