Betaflight Dynamic Filter | HOW TO TUNE

[@wlgrd7052]

Dynamic filtering really changed how I'm able to fly, it's just amazing. Thank you for mentioning disabling of the D Term notch. I have been really afraid of touching that, but will caaarefully try it after this :)

[@retrodudefpv]

It's great that you cover seemingly basic stuff as well as the more intensive tutorials.

[@michaeljohnson6473]

A new video explaining how to tune both dynamic filters in the new configurator would be a very popular video I bet... Thanks for all your hard work!!

[@tomprice3291]

Yes. I was really hoping for this. The new configurator is so different that this is hard to follow.

[@saschakretz400]

Hey JB. Thanx for this. I could do all steps and motors stay like ice cream with quite high P's. And the handling... that's... that's a f*****g dream! By the way. Step 4 was essential for me. Changed the world and I was really happy on cold motors.

[@MookMan]

Cheers, I've just upgraded to an F4 board (CL Racing F4S - great) and was going to have a tinker at this. It may be straight forward but, I'm pretty sure I learn something new and get a deeper understanding of not just what to do, but why it's done, with nearly every video so thanks.

[@Six2226]

The spilt screen, bf on one side and you on the other......PERFECT !!!!

[@terryallen3550]

Don't worry too much brother, I haven't even got a channel and can't keep up with what I've done. It gets huge the more time goes on. Been a while since I've watched any quad, fpv stuff. Hope you and your family are doing awesome enough. And killin it on the fpv front. :-)

[@MCsCreations]

Joshua, I build a little brushed quad with a cheap F3 board. Installed Butterflight, enabled dynamic filters, disabled all notch filters and set it up to 8k/4k. CPU usage, if I'm not mistaken, is around 27% or something like that. It's working wonderfully! It's only defect is the pilot. 😂

[@akera9625]

yes man! it's easy things.... ...only and, AGAIN, ONLY after you talk and show it to us. ....thanks to doing this. Seriously, thank you so much!!!!

[@brendanzaebst9011]

Thanks as always Josh, videos are always great quality and super informative...everyday look forward to your videos!!!

[@ArchmageAU]

Perfect timing. Have a Bfight 210 on BF 3.2.1 that needs dynamic filter tuning tomorrow.

[@rcwck]

Glad you covered the too hot aspect. Electric RC car racers have been using temp guns for years. 140F is a good high temp mark for electric motors.

[@JoshuaBardwell]

In my experience, a temp gun is tricky to use. Depending on exactly where you point it, it can read very differently. The temp I'm most concerned about is the temp of the windings because that's what will burn (the enamel, specifically). I'm not convinced that temping the bell is the most reliable way of doing it. But then again I guess if you are touching the bell with your fingers, you're temping the bell...

[@rcwck]

With a temp gun you shoot at lotsa different locations and soon you learn the hottest spots. On an outrunner motor it's quite easy to shoot the windings and the windings appear to be the hottest spot. On inrunner motors as rc cars use it's almost impossible to temp check the windings accurately. The wire coatings burn at a much higher temp that 140F. I find that in racing rc cars that the power drops as the temp increases over that 140F mark. The decrease in performance is noticeable and assume it comes from the heat decreasing the magnetic field and increasing the IR on the motor.

[@ricktucker7560]

Your a scholar and a saint. Thank you for your work.

[@Umsterdam]

Thanks for the education and also thank you for the particular questions I have asked privatey.

[@the_vortex]

I've been flying for awhile now with all notch filters disable (DF on) and even with a bent or broken prop the motors don't get hot! Guess the DF works amazing well.

[@eklmwo]

Another great video. Thank you for yor work.

[@jeffreyodachowski6247]

I found the dynamic filter to be very useful. Now can I use any kind of prop I want to. before I could only use some Cyclones or high pitched racecraft. I couldn't use HQ 5043s or 5040s. my Motors would just have this vibration. I could see the props vibrating when they were idling. But now it's like night and day I turned it off and on to make sure its was helping. Why do I have to have this for my quad to handle lightweight props with less pitch? Seems to me like you should just be turned on at default

[@Lazigeek_]

Even though some things are simple, I always like to double check I'm doing them right :)

[@michaeljohnson6473]

The new dynamic filters look so different with the hi number and the low number being able to be tuned.. Not to mention the dynamic lowpass.. Do I set the hi for the dynamic notch as high as the dynamic lowpass is?? I would think yes..

