News for hackers. Stuff that matters.

A comment on Bluetooth Trackball Mark II.

Re:Bluetooth Trackball Mark II by Tepix on Wednesday February 03, 2021 @06:12AM (#26012610)
Super cool. Could it use a 3d compass to determine the "forward" direction?
[ Parent | on HN ]
Re:Bluetooth Trackball Mark II by roland35 on Wednesday February 03, 2021 @07:29AM (#26013024)
You can see your local magnetic field using NOAA's handy online tool: https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml?u...

I didn't realize this earlier but my local magnetic field is actually mostly vertical! North: 19,625.7 nT West: -2,932.5 nT Vertical: 48,731.3 nT

[ Parent | on HN ]
Re:Bluetooth Trackball Mark II by jfedor2 on Wednesday February 03, 2021 @11:06AM (#26014938)
It does use a 3D compass (magnetometer), but it still needs to be told which direction is "up" as that depends on your orientation with regard to the screen.
[ Parent | on HN ]