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how do I magnify a voltages in a certain range from a sensor?

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ghsrocketman

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okay, so the title probably didn't make sense. I wasn't sure how to explain it in such few words. anyways, here's my problem:

-I have a barometer sensor that gives off a voltage range of 0.2v-4.8v, a direct correlation to pressure (15kpa-115kpa), to an ADC (0-5v)
-Most of the data from the barometer is useless... so that I don't waste any of the ADC bits (and to get more accuracy), I'd like to chop off the voltages from 0.2-2.5v, leaving 2.5v-4.8v, and spreading that over a 0-5v spectrum...

Is this even possible?

Thanks!
 
hi,
I provided a a fellow rocketeer with this circuit, he had the same requirement to measure altitude/pressure.

He has built the circuit and it works OK.

It uses a AD623 opa, the Vref could be simplified if required.

Lets know if this what you have in mind.

EDIT: are you using the MPX4115A or MPX6115 sensor?

Eric
 
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Eric,

Thanks for the quick response. I'm using the MPX4115.

That circuit looks pretty complicated.. Is it difficult to explain?

Thanks
Matt
 
ghsrocketman said:
Eric,

Thanks for the quick response. I'm using the MPX4115.

That circuit looks pretty complicated.. Is it difficult to explain?

Thanks
Matt
hi Matt,
I have attached the zipped text of some emails from/to the other rocketman.
They should answer some of your questions.

If you would like to contact the other guy, send me your email address in an email to me, I will forward it on.

Eric
 
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