[DIS] Building a temperature sensor

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#1
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Would anyone be interested in a lab I'm writing involving how to make a thermometer? It's not really related to AVRs at all but it could possibly be useful to someone.

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I'm interested.

Don

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donblake wrote:
I'm interested.

Don


I do not know how useful it would be but I'll post the lab report after I finish it which will be before Thursday. This was one of the more annoying labs because we built the thing on a breadboard. Of course in order to test the thermometer we had to compare it to a known temperatures. Dipping part of a breadboard into boiling hot water was fun. It was neat though because I never really thought you could turn a bunch of BJT's into a temperature sensor.

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Thermometers and temperature measuring is a recurrent question asked in this forums, thus I think it would be welcome and interesting to do. Probably many people would learn about it.

Guillem.

Guillem.
"Common sense is the least common of the senses" Anonymous.

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I guess the issue here is...

This tutorial section is meant for tutorials already completed.

I don't think this is the place to be asking whether a tutorial is wanted, which, of course, would be wanted it it was accurate and good quality.

You can avoid reality, for a while.  But you can't avoid the consequences of reality! - C.W. Livingston

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Adam wrote:

Quote:
I never really thought you could turn a bunch of BJT's into a temperature sensor.
Silicon diodes do quite well too.

Indeed this is not the place for such a question. Dean will move it soon to the General Electronics I guess ..... if he finds the time ;)

Nard

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There are a number of temperature sense ICs that use external base-emitter junctions as the actual sensor. You tie the base and collector together and it is a more ideal diode that a diode is. This also lets you locate the actual sensor away from the electronics plus the sensor often has lower thermal mass than an IC.

Jim

 

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