Betaflight vs Kiss: Who's Using the Better Dshot?

[chibikaiju]

Most pilots just put their head down during the walk of shame to pickup their crashed quads...JB puts out an informative video during his walk 😂 thanks Joshua, interesting topic that is unfortunately over my head, been running dshot600 forever.

[davidsaintonge]

Funny how the landscape is stabilized and JB all shaky. 😆

[kandredfpv]

@7:05 the DShot error rate displayed in Betaflight is for corrupted bidirectional DSHOT telemetry packets received by the FC, but what you're talking about are corrupted packets received by the ESC. To my knowledge BF does not have a way of viewing this as the ESC would need to report the stats back as telemetry data.

The other important point that you could have touched on is that motors have momentum and can't change their speed immediately, so even the DSHOT300 53.3us packets in an 8k PID loop (125us period) are way more frequent than they need to be.

[LivyuFPV]

The only thing is... Dshot out uses a different timer than the PID loop. So if your new motor value spilled out by the fc ends up in the middle or just after a new Dshot string is sent you will have to either wait for a new string or discard that new value. With a higher Dshot speed your new values will reach the esc faster. Dshot has a CRC function you could use.

[angryprobes]

You ok there Buddy. Don't have a heart attack we need you here.

[josefdahari]

Lol I know the post you were talking about 🤪🤪. Great video. We were just discussing this. Now also we have s2m protocol for Fettec Alpha on Fettec escs

[jwhitaker]

Thank you for this confirmation of the research and understanding I have done and have on this subject. Much appreciated man.

[JEFF-P-V]

Nice. Good video, I've often wondered why there were so many options.

[sickboy]

currently takin a digital time signals course. EE baby!

[calebd]

Good job explaining this Joshua. I think a lot of people didn’t understand the differences of running dshot 300 or 600 with the bmi gyro, including myself.

[fpvgiggles]

Based on the comments, I think we will need another more in depth vid!!! Looking forward to this! Ty JB

[TimeFadesMemoryLasts]

You forget to mention the difference between normal Dshot and Bidirectional Dshot. KISS doesn't use bidir Dshot but BF does. If you use bidir Dshot you have new challenges because you basically need to use a one way street for traffic from both directions. That means bidir Dshot 600 can only use half of the bandwidth of normal Dshot 600

[douglasyoung]

I usually just use dshot 600 as my default, my quads outperform my reflexes already😮. Get your exercise in boss, we need you👍

[Quick-Flash]

Bardwell, dshot 150 can run at 8k. Dshot 600 can technically run at 32k with very small reset time. With a realistic signal reset time dshot 300 can hit 8k pidloops. Dshot 2400 can do 64k pidloops with realistic reset time. Dshot 4800 is possible and only emuflight uses it.

[RCOverKill]

I'm glad default, and presets work pretty well. I just want to fly, yall are hurting my head🤣

[Jameswrightdavid]

With all the videos of your house and also liftoff I feel like I've been there 😂

[funkynerd_com]

So what I took from this is, because my race quads work fine with BF and DSHOT600, just leave it and keep doing teh funs.

[craigjordan]

Hmm I'm confused? If the PID loop is 125us @ 8K and D shot packet is 16 bits making the D shot 600 (25.6us) and D shot 300 (52.8 us) how does the PID loop out run the D shot packet? Is there more than 1 D dshot packet. Excuse my ignorance but this info you are giving seems very important to the quad set up. Thank you for sharing this info Joshua.

[MountaineerFPV]

You are starting to remind me of Captain Spaulding from Rob Zombie’s Horror Movies.

That is a compliment. 😂😂👍👍🇺🇸

[MrStevegibb]

My understanding was that dhsot 600 should have a transmit period of about 26.7 uS and therefore dshot 300 should have 53.3 uS which would be fine to use with a 8khz pid loop and its 125us loop time.

I know on a quad that has a bb1 with blujay I use dshot150 with a 4k pid loop and it works fine. Which would be a 250us loop and 106.7 uS transmit time for esc signal.