Testing BLHeli 32 Features (current limiting, timing, & max acceleration)

By the way I'm using D shot 1200. So far it's worked great. No issues, no desyncs, no fried ESCs.
The last BLHeli 32 video and how to get the passthrough working - • Lets Talk BLHeli 32 / ...
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[@mervinmoodley7618]

RIP my friend you will be truly missed

[@SapekQ]

What happened? Sorry because Im new to this channel

[@bobbin69]

SapekQ He was in a motorcycle accident. RIP :(

[@tommysmith2908]

Great video JC. Thanks for the information!

[@paulvallejo]

I have wraiths on two of my quads. I used betaflight 3.2 so I could set up the motor direction and LED colour using blheli then went straight back to 3.1.7. They fly so well on stock settings, unless some new info comes out they're staying like that. Love the videos dude, they've really helped

[@regularpixel]

I really enjoy your videos, Thank you for the informative content!

[@wesp3181]

RIP

[@vazza69]

RIP

[@sutoposidiklawajo8977]

I learned so much from you. 😭

[@rcwck]

Pitching down to the left at full throttle with current limiting might be contributed to the different current sensing accuracy of each ESC. If current sensing or performance of each ESC/motor is a large variant then it seems possible that flight problems at full or near full throttle might occur. It might be interesting to increase the current limiting to the left front motor to see it that dipping reaction ceases. Temp sensing would be a nice touch when messing about with timing/props/# of cells. Some RC car ESC's have that ability and will shut down to protect from a melt down.

[@miromir237]

Thanks for the update. Looking forward to your next experiences.

[@ProppedNutFPV]

R.I.P.

[@mooosestang]

Hmmm, is current limiting set by default and what's it set too. I didn't even notice what mine were when setting them up, now i have to flash back to bf3.2 in order to check.

[@Sandokans]

Hi. So for curent limit of the esc, that will save burning The 4in 1 esc?!

[@DrohneschweizCh]

Do you think using d1200 BLheli32 is not necesary to use a capacitor and /or DC filter?

[@benjaminschippers3536]

Is there any guides for flashing your FC to betaflight 3.2? I'd love to try a set of blheli 32s but the nightly build firmware required on the FC is a bit daunting

[@Bobby11]

Hmm Blheli 32 should be pretty good. Its about time, I do like current limiting the most out of the new features.

[@alexdij4025]

I would think that current limiting would reduce the response of the motor. The current will spike when you have sharp inputs and with current limiting on I feel it would reduce motor response. Aren't we always after improving throttle response? Do ESCs really cook that often that you need something like that? I fly pretty hard and with 30a ESCs (Spedix ES30HV) I've never burnt one up in probably 80+ flights.

[@colelandreneau304]

your not the only one who burned their quad to the ground with ESC fire

[@3rd_coast223]

Accel limiting is there (I would assume anyways) to reduce inrush current. I think of this like a VFD vs across the line starter for a standard 3 phase motor. an across the line starter will go to full speed right away and have 4 times the amount of inrush current than sustained operation where as a VFD will have a ramp rate (usually user defined) that will only allow said motor to ramp up at that rate regardless of what is being commanded, not only limiting the current but also limiting the rate at which the motor speeds up (obviously) usually for the service the motor is in. at least this is what I deal with in my work situation. For an ESC I would think that its merely for inrush current spikes. I notice on my OSD a lot of times I will see a really high number in amp draw after a flight on the statistics screen. lets say for instance ill see 122 amps, but when I play back my DVR I will never see over 97 amps during the flight. well my educated guess would be that is inrush that is instantaneous and literally happens in the millisecond/ nano second rate and happens faster than the refresh rate of my OSD. I would bet that limiting the accel rate would reduce that significantly. anyways that's my thoughts on the subject.

[@einsteind]

I noticed the other day looking at the specification of zoe fpv 2207 2400kv motors they tell you the timing so perhaps in the near future it will be a common thing to see,, I've just never seen it before, now I know its possibly for the blheli 32 Features

[@danieldimitri6133]

acceleration limiting is probably a way to prevent a motor desync it could effectively reduce amp draw except for when the prop is very loaded. but I think in the future telemetry of the ESC limits and real world room could stabilize the PID loop. the algorithm could plot reasonable expectations of the motor so their speed isn't behind the curve and then corrections will take fewer loop cycles, the feedback would be more to correct for air movement and outside forces on the craft. timing is a different can of worms, especially with gasoline engines. it's off topic for a drone channel but an engines timing limit is usually when the engine knocks. the old-school thought was an engine that takes more timing was more knock tolerant but it might just burn slower and let the piston get out of the way so the pressure doesn't raise as fast. the new thought is that if you burn the fuel faster you can ignite it all through normal flame travel before it auto ignites. this also requires a lot of wet flow testing to make sure the fuel doesn't separate and pool and the mix flows in a way that the flame reaches the whole cylinder. because of the fast burn of modern engines the ignition advance is often low. but the closer you can get to the limit the more efficient the engine is. it's just the limit that's less advanced. as a cylinder gets larger the ratio of swirl and tumble speed to the crank speed gets harder to maintain so on a racecar they usually compromise air speed to get flow the stretch out the piston speed.. but strictly speaking on identical engines you generally will get better efficiency from the more advanced timing, not the less. with electric motors I don't know everything but if you have a small stator and a heavy prop load you will get more torque and prevent slipping/desync with less timing. more timing will kinda fake a higher motor kv. when the telemetry is available it might someday be possible to map timing on an rpm/current map so you can grab a few extra rpm when the props unload and current starts going down if the bl heli guys ever see a use for that feature.

