On 30/06/2020 21:27, R.Wieser wrote:
> Adrian,
>
>> My local airfield is giving 1004hPa (at 29m altitude), my BME280 is giving
>> 994, so using the 1hPa/27ft quoted by Tauno Voipio, that suggests a 270ft
>> (~93m) difference in altitude, whilst the map suggests 71m.  Which doesn't
>> sound right, but the trend is right.
>
> I did some more googeling, and found an Arduino project* for the BMP180
> which incuded a formule for altitude correction (and vise-verse).   The
> result was that I'm now only 4...5 full points away from what it should be.
>
> *https://www.circuitbasics.com/set-bmp180-barometric-pressure-sensor-arduino/
>
> Going the other way around it results me being at about 50 meters over sea
> level, instead of about 20 - and that doesn't seem right (I don't think my
> ceiling is 7 meters up. :-) ).
>
> Regards,
> Rudy Wieser
>
>
Modern houses are roughly 2.5 meters per storey.

What is the tolerance on the sensor anyway?



--
"The great thing about Glasgow is that if there's a nuclear attack it'll
look exactly the same afterwards."

Billy Connolly

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