BF 4.5 RPM Data Analysis | Dynamic Notch vs. RPM Filter

00:00 - Start
00:47 - RPM vs. Dynamic Notch Speed
09:02 - ESC Telemetry vs. BiDirection DSHOT
12:06 - RPM vs. Dynamic Notch for MOTOR Vibs
13:03 - Magnetic Fields vs Motor Rotation Rate Change
15:17 - INAV vs. Betaflight RPM filter Difference
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[@PIDtoolbox]

Great info Mark, thanks! It’s taken me several years to really appreciate how significant a contribution RPM filters were/are, thanks to Thorsten.

[@Tonynux]

Really. Thank you Joe Lucid!

[@cold-frontin_penguin7902]

The drone blackbox God himself still at it providing all this knowledge.❤

[@IvanEfimovLimon]

Great summary, Sir.
And yeah, bidirectional dshot RPM data comes right after every motor command, so pretty much every PID loop.
Then it's being filtered a little, i think with 150hz pt1, which gives ~1ms latency at frequencies close to zero.

[@davidsmay698]

Very cool to have all this additional data getting logged by default. Thanks for explaining how to make sense of it!

[@6996Tim6996]

Thanks for putting out these videos, glad to have you working with the BF team on this. Will you update your preset for 4.5? Really like the micro preset.

[@uavtech]

they are in there now

[@airdronelongford2027]

Thanks Mark

[@phiveone]

Always wondered what the fidelity of the esc data was over the wire actually was. Boom!

[@sketchpv3080]

If I flash from 4.4 to 4.5 what parameters should I avoid carrying over?

[@mgbfpv]

Hi Mark. I have a doubt that's related with notch filters but is most a build question. My quad war flying well, i tuned it and it was pretty straightforward including filters, just addresed the single noise column of the frame ressonance at 218hz with a notch filter, configured rpm filters, etc. Now I've rotated the stack 180° to get xt60 in the front and replaced the rx with a dual-antenna one that are on both rear arms. Now I got two very clear noise columns on the throttle x frecuency chart at 167hz and 230hz. The lower freq. noise is slighly visible in roll axis, but very strong like the higher freq one in pitch axis. Could it be because of the rx antennas (2.4ghz)?, previously I had just one on rear righr arm. Battery lead is alse secured with zip ties and connector tighted in the battery straps. Thanks!

[@Quick-Flash]

Actually it's possible to get ESC telemetry much faster than your seeing. It's technically possible to get 8k ESC telemetry. Yes it does have more overhead than bidirectional dshot, but it's possible bf just isn't setup for that.

[@xORLOCKx]

Does 4.5 help with the ICM42688 gyro now?

[@timmytson1]

So if I use rpm do I not use dynamic notch ?. Is it a one or the other kind of thing ?

[@uavtech]

it can be for a clean build.
but typically, the DN stays on with RPM for frame resonances, etc...

[@timmytson1]

@@uavtech thank you

[@ondrascz1]

INAV is pathetic on so many levels. One would say that is would be superior in tasks like RTH, land and disarm. The recent tests of INAV 7.x show that after many years the colision / land detection in INAV is still inferior and that it hapilly fry your motors being upside down at the ground. The BF's rescue mode does much better job here.

[@Sugar_K]

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