Betaflight 4.5 Filter Tuning

Get my ENTIRE Betaflight 4.5 Tuning Guide covering Filters, PIDs, and Rates as a PDF here: www.patreon.com/collection/43...
Timestamps:
0:00 Intro
0:50 Blackbox Settings
2:30 Viewing Blackbox Logs
4:09 Filter Sections
4:47 Get the whole guide as a PDF
5:16 Expert Mode ENGAGED!
5:32 Gyro Filters
7:26 RPM Filtering
8:43 RPM Crossfading
10:25 RPM Filter Q Factor
11:41 Biblade vs Triblade
12:35 RPM Filter Dimming
14:07 Dynamic Notch Filter Count
16:19 Dynamic Notch Frequency
14:07 Dynamic Notch Q Factor
18:37 D Term Low pass filters
19:11 Default vs AOS D Term Tune
22:49 Karate D Term Tuning
23:20 AOS D Term Tuning
24:11 Dynamic Curve Expo
25:25 Yaw Lowpass Filter
26:33 Next Steps

[@TriMeX1987]

Just a suggestion what I kind of miss is what to do for a test flight... to get the gyro data. And maybe do this in the future with one of your friends/ patreons to start of with a less of a good build/quad. and take it step by step how to tune it to fly really good. For example for myself I run into this problem trying to tune a 2.5 inch qav frame wich is a whoop and needs to run in pretty warm weather.. can't use the hot motors. I do as allways enjoy the content and the way you explain it.

[@michaelo9071]

I agree. Can someone explain how to do the test flight? Im not sure what to do to get the correct black box log

[@TWEECH45]

This is a great video! I’ve watched so much about filters but nobody dives as deep into what the numbers actually mean and how to adjust them.

[@inCarsoNatedFPV]

I’ve been consistently watching your videos the last couple of years. You’re not only very knowledgeable, you’re a great teacher as well. Anyway, this is the video that put me over the edge- guilt has overwhelmed me considering I’ve been receiving all this knowledge goodness for free and I haven’t given you anything in return. Today is the day I buy a year membership on your Pattern😎 Thank you again for all you do.

[@jacekkaczmarczyk_drones]

Great video Chris, amazing work!!!!

[@yamasaur]

Exactly the video I was looking for when trying to figure more out about tuning! Thanks for this great video!

[@jumpstartfpv]

Superb timing. I was starting to wonder when you'll update this.

[@Nemesishk]

Appreciate these videos a lot, learned much from you. keep it up Chris

[@MrPepyaker]

Great video, with a very detailed explanation. Thank you a lot, Chris!

[@kmarlow1]

Very detailed explanation! Much appreciated!

[@jimmyarroyo356]

An updated tuning guide... I'm gonna join your patreon right now.

[@RobertTheFriscoSchmid]

This is the best FILTER TUNE video I have seen, and I watched a few walking away puzzled, even your older ones :-) ... THANKS

[@VasylDemianov]

Just as I am about to start tuning my new quad, this video comes out! Perfect!)

[@johncgibson4720]

Just watched your episode about BMI and MPU gyro filters. Excellent work and presentation and tech prowess.

[@moonraker814]

Thank you as always Chris! I'm following this series closely to dial in my AOS 3.5 V5.

[@alexdefelice2448]

This is the video I was waiting for before "spring cleaning" and reflashing my quads.

[@tootfpv]

I’d pay for you to give lectures like this! Great video!

[@ronboFPV]

Just re flashed all my Quads to 4.5 now to start tunning, thanks for the in depth video and information. Very nice work.

[@sebcbien263]

Amazing video, so knowledgeable and informative. Thanks a lot!

[@fpvfanatic]

Great great video about filters. I've watched so many of them and this video here has finally made me understand what filter does what and how to properly use them. 🙇‍♂️ down to you Chris.

[@lixxfpv]

This Video comes in clutch, planned to tune my Quads today👌😊

[@cineflight1171]

I love your work, thanks a lot for your effort👍💪🔥

[@Mekanikern]

Thanx Chris, very good video! I miss one thing though, RC filtering.

[@batdronefpv]

THX for your great work 💥💥

[@dukedblu]

Thank you, explained very well

[@suicidequad]

chris your such a legend. can't believe this is free content. happy to be your patreon. learned alot of new things already on the first watch.

[@marinehm]

Awesome! You were either reading my mind or saw a comment about this in one of the other videos. This is just what I needed to learn black box and get the information I needed to tune my quads PROPERLY! At 2:50 you mention BB Explorer will be a link to the latest version in the description below. The link is not there.

[@Mad_Voyager]

Great job! thank you sir!

