Betaflight 4.5 Filter Tuning

[@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.

[@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

[@guitaro]

@@michaelo9071 I have heard you want to takeoff and do 3 throttle ramps. Hover close to the ground and then gradually and smoothly increase the throttle up to 100% over the course of 5-10 seconds. Repeat this 2 more times and then land and disarm. I think you can remove the takeoff and landing from your data in Blackbox Configurator by pressing "I" and "O" respectively.

[@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.

[@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. 😇

[@hemakumar8540]

This is very great video for explanation rpm filter

[@alexdefelice2448]

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

[@moonraker814]

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

[@jimmyarroyo356]

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

[@dabfpv]

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

[@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.

[@shawnschneider3685]

blackbox.betaflight.com/ at one point it because a web app. You can install it as a web app if you want it for off line viewing (like out in the field with out internet like I do) Hope that helps I am still trying to work through this tuning but the info in these videos has been a big help Install a web app On your computer, open Chrome. Go to a website you want to install. At the top right, select More Organize and then Save and share and then Install page as app. On some websites, at the top right of the address bar, select Install . To install the web app, follow the on-screen instructions.

[@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.

[@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😎

[@tootfpv]

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

[@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.

[@cbro1111]

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

[@RobertTheFriscoSchmid]

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

[@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😮?

[@jumpstartfpv]

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

[@rickburton72]

Great video chris

[@VasylDemianov]

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

[@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.

[@johncgibson4720]

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

[@lixxfpv]

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

[@yamasaur]

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

[@Mekanikern]

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

[@MrPepyaker]

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

[@sebcbien263]

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

[@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.

[@Nemesishk]

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

[@kmarlow1]

Very detailed explanation! Much appreciated!

[@jacekkaczmarczyk_drones]

Great video Chris, amazing work!!!!

[@DriftaholiC]

Awesome, looks like a retune for 4.5

[@dukedblu]

Thank you, explained very well

[@tictacX1]

Thanks!

[@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.

[@cineflight1171]

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

[@Mad_Voyager]

Great job! thank you sir!

[@vladyslavmaksymenko316]

bro thanks

[@batdronefpv]

THX for your great work 💥💥

[@1337plans]

Yeah buddy!

[@carterdavis5176]

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

[@Thomy_fpv]

Thank you 🫵🏼🙏🏼

[@Cloud1242]

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

[@demvlad2]

Thank You!

[@sancanhep2957]

that great

[@BenderFPV]

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! 😊

[@bawonohari7520]

Great, love that..

[@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.

[@AndreasFelix]

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

[@larstobler6047]

Danke!

[@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? 👍

[@PhilMangan-x9m]

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 ? 😎👍

[@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. 😢

[@fabiofilippini8659]

By looking the gyro noise spectrum on my 2 props geprc tern, rpm_filter_weights = 100,80,0 is worse than 100,80,100

[@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.

[@christopherconkright1317]

23:59 what do oscillations sound like?

[@kenimhof9333]

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

[@ungravityfpv]

BLESSS

[@dante9192]

Nice presentation about noise charts and filtering but what type of flight session should I do for this to be valid? Hover, slow steady flight or aggressive free style?

[@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?

[@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.

[@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.

[@sebastienboury]

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

[@jandomingo9806]

Wish u had a pid tune for a 2fiddy 4inch 1804 motors 2450kv. 😢

[@plop386]

2:55 no link in decription :)

[@antonmashko]

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

[@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.

[@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

[@n8zfpv]

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

[@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?

[@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 😂

[@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?

[@cervellimatteo]

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

[@pimpinrafa]

Great video! But I have a question. My blackbox logs are saved as BFL files, I believe I need BBL. What am I doign wrong?

[@shotgun2063]

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

[@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?

[@Sleeperknot]

Hey Chris, thanks for this super informative Video! Motivated by this video of yours, I just went ahead and installed Blackbox explorer and loaded the very first log I collected at half the loop frequency (4KHz). It shows Actual & Config Data log difference as 165:4000. Does this mean that my FC (SpeedyBee F405 V4) is only able to log at a rate of 165 Hz? I can't see anything beyond 82.5 Hz on the X Axis (Nyquist criteria, I guess - 165 Hz) even when I am fully zoomed out. In your video I can see frequencies up to 500Hz. How is that made possible? Appreciate your inputs!

[@sebastienboury]

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

[@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?

[@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?

[@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

[@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

[@captaindronieversefpv]

hi sir , want to ask , what about if we use 4 propellers ? can we use 4 Harmonics? thankyou

[@emmanuelcheveau4891]

Hi, Really interested by your tutorial. For my meteor65 pro, I prefer to stay with the stock BF = 4.3.0. If I follow your tutorial for BF = 4.5.0 will it be usefull for my meteor65 pro ??

[@benmintz3188]

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

[@serenestateofbeing1062]

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

[@vrj0]

For me on 4.5.1 Gyro RPM Filter is not visable in the FIlter Settings. Any idea?

[@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

[@belgarathlesorcier8385]

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

[@paparambo2557]

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

[@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

[@christopherconkright1317]

The link for blackbox isn't listed

[@kavorka8855]

frequency vs throttle doesn't show the red plot

[@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

[@unRealityFPV]

"check the links in the video description" There are no links!

[@randomdudefpv4927]

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

[@kuldar.]

Someone who flies Betafpv Meteor85 and has set up the filter, PID and rates according to this channel, please wrote me. I am new to fpv and would like to try your CLI.

[@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.

[@Moroder_Drone]

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