[@fpvclub7256]

You did a quick how-to on this during one of your live streams. :)

[@sparrow082]

Just a dumb idea, feel free to ignore... To the best of your knowledge, has anyone ever put a quad in a vacuum chamber and measured the the actual noise the quad produces? You said something a while ago that got me on to this idea, I don't remember what. The end idea is something like an auto tune, call it freak-out mode. You fly the quad to a relatively high altitude like 200 to 250 ft then activate. The Quan would freak out for a second or two then return to normal flight. What it would be doing is measuring all the nose that it can actually here, then it would set the filters to ignore everything it just heard. ...?

[@TheHeliman9]

love your videos always smart and informative just curious how did you learn all this stuff about betaflight was it trial and error or did it just come to you naturally I understand most of betaflight but there's some things I believe most people out don't understand either keep rippn

[@tubechris]

I think you also said you would show us how to mod a laptop power supply to output XT60 for an iSDT charger.

[@FireDFPV]

I run F3 board with 8k/4k gyro/pid and the cpu load is 24%max so it should be fine? Actually I flew the quad a lot and there is no problem.

[@SkyCandyVisuals]

Hello @joshuabardwell from the past I'm looking on videos to help with tuning a tinywhoop. i want a more float feel to my mobula6 as it seems right now to drop like a rock. its flying on 1s 16000kv motors but i also have the 25000kv motors. i swapped from those because my flight times were like 2mins:( but now all my power is gone but i get close to 4mins but no "floaty" feel when performing acro. what would you suggest:") thanks JB, rj

[@lukasswann]

Would adding a filtering capasitor on battery (4in1 ESC) increase ones chaces to go through all the steps without geting motors hot?

[@JoshuaBardwell]

Yes.

[@TheXanUser]

any plans for 3.3 to have a emergency notch drop? so when you blow a prop apart and one motor suddenly vibes out really bad, it relaxes the loop and keeps from smoking that motor?

[@tyrian869]

Hey Joshua, has anyone ever asked you about high camera angle and yaw, Picture you are flying a quad in a straight line with high camera angle, and you want to do a quick turn around rolling would work better but wouldn't it be nice if you could use yaw command to do this? i find myself moving the camera in a U pattern, having it adaptable with the pitch of the aircraft might be nice, Tell me what you think. because if I yaw, the quad just spins in the direction that I'm heading in, not turning me around, I think the controls could be better setup that way IMO

[@JoshuaBardwell]

kzbin.info/www/bejne/Y6K8iYmOnq16fKM

[@tyrian869]

Joshua Bardwell, thanks but not the repply I was looking for, your video basically said suck it up and learn how to deal with it. But what if it did it automatically? Idk just some thoughts. And thank you

[@matthewherridge9430]

Just to clarify, when adjusting on the filter page and you change from biquad to PT1. Is this step one as in now test your quad for hot motors or is removal of the the first notch filter the time for first test. Just as i am going to be testing in the field so adjustments will have to be made on the bench prior to each flight.

[@JoshuaBardwell]

I would do PT1 first. Actually, I would enable dynamic filter first.

[@corinasoliz9130]

Your thoughts on doing this to a 3s setup? I tried it and was able to do all the steps. Wondering of your opinion if this is even beneficial. Thanks always for your helpful guides!

[@doupnetwork]

Wow. Thanks cuz I did not change to PT1... Plus I never turn off D term notch anyway

[@Newton1357]

I thought the first step after enabling the dynamic filter was to disable notch 1 and then notch 2. Then if all is good try switching to PT1. I believe I got this from one of your earlier videos on the topic.

[@JoshuaBardwell]

+Doug Fig I don't think i said that. If I did it was a mistake.

[@Newton1357]

Alrighty, guess I will go back and step through those again. Thanks!

[@bryceellington6195]

So do you PID tune before filter tuning, filter tune before PID tuning or PID tune then filter tune and then PID tune again? 🤪🙄

[@J4nkyFPV]

Great video - thanks for putting this out. Any reason you didn't have Air mode enabled?

[@BigWillieFPV]

When tuning from scratch do you tune with dynamic filter on, pt1, p, I & d filters off/on what’s your latest sequence thanks JB 👍🏻

[@JoshuaBardwell]

Here's my approach: kzbin.info/www/bejne/Z5e1lqakesmEY5Y

[@pippifpv]

Mr bardwell. My quadcopter flies really well on biquad, but when I turn to pt1 i start getting a lot of mid throttle oscilations. Do you think it is excessive d-gain and what i see is dterm oscilations? From bb it doesnt look like it is a really noisy quad i am working with

[@JoshuaBardwell]

Mid throttle oscillations are seldom caused by PID gains. You need to soft mount your FC or just leave the filters alone.

[@Plur307]

I've found that it depends on the F3 board if it can run 8k/8k and dynamic filters. My Motolab Cyclone can, my Motolab Tornado can't. I have no idea why. They have very different processor utilization running the same configuration.

