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PTB PRO support meeting #3 (02/06/24) (Patreon)

Published:
2024-06-03 15:28:25
Imported:
2026-06
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Comments

Ivan

Very interesting!!! …

Ivan

But did I understand correctly? A version of BF with DN on DTerm ?? Can we try it? 😬

The PIDtoolbox Guy
>>139810676

you can but it's experimental. You have to compile it yourself. It is on Jan Post's Github fork of BF, a branch called dynNotchDterm I think. https://github.com/KarateBrot/betaflight/tree/dynNotchDterm

T69

Very good session on filtering! Thank you, Brian!

Fullwatts FPV

Thanks for posting this! Love the deep dives and detailed information. I'm fascinated by how well you know the tool and the subject matter. I've been flying and tuning rigs for 10 years and when I watch you I always learn something new. Please keep them coming.

Anthony Cowley

Super interesting, thank you to everyone who participated! I'd really like to see more log file investigations, as figuring out what to focus on in PTB can often be a challenge. The MATLAB excursion was appreciated, too! Very nice to pull back the curtain to dispel any sense of magic.

SuicideQuad_FPV

Key Takeaway The meeting focused on understanding filter delay in time versus phase delay in degrees and included a detailed log file analysis. Summary The meeting was titled "PTB PRO support meeting #3 (02/06/24)" and was held by The PIDtoolbox Guy on Patreon. The main focus was on filter delay in time versus phase delay in degrees. Detailed analysis of log files was performed during the session. The PIDtoolbox Guy invited participants to join future meetings. A user named Ivan expressed interest in a version of BF (likely Betaflight) with DN on DTerm and received information on how to compile this experimental feature. Another user, Axel Kunze, appreciated the session on filtering. Fullwatts FPV acknowledged the depth of information and expertise shared in the session and expressed ongoing interest. Anthony Cowley found the session enlightening, particularly appreciating the MATLAB demonstration and the breakdown of complex topics.

SuicideQuad_FPV

you guys discussing gyro filters i take away a few things: 1. traditionally the approach was to filter stronger on gyro because d-term is calculated on the filtered signal 2. however delay on gyro filtering is much more impacting flight performance then similar delay lengths on d-term 3. the gyro slider isn't linear at all, more like exponential adding more delay from top to bottom 4. tuning of gyro filters beyond 500hz only will create like 1ms in gains 5. 500hz LPF1 is recommended to be used on 5inch rigs

SuicideQuad_FPV
>>140361811

theres multiple questions that come up for me: re 3. is this also true for the d-term slider? and most relevant: on all my builds, i am so far am able to get away without any gyro low pass filtering and just using dynamic notch, rpm filtering and one pt3 d-term filter. is this to be preferred on a clean build or am i causing downstream issues like more delay by the other filters by not adding the lowpass first? i assumed so far less is better but now i start to see the picture of the interrelations of all those filters.

vrjo

Very good session, nice that you talked through some example logfiles.