Acceleration Log

Posted on Wed 30th, June 2021

• #1

LeebWeeb

There is an app on this watch that allows us to record acceleration over time. The time is in milliseconds. What is the unit for the acceleration?
• #2

Gordon

This app? https://banglejs.com/apps/#accellog

In the data, 1g = 8192 (which is the accuracy of the actual accelerometer chip)

Actually it probably makes sense for me to modify the downloader app to rescale everything into g?
• #3

rigrig

If it's going to rescale anyway, maybe use m/s²?
• #4

LeebWeeb

What is g?
• #5

rigrig in reply to @LeebWeeb

g is the constant for standard acceleration due to gravity: 9.8 m/s².
This pops up a lot in accelerometers, because a sensor at rest measures 1g in the vertical direction.
• #6

HughB

@Gordon at the moment I think accelog only records the X,Y,X values but not the magnitude SQRT(X*X + Y*Y + Z*Z). Having the g value is useful, but also agree m/s/s would be useful as well.
• #7

Gordon

We could definitely make the 'interface' file report the magnitude values as well. I guess maybe some kind of drop-down for selecting units?
• #8

LeebWeeb

So, the unit is in g?
• #9

Gordon

Right now the value is 1 / 8192 g

So if you get a value of 8192, that means 1g, or 9.8 m/s2
• #10

LeebWeeb

ohhhh. Thanks!
• #11

LeebWeeb

Im working on a new function. I'll let you all know when it is done!

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