[@timmac8049]

Hey JB, is it best to do PID tuning with dynamic notch filtering off? Im curious to know if it was enabled, would it mask some of the bad characteristics of the quads performance?

[@JoshuaBardwell]

Have a look at how I go about it here: kzbin.info/www/bejne/Z5e1lqakesmEY5Y

[@timmac8049]

Thank you🤙

[@TeamBlindMouse]

if I setup a brand new quad with new props and motors (and no screws touching windings) and the motors get HOT even at default settings with all filters on ....then what do I look at ??!!! 5inch quad on 4s with 2600 kv 2205 motor

[@centralpennrealtor]

I have a new build and not sure if I should PID tune first then, start disabling dynamic filters or... disable filters then PID tune?

[@JoshuaBardwell]

Check my "Alien vs. Chameleon" PID Tuning videos to see exactly how I do it. It's a bit of a back and forth. I usually go to PT1 and disable gyro notch 1 right out of the gate, and then proceed from there with PID tuning. After P and I are mostly correct, then I try disabling the other filters as part of D tuning.

[@DirtyRobot]

Hey Josh. I have two foots. I am not sure how to walk and want to know which foot I should start with. Some people say the left one and some people the right one. Could you make a vid that teaches people like me what the best option is, given that I might be wearing Nike one day and Adidas another.

[@DirtyRobot]

BTW. Some people say that Nike laces should be tied right-left while Adidas Left-right. Is this true?

[@momentum3825]

Joshua quick question: Im using the kakute F4! Great job writing the catalogue 👌 unfortunately i crashed and one of the data pad (m4) of the esc got pulled. What can i do to solder the thin white wire from the esc go the board? Im using the furibee fuuton 200 and upgraded the f4 board and everything was ok now i dont know what to do.

[@JoshuaBardwell]

kzbin.info/www/bejne/fKrWgXuubLd_b9U

[@momentum3825]

Joshua Bardwell drone guru 🙌🙌🙌

[@kawiman0611]

This may have been already asked. Do you tune, then start with with filters and fine tune? Or work off factory tune through filter adjustments? Or set D to zero reduce P & I and work through filters?

[@JoshuaBardwell]

kzbin.info/www/bejne/ooi5pIOPZdimaqs

[@kawiman0611]

Thank You

[@sebastiannobody1142]

FOR ME VERY IMPORTANT QUESTIONS: - What is faster (less deplay)? 1 to 2 static gyro notch filter OR just dynamic notch? - What's the need of enabling static notch filter(s) if dynamic is on? Should the dynamic filter not cover the static parts as well? So far, I have the best experience with my Martian II frame + 2205 2300kV motors to have just Gyro Notch 1 (245 Hz center) and D-Term Notch on (and of course PT1). Dynamic Notch just added propwash back again. My other DALRC X215 frame + same motors is more tricky. Here I need Gyro Notch 1+2 and D-Term-Notch to be on. And since dynamic notch is out this is on, too. This all helped a lot to for better overall flight performance.

[@JoshuaBardwell]

Dynamic notch latency is impossible to generalize. Its width is dynamic. So its latency changes.

[@sebastiannobody1142]

But it must be more as a scan of the gyro raw data is needed. The static filters are fixed manually, thus no analysis needed. So in my understanding its faster to work with a static filter. If you crash a lot or fly at different altitudes or temperatures the dynamic filter is more handy. And what about using static on top of dynamic? Is it usefull?

[@aowi7280]

I noticed when you disable a filter, the freq and cutoff freq go to zero in the video. Do I need to do that or is flipping the switch enough to turn it off?

[@JoshuaBardwell]

Flipping the switch is enough.

[@esadmuric7839]

One question. Is for amater new fpv pilot, like me, better to disable or enable dynamic filtering. I crash a lot, so will that do more or less damage to my esc's and motors? Please help. Thanks

[@JoshuaBardwell]

Enable. Much better for banged up props.

[@esadmuric7839]

Joshua Bardwell thank you Josh. Will do that.

[@MrStevegibb]

How about switching the dterm notch for biquad dterm lpf ? that way the dynamic can just notch the particularly noisy parts and not mute potentially useful data.

[@JoshuaBardwell]

I would never, ever suggest turning off the d term lowpass. Much too high a risk of burned motors.

[@MrStevegibb]

Erm no I meant I think it would be better to disable all the notches before changing the LPF from biquad to pt1. My reasoning for this is that notches are very aggressive at there center frequency and for that reason need to be set very precisely or you could end up loosing useful information.

