Distance calculation ?

RE: Distance calculation ?

RixtronixLAB — Tue, 12 Jan 2021 10:30:37 GMT

ok, thanks for the idea 🙂

RE: Distance calculation ?

Jared — Tue, 12 Jan 2021 10:22:57 GMT

Hi,

I can't write the code for you. Did you check timer tutorial I linked? It should be fairly straightforward to type it in if you get a grasp on how the app timer library works.

Something like:

Start the timer and retrieve the start speed V0 from sensor
Stop the timer and retrieve the end speed V and the time elapsed.
Calculate (V0+V)/2 and multiply it with t

regards

Jared

RE: Distance calculation ?

RixtronixLAB — Sun, 10 Jan 2021 23:36:35 GMT

I want to get the distance but the speed is changing within time, please have a look on my xls spreadsheet attachment, devzone.nordicsemi.com/.../Total-distance-in-5-seconds.xls

How can I implement it in C with timer and array of Vo and V ?

Thanks

RE: Distance calculation ?

Jared — Fri, 08 Jan 2021 09:13:07 GMT

Hi,

I assume that you're asking how to retrieve the elapsed time.

You can use the app timer library and the function app_timer_cnt_get() to get the elapsed time. The function will return the number of elapsed ticks, so you'll have to convert this to ms, see this thread

App timer tutorial

regards

Jared