Altimeter readings very low on bangle.js 2

Posted on Thu 11th, November 2021

• #1

blogmywiki

My bangle.js 2 is giving very low readings, around -73m when I'm at ground level in South London. The number changes to a smaller negative number as I go upstairs, suggesting that something is working, but does it need calibrating in some way?
• #2

Gordon

Hi,

Yes, right now there's no calibration built in (I guess you made the app from the Getting Started card?) but the altimeter uses the air pressure, and air pressure changes depending on the weather - so it does need some calibration of the starting height.

It should be reasonably easy to add a calibration value to that app though.
• #3

blogmywiki

Hi Gordon - yes that's right I made the app on the card and fiddled with it! Good to know, thanks for the swift response, very much appreciated.
• #4

HughB

Could it be calibrated from a gps fix?
• #5

Gordon

Yes, it could. However because of the orientation of GPS satellites the precision of altitude is a lot lower, so GPS isn't super exact either.

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