[@du4-fpv777]

I could have sworn that you went over that when you talked about downloading 3.2 before it was released.

[@JoshuaBardwell]

IDK but anyway here it is! LOL.

[@du4-fpv777]

Joshua Bardwell all good I still learned something new or missed. Thanks for all your videos!

[@joeynuggetz]

I don't understand why we have to "tune" a "dynamic" filter. :-)

[@Coreycry]

You can modify the nature of the dynamism, how it's allowed to operate in the time. For instance, discarding certain frequencies at specific states.

[@JoshuaBardwell]

You aren't really tuning the dynamic filter, which tunes itself as you expect. You're really tuning the static filters, which interact with the dynamic filter.

[@joeynuggetz]

Right so why do we need any static filters if there are dynamic ones. Always did my head in :-)

[@RCSurf]

so the only benefit is to cut latency - i remember when each filter was added and each was an advantage and a smoother quieter quad , with less all around noise and vibration .. whats the benefit to using dynamic ??

[@tyrian869]

So I turned Dynamic and all the filters off and have a soft mounted gyro would this be the best solution? And Joshua didn't you say the dynamic filter added latency?

[@Politicallyhomeless957]

You need to do a vid on RF and what’s going on right now.

[@christianprogrammer9131]

Time to do this this again for the new beta flight 4

[@JoshuaBardwell]

It doesn't release until April.

[@pippifpv]

Would removing all the dterm filters also make the tune require lower dterm?

[@JoshuaBardwell]

Yes, but maybe not for the reason you think. Removing the filtering would result in hotter motors, which would require lower D gain to avoid smoking the motors.

[@marene76]

Hey Joshua big fan of your channel. I got a quick question for you I’ve tried to lower the Gyro notch filters one at the time and can’t get them to save at 0 After saving I close Betaflight only to return and find everything back at 400 etc is there something I’m missing? Any help would be greatly appreciated. Thnx

[@JoshuaBardwell]

+Dr FPV use the radio button to turn them off. Like I show in the video.

[@hateeternalmaver]

Hey Joshua, thanks for the video. I have a few questions: Does it only work if you're doing everything or could you stop at every step? I mean, so far I have just enabled Dynamic Filtering but haven't touched anything else. Does that even make sense? I would love to test at least the PT1 thing, but will that even have any effect without removing the Notch Filters? Sorry if that all sounds weird, maybe I'm thinking funny... Happy flying Josh!

[@JoshuaBardwell]

+hateeternalmaver you can stop at any step.

[@imemyself2820]

I sometimes wonder if racing is the endgame of quadcopters? I admit I just came into this hobby, but the amount of people focused on racing vs long range or programming or whatever, is quite significant. Is there no such thing as an "all-round" or AIO quad?

[@VilleF1N]

Every freestyle quad could be described as AIO. They usually have enough power for racing at low to medium levels maybe even at high level, they can be used for long range with TBS Crossfire and bigger battery, altho i'd suggest lower Kv motors and 6" build for more range at a cost of punch out power and top speed. Of course a dedicated build for each purpose is always going to do better, but if you don't know what exactly you wanna do or can't afford to build more than 1 quad, then a freestyle build is the option to go with.

[@imemyself2820]

Thanks for replying so fast, VilleF1N. It's just, freestyle and racing quads are rarely carrying features like sensors, autonomous functions etc they are very simple racers.

[@VilleF1N]

True enough. There just isn't much point in having sensors on these kinds of quads. For one thing, they add weight and when you add autonomy to them, it takes the fun out of them. But DJI to the rescue for those who want their quad to basically fly it self while you just look at the pretty camera feed. That said, there are GPS and sonar modules designed for small quads like what we fly and Betaflight even supports them. You just have to find a bigger frame to fit all that stuff into, like ImpulseRC Alien or even Lumenier QAV-R would most likely do the job.

[@imemyself2820]

Thank you so much, I think I like building and the challenge more than buying DJI and those are cool frames. Nice to talk to you 👍

[@VilleF1N]

iMeMySelf You're welcome :)

[@frankyoualot]

Does enabling Dynamic Filter affect flight characteristics? Latency I suppose, but more the feel?

[@JoshuaBardwell]

The dynamic filter should be the last one you turn off when trying to reduce latency and improve direct flight feel. Well, actually, you should never turn it off. If ou turn off all the other filters and manage to not smoke your motors, you'll have hardly any latency. If you then turn off your dynamic filter, you'll probably smoke your motors.

[@frankyoualot]

This is a so important because I turned it off for testing and yes, super hot motors. 1106-6000kv motors seem to run hot anyhow so I've been trying to cool them off - the screws are super hot, and I watched your vid about hot motors and there is no continuity happening. Thank you so much P.S. A flight controller seems like an analog noise controller the more I learn about filtering!

