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help needed precise altitude measuring at high altitudes
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Please be positive and constructive with your questions and comments.

help needed precise altitude measuring at high altitudes

by DrorAllen on Tue Aug 11, 2020 3:51 am

Hi everyone,
This is my first post and I am not a developer or a specialist, I have an aviation project and I need a good reliable pressure and altitude reading with accuracy of at least 100 feet (Means that I don't care for a 100 feet reading error).

I need those readings to be reliable at up to an altitude of 40,000 feet, where absolute atmospheric pressure is 187 mBar (2.71 PSI).
As far as I can tell, this exceeds the lower pressure limit for every altimeter sensor for Arduino I could find.

If you have some good ideas about how to solve this problem, I'd be very grateful.
Thanks!

DrorAllen
 
Posts: 2
Joined: Tue Aug 11, 2020 3:25 am

Re: help needed precise altitude measuring at high altitudes

by mikeysklar on Tue Aug 11, 2020 11:42 am

I see the challenge in finding a good sensor.

Our BMP085 / BMP280 / BMP388 all measuring up to 30,000' with a pressure range of 300 - 1100 hPa.

The LPS25 can do a little more with a 260-1260 hPA range. The LPS35 has the same range, but is waterproof. Both are 24bit output. Still only gets you to a little over 33,000'.

The best option I see is the MPL3115A2. It can do up to 38,640'.

https://www.adafruit.com/product/1893

Would it make sense to use an ultimate GPS as well? It seems like you might be able to get a second confirmation on altitude near 40,000' since our sensors tend to max out just before that.

https://www.adafruit.com/product/746

mikeysklar
 
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Joined: Mon Aug 01, 2016 8:10 pm

Re: help needed precise altitude measuring at high altitudes

by DrorAllen on Tue Aug 11, 2020 1:02 pm

Thank you, very very much.
I guess that I can do with 38,000ft as well, the remaining 2000ft isn't that critical. I already have a GPS altitude on a different system.
Thank! ;)

DrorAllen
 
Posts: 2
Joined: Tue Aug 11, 2020 3:25 am

Please be positive and constructive with your questions and comments.