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Joined: Mon Mar 20, 2017 1:26 pm

Sense HAT pressure readings

Mon Mar 20, 2017 1:52 pm

Hello everyone

Don't know how to fix this issue, but it seems I'm getting incorrect readings for atmosferic pressure from my Sense HAT. At first, values seemed too low but that was just absolute pressure. When I used the equation for sea-level pressure, values always come up 6-7 hPa higher in comparison to weather stations nearby (provided by Weather Underground).

For example, my altitude is approx. 115m above sl and current absolute pressure readings are 1002.3 hPa (approx. 1016.5 hPa sea-level). Weather stations in my surroundings report 1010 hPa.

Am i missing something?

Just to be clear, my Sense HAT is connected with GPIO extension cable and put in separate case. The position is not ideal (approx. 3.5m above ground) but it shouldn't have that much impact on pressure. With extension cable temperature and humidity readings are just fine, only pressure is the issue.

Thank you in advance for your help

Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 1677
Joined: Thu Jul 11, 2013 2:37 pm

Re: Sense HAT pressure readings

Fri Mar 31, 2017 3:59 pm

From your post, a difference in altitude of 115m AMSL and 0m AMSL results in a ~10hPa variation.

https://www.sensorsone.com/altitude-pre ... onversion/

Are you sure your surrounding weather stations are at a similar altitude?
Rockets are loud.

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