[@johncgibson4720]

I use betaflight 4.3 for my helicopter that the main rotor spins at the fixed 50 Hz. Your previous episode inspired me to do the v-shape filter on 50Hz and cut out everything past 50Hz. I do vertical dives with the heli and the terminal velocity is where the problem kicks in.

[@mrthingdudeman]

I think this is the first video that I have watched on BF filters, where everything is explained and reasons are properly explained. Im very much interested in tuning quads, but it always seems it's a black art. It appears that everyone comes from this subject with a different perspective and this video seems to explain it such a way where I can filter my quad knowing if I see an issue, I have the knowledge to make the proper adjustment.

[@inCarsoNatedFPV]

2 things. 1- fantastic story teller! Thank you so much for sharing the experience. 2- Ya gotta visit Chili and or Argentina; your kind of geography😎

[@theaman4005]

Nice video pal. So glad you confirmed the linear value of 5, for d term expo - I've noticed the "filter line" in black box explorer doesn't seem to change when you adjust the expo in betaflight.

[@cbro1111]

I appreciate this. 'Just built a 'fiddly' UL7. Its gonna'be a very good tune

[@jeffparisse4202]

This video was so good, I bought an AOS Hoodie! I’ll wear it in the Hawthorne Aerospace Corridor on a daily basis. SpaceX, Aerospace Corp, Lockheed Martin, Raytheon, Northrop Grumman and the LAAFB (home of GPS) are all within walking distance of my house.

[@mrthingdudeman]

SouthBay represent. That is a big corridor, my man.

[@jeffparisse4202]

@@mrthingdudeman Well I exaggerated a bit with SpaceX… it is 2.5 miles away at the Hawthorne Airport. 😇

[@Thomy_fpv]

Thank you 🫵🏼🙏🏼

[@demvlad2]

Thank You!

[@dabfpv]

Good timing :) I just installed bf4.5 on my AOS 7

[@daan-the-maan]

Thanks!

[@DriftaholiC]

Awesome, looks like a retune for 4.5

[@bawonohari7520]

Great, love that..

[@larstobler6047]

Danke!

[@user-yk1cw8im4h]

Amazing work! Learned so much! (Just pretending I understand this video like everyone else, to be frank how many people actually understand this stuff unless they have a phd in EE?)

[@ruirpm]

What😮?

[@ruirpm]

What😮?

[@sebastienboury]

Always awesome video ! I have a question about the impact of the TPA breakpoint when you tune the filters?

[@1337plans]

Yeah buddy!

[@MarcBergenthal007]

This is a great video! Many thanks. I have one question and I think it was not covered. How would loose parts make themselves visible on the chart? Would they appear as vertical lines linke the frame resonance or horizontal lines? I was also wondering if you could comment on the very faded horizontal lines that were hardly visible on your graph. Many thanks again! 😊

[@kenimhof9333]

Excellent information. Does this directly apply when using 3d bidirectional reversing motors.

[@sancanhep2957]

that great

[@Renaissancedubois]

Very interesting thank you 🙏 but something that I ask myself every time and which we don't hear much about is at what level of brightness / zoom the noise must absolutely be filtered because it would cause problems, white? because on some of my drones there remains light red everywhere after filtering but it flies well

[@ungravityfpv]

BLESSS

[@user-wz7ch1mq9h]

Great Video Chris ! Are you going to release 4.5 Betaflight presets by any chance 🙏?I’m currently in the middle of an Aos 5.5 Evo built ,I would love the benefits of 4.5 eventually but might stick On 4.4 due to your presets & filters . As this is my 1st 6s build what would you do if me ? 😎👍

[@carterdavis5176]

2:46 the Blackbox explorer is not linked in the description as stated in the video.

[@antonmashko]

Thank you for a great video! Is there any way to backup filter settings using CLI?

[@filipefrango1671]

Hey Chris, amazing video, thank you very much!!! got a quick Question, i have Speedbee F7 V3 witch has BMI270 at 3.20 kHz Gyro(due to BMI270) and 3.20 kHz PID loop, do i still need Gyro lowpass2 ON? thanks a lot

[@ProjectMockingbird]

Dude, really appreciate this video on filters and how 4.5 treats things. Gave me a great baseline to tackling Whoops and their unique noise profiles. Any benefit to using a PT3 filter on Gyro 2 for aliasing, or is PT1 still best?

[@johncgibson4720]

4:35 The static notch filter is crucial for single rotor helicopter with RPM governors for fixed Hz noises. I hope betaflight never removes it.

