speed from acceleration data

[espruino-discuss2]

Posted at 2022-06-13 by Harkaniemi

Hi,

I'm wondering is it possible to get hand speed ( or watch) when I throw baseball or frisbee disk?
You can do it by integrating acceleration ( like in here https://physics.stackexchange.com/questions/153159/calculate-speed-from-accelerometer) but for example, how to I get the loop duration time?
I would like to something like this https://apps.apple.com/us/app/arm-speed-analyzer-for-watch/id1539318987 but is it even possible?

[espruino-discuss2]

Posted at 2022-06-14 by Poolitzer

Yes, from my understanding it will be very much possible. You get an event every time the acceleration sensor reads data (if I understand correctly you can change that timing with setPollInterval), and thus you can "just" check the data with the last reading, if its a big enough acceleration, store the read data (+first time stamp if you want to avoid math) until the acceleration slows down, then do the sum math and display the result.