[@ahsanzahid7959]

I am having issue of hot motors in BF 4.0.3 should I turn it to PT1 by default it is biquad?

[@TimeFadesMemoryLasts]

You can try lowering your D-term first. In BF4 raising and lowering the D-term has a more dramatic effect than in earlier versions. If you still get hot motors try lowering the D-term Low Pass Filter. I have it set to 200Hz but try 100Hz or 50Hz as well. You will get more vibrations but your motors will stay cooler.

[@1337flite]

I think you promised to make a video about tuning anti gravity in (I think) your Betaflight 3.2 set up video.

[@JoshuaBardwell]

Step 1: Raise anti_gravity_gain until the quad holds firm on punchout or throttle chop. Step 2: If you get to about 8 or 10, something is wrong with your setup.

[@Craig_Barker]

JB sorry for been off topic but is there a reason for the I2C error to show I2C error 1 on my Matek F405 OSD FC...

[@JoshuaBardwell]

There are always a few errors as the i2c bus initializes. As long as the number is not increasing ignore it.

[@Craig_Barker]

Joshua Bardwell ahh brilliant I can now rest my mind ... thanks

[@confined9523]

If the motors heat up when D-Term notch is disabled, can you just lower the value of the number to try and get the most of it?

[@JoshuaBardwell]

Lower the value of which number? The way the notch works, simply lowering the frequency value will not have the effect you are looking for. It's not like a lowpass filter where raising or lowering the value controls the amount of filtering.

[@confined9523]

Ahhhh now i get it, that makes sense. Apologies, noob here :P Without your and knowledge, I wouldnt be flying at all. Much appreciated for all the time you put into this mate. Cheers!

[@joewakeman1250]

My first thought when reading the video title was.. again? But it's probably nice to have this content in a nice concise appropriately titled little package as opposed to buried in a larger betaflight 3.2 setup video

[@JoshuaBardwell]

Yes, exactly. I know I have covered this before but not in a video that will actually show up in the right search term. I think.

[@Alvin-ti3fw]

That's new.. I didn't know they already put a switch for the filters instead of lowering them to Zero to disable them.

[@charliedoubl]

hey everyone. I've been trying to figure this out but i can't seem to. I just built my whoop and I'm loving it, but whenever i move the throttle or even pitch forward, the whoop always yaws to the right. is anyone else having this problem? do you have any suggestions on how to fix it? any help is appreciated, thank you:)

[@jeramiebentley4054]

is it necessary to run these filters? My armattan rooster came with them turned off. I Just put your board in my hyperlow build and installed the latest firmware but i don't know if i need to run these filers?

[@JoshuaBardwell]

It's only necessary if you have enabled 32k gyro sampling mode.

[@jeramiebentley4054]

ok im not. Also love the lay out of the board BTW. Makes for a clean build especially in low profile builds.

[@roobidesign]

Can I do it in the betaflight osd? (I usually dont have my laptop with me)

[@mrmurder75]

Robert Kovacs if you have a taranis, you can do it via the lua script.

[@DangerDavefpv]

Weird question no relationship to video, do u think that running sbus with only 8 channels would have less latency than 16? I've been curious on this for a while, I can't tell when changing on x9d

[@VilleF1N]

I've been wondering the same as well. I have done some tests, but the only big difference im noticing is when im tuning the RC Interpolation. The difference is that when i have the Taranis in D8 mode i can use value of 13 for RC Interpolation and get a clean RC curve. But, when i set my Taranis to D16 however, i can't get the RC curve clean no matter which value i use(JB has a video on how to tune RC Interpolation, if im not making any sense). I suppose there is some slight difference in feel with D8 mode and as i understand it, it's slightly faster than D16 mode. So it does make sense that i'd feel my quad respond slightly faster in D8 mode.

[@JoshuaBardwell]

+Danger Davefpv yes it has less latency.

[@DangerDavefpv]

Joshua Bardwell well that's good to know, I know it's not dramatically different and I've even thought about the tbs crossfire I flew a crossfire and seemed like longer range the latency was way better in same area where I had xm+ it seemed more responsive like I was connected,now longer range if u listen to quad it seems like there is delay but it is delay with sound traveling

[@MsKoffeinjunky]

What if I have all three filters disabled but did not activate dynamic notchfiltering in config? Seems like that is what I have been doing, is this complete nonsense or was it like this in earlier versions. And does it make a differnece in performance?