[@undeze]

Thanks for the video. I've read elsewhere that BiQuad filters should be avoided, specifically in BF4.3, due to them being very consuming of resources. It was suggested to use PT1 filters instead. What are you thoughts on BiQuad vs. PT1 filters in BF4.5? Thanks.

[@arpan.sarkar]

Can you please do tuning stuffs for inav also. There are lots of tutorials on beta flight tuning but very less resources for inav. 😢

[@christopherconkright1317]

23:59 what do oscillations sound like?

[@TaseenAli]

Anyone else having issues with BF 5 ? on some cases bf is deselecting settings that's already been setup ! happened to me 4-5 times now so far! like uarts would be deselected or rx protocol or presets! and its always random.

[@rwdturbo]

I'm new to tuning, and ill use tgis videi as a guide so thank you. But what type of flight should i do for a log? And do you need to turn off all the filters fir the first logs ti get the beat data?

[@AndreasFelix]

Would have loved to see how the Blackbox log flights were done.

[@Mojohoojo187]

anyone knows why at @5:33 the slide says increase Gyro filter multiplier to 2.0 (Less filtering when we suppose to be filtering)?

[@alshatti_fit]

hey chris > How do I know whether the vibrations are from the curve or , the min, or the max frequency ?

[@paparambo2557]

i just dont see harmonic motornoice of my motors on my 2 bladed quad. what gyro rpm filter should i use then?

[@guitaro]

When I start up blackbox explorer it looks quite different and I'm having a hard time getting it set up like his. Any tips anyone?

[@PistiBala]

Dear Chris! You are so clever, I think you can write a script that analyze the noises from blackbox and gives a recommendation for datas to write in the configurator. Do I think it right? 👍

[@MactacFPV]

Sometimes I find that I have wobble/vibration caused by the PID loop with non-standard builds. Without realizing this, I start setting the filters and end up being way too heavy on the filters, when it's really something weird in the PID loop. How do you set a "neutral" set of PIDs to tune the filters? Or is there an easy way to determine if an oscillation is due to the PID loop vs noise?

[@AndyDreadFPV]

With non-standard builds you're off the beaten path. If it's a bigger quad then I would lower the main PID slider just to get the thing flying stable if its a tiny quad then go in the opposite direction. in general If you have high power-to-weight ratio then lower the main PID slider if you have lower power-to-weight ratio then increase it.

[@mgbfpv]

Hi Chris. You don't talk about props (or I didn't get that part). What happens if I loose a blade after a crash and try to bring back the quad flying to my position? Are some pretty tight filters more prone to create issues with props damage than others? Can I push some filters to the limit without be worried of burn a motor if I fly with smashed props? As usual your videos are very helpful. Thanks.

[@ADfpv]

Tryd it on my cinelog 25 v2. Helpd with the flying but, now when throttle is at 0% quad rolls right and twich... any suggestions?

[@rimantasri4578]

Hey, thanks for the video! One question: what if I crashed into a tree or something, and some drone parts started negligibly "wobbling" and causing some noise? Or a prop breaks? Wouldn't I smoke my motors then with many of the default BF filtering settings turned off (according to your video)? Perhaps it is safer to leave some of them on just in case a sudden imbalance occurs?

[@benmintz3188]

Is there a good place to understand how to tune a 3" 3S toothpick?

[@divingfalconfpv4602]

Dont think i have any frame resonances. I dont remember seeing any vertical. I lowered min closer to min motor noise. 10" quad so seems to be like 75 to 80hz noise starts. But all look like motor noise not vertical. So i should just raise dynamic notch back up to save delay. Maybe remove a low pass filter for less delay.

[@rgglenn150]

how do you record blackbox? flying? or just idling?

[@Cloud1242]

I havent even watched yet, just excited for a Chris Rossed filter refresh.

[@christopherconkright1317]

Could you show how to do a test flight?

[@danielnoname8352]

Hi, regarding Blackbox Explorer 3.6 - is there the JSON file for "base config" the same as UAVTECH published for 3.5? I am trying to look for it but found nothing and JSON for 3.5 is not loading for 3.6.

[@n8zfpv]

Fyi. I had to enable gyro_scaled in bf4.5.0 no gyro data when leaving it set to no

[@InertiaFPV]

Great video! However don't you think it is best to tune the PIDs before tuning the filters? The reason being is that if your PIDs have a bad tune then you're going to get majorly bad motor/frame osolations anyway. I think it makes more sense to tune the PIDs using the PIDtoolbox then coming into BF and tuning the filters to finely tune the kwad?

[@marcogreco892]

Hey @ChrisRosser do you know why Axisflying suggest on FC with BMI270 Gyro to activate lowpass Filter 2 with a 135Hz frequency and PT2 Type? If I look at your guide this setup have no sense

[@KidCe.]

