Exact. In the very long past, with carburator motors, there are always problems to start at 2000m as the auto was correct set for sea level. Low air intake.
I do not think people fully appreciate that devices using MEMS technology react nearly instanteously to ambient changes. Back when automobiles had voltmeters and ampmeters, the legends were whole numbers with wide intervals: +50A ... +10A ... 0 ... -10A ... -50A with similar legends on the voltmeter. This being noted, a pilot friend wanted a recent instrumentation to show to 2 decimal places! I talked him down to 1 after the fluttering in the display made reading impossible. Even with 1 Decimal place, I did significant averaging to eliminate the variations in the Decimal reading. None of this has anything to do with MEMS but...
Atmospheric pressure is constantly changing by the second. Surface winds, loud sounds, micro-bursts downdrafts, even a person sneezing near the MEMS sensor. Mechanical barometers have mass and the inertia of changes are dampened beyond the eye's notice.
My first digital barometric pressure sensor showed numerous irregularities on the display because I took instanteous readings over time... a foolish mistake. One must take numerous readings between the display scan and those readings must be averaged behind the scenes; the specifics are application based.
A pressure sensor in a gasoline engine needs instanteous results to control the fuel-mixture. A barometer reading needs averaged readings.
Smoothed barometric pressure reading over 48 hours:
Thank you for your comment, I will modify my code to do some averaging, perhaps a stack of N results overwriting the oldest. I'll give it a try.
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