[@JoshuaBardwell]

If you do that, you will have lower latency and less filtering. The main risk is that a sudden change in vibration (like a bent or broken prop) will burn a motor. The dynamic filter can respond to this, but the static filters can't.

[@MsKoffeinjunky]

Wow answered by the master himself ;). Your videos helped me soo much over the last couple of years, thanks alot! So if I understand this right, it is riskier but could perform better in theorie. Running 8k 4k dshot600 acc and everything i dont need disabled on a Omnibus F3 Cpu load on my bench only 17% I had some rolls of death after fast flips with two of my quads but were pretty sure, until now, this was due to battery sag because the fc rebooted after the crash and it did not happen with a fresh battery. I also flew back to me with one prop missing a blade, bad vibrations but kept it in the air. How many more filters ( or layers of filtering) are there after I disabled the three filters you mentioned in your video? I dont want to go too deep into the topic but I had one semester about feedback control systems and a vague understanding what is going on there, and for quads I sadly just did what people like you suggested without understanding much. Is there a nice source to read into it other than bori`s rcforum posts, something more visual?

[@JoshuaBardwell]

Honestly the FC should never reboot from battery sag. How low does the battery sag, worst case? 9 volts? This is a completely totally destroyed 4S battery but it is still more than enough to keep the FC's 5v regulator alive. If the FC is rebooting due to brown-out, then the regulator on the FC is defective or badly designed in my opinion. These are all of the filters that there are.

[@MsKoffeinjunky]

It most of the times happend on my small 95mm build.1105 motors and 2 inch props, flies like a charm. Punchouts drop it to 6.2V on 2S. On 3s the sag is not as pronounced. And deathrolls only happened if I use full 1200deg/s rollrate. Maybe a related topic: Do you set motor max value to 2000 in blheli and bf for dshot escs? Some time ago you had to leave some room for the fc to act around 1970 if Im not mixing up stuff now (put the hobby on freeze over last winter and maybe missed a bit when catching up)

[@joshfedecente]

hey Joshua, hi! please help me, I did all that you said and my motor are still getting hot. motors:raceone 2750kv 2306 esc:ufofpv 30a 1200dhsot FC: omnibus f4 with BF 3.2.5 i didn't touch the PID´s, the motors have soft mount, and the frame its an alien 5" modded, almost like Martian III Thanks a lot for your help!

[@joshfedecente]

oh, props GEPRC 5040

[@JoshuaBardwell]

Have you checked this: kzbin.info/www/bejne/m6CVpJ2Kg7hjpsU

[@joshfedecente]

Joshua Bardwell yep, i watched and i did every thing that you said, and nothing. I check every part of the quad twice and all is ok. With soft mount i reduce the hot in 30% maybe. But it’s not enough

[@MrSutekii]

Dont think this is for me personally, I fly Dal props which easily survive crashes but xan get bent out of shape...and I typically dont bother changes props till they are nearly origami or bent back so many times Im not even sure what they looked like to begin with. I must ask tho, what is th correlation between how the FC 'sees' oscillation? For instance, when PID tuning, this is a response to error, but at what point is the FC able to recognise those errors to be oscillation as opposed to just a series or error points?

[@ASJC27]

I think this is actually an argument in favor of using dynamic filter. It responds to changes in vibration frequencies so it is very good if you fly with damaged props as it will adapt to that. In my experience ever since I started using dynamic filter I can keep flying with damage that previously was too much.

[@JoshuaBardwell]

The FC never "sees" oscillation. It just sees and tries to correct for error, regardless of type or cause.

[@MrSutekii]

Joshua Bardwell that being the case, how does it know at what frequency to ignore oscillations?

[@vinnnocc]

since 3.3 is out do we still run PT1 or biquad?

[@JoshuaBardwell]

Nothing has changed about this advice. And 3.3. is not out. It's RC1 for gosh sakes. It'll be a month and at least one MAJOR feature revision before they actually release it, if history is any guide.

[@sebastiannobody1142]

SIDE QUESTION: What's the best setting for a F4 FC? 8K/8K or old school ratio -> 8k/4k ?!?!?

[@adamk.3946]

Sebastian Nobody 8k/8k works great with F4 boards

[@sebastiannobody1142]

I know. But is the final result in PID loop maybe better if you use that 1/2 ratio or is this an rule of the past now?

[@adamk.3946]

Sebastian Nobody I find that 8k/8k works best for me when comparing to 8k/4k or 4k/4k. Probably going to be different for others but that's my experience!

[@fuzzwad5049]

I use 16k/8k with DShot 1200 and dynamic filtering. No issues on my end.

[@JoshuaBardwell]

8k/8k. I have no idea what this 1/2 ratio you're talking about is. Sorry....