Could you say something about tuning a race quad? i feel like alot of this tight tuning would not apply there because racequad often get very "unclean" from extremely bent props and maybe even parts coming loose. Most pilots will just keep pushing through the round and hope their motors wont burn. I guess the trick here is to tune while having some bent props on?

[@cervellimatteo]

I don’t have the black box in my fc on squirt cinewhoop

[@dand.1941]

What kind of movement should I do to get the blackbox information needed? Should I just slowly increase throttle until it reaches 100% or big punches ? Sorry if it is obvious

[@serenestateofbeing1062]

How do you fly to get that filter graph? Is it like making the quad move around a bunch for 15 seconds?

[@sebastienboury]

Why do you use a Biquad and not a PT3 for the D term filter ? Thanks

[@randomdudefpv4927]

What to do if my blackbox logs are broken? aka my sdcard slot fell off :D

[@Moroder_Drone]

does that work for the betafpv pavo20? can't find the option in the betaflight blackbox Thabnks

[@belgarathlesorcier8385]

How do you recommend to adapt those settings for Tiny Whoops ?

[@plop386]

2:55 no link in decription :)

[@props_in_view]

I'm unable to turn on the analyser display in the overlay menu. I've imported a log file, but when I click on "View/Hide analyser", nothing happens. However, I can toggle on/off the craft display and stick display. Have you come across this issue or am I missing something?

[@tmsrc]

I was facing the same problem click the gear icon on the right of the black area to show the legend press graph setup add graph then select debug

[@props_in_view]

@@tmsrc That's great - thanks a lot!

[@tmsrc]

@@props_in_view your welcome it took me a week to figure it out 😂

[@lucaspohlmann7162]

Whenn Tuning the AOS-Preset, what doo you exactly mean with oscillations at zero throttle. Is it just looking at the Quad in armed state but with no Throttle

[@paulfrmn1]

In the air zero throttle

[@TabulaRasa001]

If you’re setting one of your rpm_filter_weights values for a tri-blade to zero wouldn’t it be better to reduce the number of harmonics from 3 to 2?

[@OneTakeFPV]

you will update your presets for 4.5 soon ?

[@christopherconkright1317]

The link for blackbox isn't listed

[@maryjane136]

Brilliant video, thank you. Why did not someone implement a function to read recorded raw gyro data from a UART to feed the PID loop and do a recording into the internal memory as usual? So I would be able to test filter settings on the bench.

[@emtbbam2895]

KarateBrot should do this.

[@cinemoriahFPV]

You can use cli commands to do that.

[@emtbbam2895]

@@cinemoriahFPV Oh, okay. Can you tell how? Or give an advice which commands to use?

[@maryjane136]

@@cinemoriahFPV I hope you understand this in the right way. You download the btfl_001.bbl and use the data in this file as a source for the simulation. Typically you do not have enough space in the internal flash memory for Blackbox log, so do you have to go the way with the file. The file contents will be feed the FC or a simulator with the same filter calculations. The output will be recorded as usual in the flash memory. Then you can analyze the new btfl_001.bbl like always. Instead of flying and gather the sensor data the data from the file are the source. And this could be done with CLI commands? No way.

[@maryjane136]

@@cinemoriahFPV Sorry, but you didn't understand it. There are no CLI commands or any other solution.

[@elmarirony5580]

Hello Chris! Just 1 question to You: The Filter Tuning/RPM-Filtering works only with Stm32-Esc or also with Standard ESC? Thanks / BR Elmar

[@shotgun2063]

I wonder if I'm doing something wrong, because my graphs never look anything like that.

[@sayfclans1738]

hi, thx for the video. when u tape "get rpm_filter" in CLI. what is "rpm_filter_lpf_hz" for ? for me it 's lock at 150 hz. gl hf

[@ChrisRosser]

It controls how fast the notches move. Rpm data is noisy so you need to low pass filter it otherwise you get notches jumping all over the place and that causes problems.

[@sayfclans1738]

@@ChrisRosser thank you

[@johnwalter6410]

NONE of my graphs have this long white shape in the red. All the white is at the begining of the graph. and the colors only go to 60%. What am I doing wrong?

[@eisenverbieger82]

Why are you using the biquad filter instead of BT3? I read in several tutorials, that the filter of the type PT3 has a stronger filter effect and less delay compared to the biquad filter?

[@SeverSevernui-xp7gh]

Is something changed in pid tuning process comparing to your btfl 4.3 tuning series?? Those are 2 year old videos. Should I go through them, or they became irrelevant?????

[@schwarzflieger]

so, when BF4.5 will be officially released?