[@schumata3356]

Kiss ESC's come with current sensor,current limiting and don't require any calibration. As long as you're using the kiss flight controller, everything works right out of the box. I don't know how they do it but they do it. You should ping the kiss guys on RC groups for some background. They are very responsive.

[@pippifpv]

couldnt you use the Max acceleration kind of a filter to avoid the motors getting too hot, say if you break a prop and the flight controller is giving the esc's a lot of noise. the Max acceleration could smoothen the signal out. or does it only work on on acceleration and not deacelleration

[@ProjectBlueFalcon]

I'm not positive but I dont think that would be worked into the algorithm. The motors get hot because with a bend prop the D term comes into effect. But after thinking about it I do think the max acceleration would be good for more precision. Sort of how we use expo to fine tune how precise we want the throttle with movement of the sticks.

[@KevinFrenchpiisceiss]

Nice vape😄

[@mrozu1337]

You don't have to calibrate current limiting in specific ESC, because the hardware is known. Shunt resistance, gain of the op-amp and the circuitry are constant (within tolerance). With your flight controllers you are not callibrating any current sensor. You are just tweaking factors in the software to read the measured voltage on ADC in amps according to the hardware.

[@jimbrown563]

Instantaneous acceleration causes a really severe current spike. Slowing down acceleration smooths-out that spike, creating less stress on everything, including the magnets.

[@ArkMan70]

I'm guessing you could use acceleration limiting to make your quad less jerky and smoother. this could be used to make your video smoother.

[@petermcgill7356]

acceleration limiting might be good for making a high kv motor good for 2 uses, freestyle and racing! for example max acceleration for racing but if you want to use the same high kv motor for freestyle you could smooth out the motor by limiting the acceleration ramp up therefore making it smoother? Just my thoughts!

[@ProjectBlueFalcon]

Yea I think you're really on to something. I was thinking about this after the video. Sort of like how expo gives us more control with the sticks, acceleration limiting should also help with this.

[@RobB_VK6ES]

Potentially the major benefit as I see it is going to be battery care. By power and acceleration limiting there is also potential to increase flight times with little performance loss.

[@kennethcartman473]

i thought you could use max acceleration to stop desync when over porp'ed yet still wanting max power.

[@SpoonFPV]

Dude, I struggled so much with BF3.2.0 builds, my work around was...Flash 3.2.0beta set ESC, flash back 3.1.7 and dshot 1200 works on 3.1.7 just like you showed through the CLI tab, there is no reason to actually fly the 3.2.0 beta versions.

[@AxelC2020]

DShot is more reliable than multishot, but per se a desync event is completely different from ESC receiving/interpreting incorrectly data from FC. A desync is when ESC fails to properly time commutation of the motor phases.

[@BBFPV]

FC/PID can't do its work if the ESC current limit is on and it will flip, so i think i dont need it... a simple way is to checking the temperature, it will tell when the bearing or the shaft is damaged.

[@colelandreneau304]

what is ESC timing

[@ProjectBlueFalcon]

Without offsetting the timing the motors wouldn't spin, or control which way the motors spin. But this allows you to control how much offset there is. Too little and you wont get max thrust, but also too much timing will keep from getting max thrust.

[@kubburdigital]

I would think that acceleration limiting would be to prevent motor stalling

[@ellingolsen3194]

I don't know, but guess that if you do a punch-out test with current limiting set too low your quad will not rise vertically.

[@loosepropfpv7200]

Rip bro!!

[@brendand.2269]

Well at least you did some “test” literally all of KZbin and not a single technical video on esc settings with actual scientific testing on timing or demag compensation. Just peoples opinions. All I know is if I was a full time you tuber with 500k subscribers I’d be able to make wayyyyy better videos then just giving opinions. Unfortunately quads are wayyy behind due to the community’s lack of real scientific data. We need a KZbin who’s willing to do real testing on all manufacturers components and show logs, voltage spikes, current data, flight times, batteries from every company and not just a handful

[@olelillevik6389]

You dont need to calibrate current measurement . Typical tolerance on a shunt resistor is 1% . Bad design or cheep components may be the case where calibration is needed.

[@ellingolsen3194]

the current measurement is affected by a number of factors: Shunt resistor tolerance Gain resistor tolerance Tolerance of resistors internal to the INA169 chip Supply voltage to the processor (it is used as reference voltage for the ADC)

[@olelillevik6389]

Maybe 2-5% error then. So no need for calibration by my standards. I'm not sure about linearity, dynamic bandwidth, and common mode voltage.

[@ellingolsen3194]

You may be right. There are a couple of things I would like to add though: - When you are dealing with resistor values as low as 0.0005 ohm, then the quality of the soldering job is important. - The INA169 usually needs offset adjustment - For the best possible measurements it is necessary to remove some ESC noise. Either near each ESC or near the INA169 with low ESR caps. This should be done before adjusting the offset. My 10 cents only, nothing more, nothing less.

[@redeemed1228]

Rip

[@CoppertopFPV]

And following this video I'll be avoiding them. Too much messing around.

[@zaporniska]

quit smoking...lol

[@bwanaPele]

RIP