[@nothingnew69]

Small things are important.

[@MrBirdshell666]

What the point to keep gyro notches on? Wont they interfere with dynamically set notches?

[@JoshuaBardwell]

No, not at all. They are complimentary.

[@MrBirdshell666]

Joshua Bardwell, how excactly? Please explain

[@wheelhaus303]

Notch filters are static, they attenuate a frequency range you choose. The dynamic filter analyzes the data and seeks out the frequency with the highest noise and attenuates accordingly. If a notch filter is already set up properly (via black box freq logs and manual settings) then the dynamic filter can only see what’s left, and then seeks out whatever noise is the loudest. If your noise levels are really low after tuning filters manually, then the dynamic filter may actually be unnecessary. All filtering requires processing time, so less filtering improves the immediacy of flight control, but the additional filters do not really “interfere” with each other as you suspect. Only drawback is very slight delay to control, maybe imperceptible to some/most. As far as overall best latency performance I suspect PT1 manually set up notch filtering is the king as it uses the least processing, but takes a lot more work than the one-click dynamic filter. Im still learning this as well.

[@MrBirdshell666]

Dave Wheeler so, the dynamic filter is applied after notch filters? I thought othervise...

[@wheelhaus303]

I'm not sure which priority/order things are processed, that's a good point. The dynamic filter likely needs more aggregate data to determine where to apply attenuation, so I would assume it is processed in an entirely separate way than the normal notch filter. I am simply making the assumption, I'm not sure how it's programmed.

[@vikrambhamre5512]

HOW DO YOU SAVE IN THE CLI on beta flight 3.2.2. I can not save what I am doing? Pls help!

[@VilleF1N]

If they changed the command then type "help" in CLI, you'll get a list of commands.

[@JoshuaBardwell]

+vikram bhamre type "save"

[@vikrambhamre5512]

It does not save..

[@vikrambhamre5512]

I type "get" and it retains the previous result.

[@Fpv_Dad]

vikram bhamre yea happened to me once. can't remember it if was the usb cable or if reflashing helped. either one.

[@benjaminwinston4185]

Does "as fast as you want" on f4 and f7 include 16k or 32k?

[@JoshuaBardwell]

Betaflight 4.0 has dropped support for gyro sampling over 8k, so the question is moot :-)

[@benjaminwinston4185]

@@JoshuaBardwell interesting thank you. And thank you for your prompt reply. I'm in the middle of trying to learn about filtering to dial in an 8inch 2-blade prop camera platform for filming a friend's wedding and strolled on to this video while trying to understand the available band pass filters. I did a tune session earlier to remove seemingly P-wobble tune issues in a Holybro Kakute f7 board that has been hard-mounted to the frame. As I drove home I asked myself "why doesn't it just isolate the signals associated with the motor speeds it outputs". Seems like someone already had that though. Is the dynamic filter available only on 4.0 then?

[@benjaminwinston4185]

It wasn't P-wobble. I reduced the P to nearly nothing (having taken D down a lot in a prior session). It's definitely frame noise. At one point I had to land with incredible slop (if they could get a washing machine to fly, I could almost land it.. ;) ) but changing values I didn't quite understand via the OSD menu for general filtering seemed to improve things. I'm downloading the GoPro footage to see if it confirms my suspicions about the filtering improving the wobble.

[@GeorgeCooper_LoneWolf]

Hi Joshua, Well just when I thought I new everything about betaflight, you go and make another video lol Very interesting, keep them coming. And don't forget you promise to send me some free stuff ( Don't you remember ) lol

[@maine_iacfpv3237]

Have you heard of anyone having a problem with their betaflight f4 board not arming and if so do you know what the problem was ?

[@1337flite]

If you have an OSD turn on "warnings" in the OSD it will tell you at least some of the time what the issue. E.g. I've seen "nogyro" or "noprearm" before. You can also try to arm while attached to USB (take off your props) and then go into the CLI and type status. There's a code in the output. Theres a page on the Betaflight github wiki that tells you what the codes mean. github.com/betaflight/betaflight/wiki/Arming-Sequence-&-Safety

[@JoshuaBardwell]

kzbin.info/www/bejne/aZ6yln9um5aXg68

[@maine_iacfpv3237]

Joshua Bardwell thank you once again for your help the quadcopter industry wouldn't be the same without you

[@gamerfoo8287]

What would happen if you would stick on BIQUAD and simply switch off the filters below ?

[@JoshuaBardwell]

+Gamer Foo going to PT1 has a larger positive effect. Also if your motors get hot when going to biquad then you probably shouldn't try turning off the notches.

[@gamerfoo8287]

On 4 out of 5 quads following your instructions and disabling all 3 notch filters works fine for me without the motors getting hot. I have one quad where I can only disable the first 2 notch filters on PT1 and afterwards the motors run twitchy and hot. On this particular quad leaving BIQUAD and disabling all 3 notch filters seems to give me better results. No idea why. The build that is behaving a bit strange is using a Kakute F4 on the latest betaflight version and an racestar 4 in 1 running the most current Heli-S firmware with DSHOT 600

[@Politicallyhomeless957]

Déjà vu I swear you already made a video about this because I watched it lol that’s how I learned what to do with dynamic filtering. What would the FPV world do with out JB? The thought is terrifying 👍

[@DroneShotFPV]

You are not wrong, I watched the same video. It's the one where he FIRST announced the Betaflight 3.2 availability in the "RC" stages. if it wasn't the first one, it was the second one, I watched the same video as you because I couldn't quite remember which notches to "zero" out, as I thought there were more than 2 or 3 to set to zero for full functionality. lol

[@EliasLabordus]

You explained this so many times before already. Do people really want another video on this?

[@kitbuilt3845]

Obviously if people are asking for it, the answer to your question is yes.

[@JoshuaBardwell]

The advantage of this is that it is in a video with a descriptive title, all on its own, not buried in another build video. Amazing as it seems, not everybody watches every video of mine. New traffic comes in from search who has never watched any video of mine before.

[@dafadashamsta]

How the f... do you know all this? Thanks for sharing knowledge man. JB!

[@ninjasauce8855]

What, no blackbox?

[@JoshuaBardwell]

Nope. If the motors are warm or cool, good to go.

[@jdm724]

Jb i think you already explained this in previous vids. And this still doesnt say a thing about tuning the dynamic filter.

[@JoshuaBardwell]

+Danny Mars this is how you do it. There is no "tuning" of the filter itself. That's why it's dynamic. It tunes itself. The only tuning is, what other filters can or can't you disable.

[@KmanRuffian]

Joshua I think you really should come up with a better description of "How hot is too hot?" There is a great deal of variability in what people perceive as "too hot to keep your fingers on the motors..." I think to be scientific about it you should just figure out a temperature that goes along with this statement so that those of us with infrared thermometers can check motor temps. Just my two cents. Thanks as always for the great content, in addition to these two cents I also just became one of your Patrons...

[@EliasLabordus]

It's more a rule of thumb. The absolute temperatures would depend on the type of motors. The thing is, if it's too hot to hold in your hand, the motor will probably still be ok, but close to being too hot. So to keep a margin of error, if you can't hold it in your hand, it's too hot :) Stick to that rule and you'll be fine

[@KmanRuffian]

Yes I know it is a rule of thumb. But a temperature as a rule of thumb would be more precise and useful. Someone as knowlegeable and connected as Joshua should be able to get a rule of thumb temp from motor manufacturers. Or come up with one based on his experience and testing... Plus as someone who appreciates a scientific approach to things I would think he'd be interested in coming up with a rough safe temp.

[@darrinboadway]

thanks....cheers

[@bishopvick6373]

and i'm here like, flys alreet on stock pids

[@rawpicsfpv3516]

Excactly what i was looking for!... But why should you do this? I think i need a explanation for noobs;)

[@JoshuaBardwell]

Improves handling especially propwash performance.

[@rawpicsfpv3516]

Joshua Bardwell awsome, thank you for your answer and of course for all your videos. They are helping me a lot!!!

[@Vobe18]

I'm learned

[@ScraggleRoc]

Nothing against you but, Do people not know this is in almost every video you do that has some the slightest amount of tuning?? Has anyone requested a video explaining how to turn an X9D on yet? lol (I usually buy it a few drinks and dim the lights personally) badum-bum-tiss..

[@JoshuaBardwell]

I made this video because I don't think there is one video where I focus just on this issue. And it was very commonly requested. Making somebody sort through a 20 minute video to find the info they need isn't the best way of doing things.

[@ScraggleRoc]

I know, it was mostly jokes and slightly trolling. Although I would have had a lot more trouble getting into the sky without you. Thanks btw!

[@novelusfpv9946]

wow, after doing this i armed my quad and it just flew away without even giving a throttle input..

[@bmzbg]

wait.. what?? It flew away when you armed it or what?

[@novelusfpv9946]

@@bmzbg yeah..

[@importryderify]

360 =)

[@RicardoGelschleiter]

Hair!

[@mithunchopda]

Ricardo Gelschleiter Transplant

[@doupnetwork]

Wow. Thanks cuz I did not change to PT1... Plus I never turn off D term notch anyway