Stop Burning Motors with Betaflight RPM Alarm

---

00:00:00 - What fries motors?
00:01:01 - I didn't know this existed!

00:03:41 - How to enable this option
00:04:22 - This only works with ESC Telemetry RPM
00:06:20 - Want to learn more about Betaflight?

[minishrimp]

For anyone searching for the CLI:

set osd_esc_rpm_alarm = 1000
save

[snopyKS]

The value of 1000 is the RPM threshold. If the motor's RPM falls below this value, it will show the error.

[BrandonBeans]

I'm fairly certain you can enable the "Motor Diagnostics" OSD element and, using only bidirectional dshot, display for each motor the level commanded or an "S" if stalled. It won't pop up all cool like that warning but it's always there and helpful if you know how to use it.

[andoalon]

I just took a quick look in the code and the value is the RPM threshold below which the warning will be shown. I also noticed that the warning is supposed to work both with ESC telemetry or bidirectional DSHOT, so not sure what is going on there.

I don't want to post the link here because youtube tends to hide comments that post links, but the relevant code is in
(for ESC telemetry) and
(for bidirectional DSHOT)

Great video as always Joshua

[josefdahari]

Super cool feature. If I had this setup it would be blinking like a mad man!

[minkorrh]

Happened to me today. Was on the 3rd flight of an Apex 3" build, was flying beautifully and smooth with an JHEMCU AIO 45A, Ant motors 1408/3800kv, 4s, and clipped a tree branch. No problem as I pretty much knew where it went down. Spent 15 mins looking for it and couldn't see it. I knew I was close so I armed and disarmed quickly twice to hear a spin, but heard a 'popping' sound. Turned around and saw the thing on fire on the flat grass where I missed it Definitely lost 2 motors and the AIO. Last time I use one of those AIO for anything except tiny whoop motors. I've done this repeatedly for the last 6 years to find quads with separate FC/ESC boards and never popped an ESC. It's not like it was all tangled up so I think maybe some other issue. Oh it, Break it, Fix it.

[edrone_]

Really cool feature and presentation was great 🤟

[Gibson]

JB can you bring back your old series about learning to fly FPV in Freerider? My dad could really use it

[Ryet]

03:51
# get osd_esc_rpm_alarm
osd_esc_rpm_alarm = -1
Allowed range: -1 - 32767
so one would guess.... I've set it 999 RPM below my lowest motor idle value... Cheers for the Tip Yancy/JB

Edit: now set to 60...if it's not spinning once a second.. sounds like a decent setting..at least for turtle 🧠
Edit: can't get this to RELIABLY trigger at any RPM unless above idle value... I don't want wont trust this at all...but better than nothing.. even if not reliable? 🤔

[ESForgecraft]

Would be amazing if it could detect the stuck motor and disable just that motor until you flip a switch back so the other motors can still help you get unstuck

[dcdk]

What a nice option 4 our goggles - I just love this channel

[iDontHaveVideos]

JB not knowing it all? We've been lied to, tricked and bamboozled this whole time!


Really though, this is an amazing feature for when the inevitable happens in a tree. Thanks for covering this!

[alchemicalanarchist]

1000 is probably the RPM speed. At Idle you were just over 1000 and if its blocked it would be lower.

[ryandickson]

Wish i would have seen this yesterday. Battery strap came loose and started hitting the prop. Fell out of the sky and immediately noticed a few of the copper wire poles in the motor had melted together. Motor barely rotates now.

[MCsCreations]

Oh, it could help a lot! Thanks, Joshua!!! 😃
The 1000 would be the signal I believe... 1000 to 2000, in which 1000 would be zero RPM? I don't know.
Anyway, stay safe there with your family! 🖖😊

[shadofpv]

Sounds crazy but i've never burnt a motor or fet from a tree branch, normally i manage to cut through the foliage with my props before they explode 😂 or im lucky and it falls out from all the jiggling 🤣 nice video mate 👌🛸🛸

[marlin-fpv]

AM32 has the stuck motor protection feature. Not sure if Blheli32 has that as well already.

[spls]

I'm surprised that trying to turtle while stuck is the most common. I've never burned a motor due to it being stuck, and I've definitely pushed my luck there tons of times. I've only ever burned out motors while flying with a catastrophically damaged prop that creates overly excessive vibrations.

[infiniteefpv]

What about the stuck rotor detection feature in Blheli?

[flyhigh]

How to turn this off? On my SpeedyBee F405v3, telemetry on ESC does not want to work, but now I keep getting the "ERROR" message in the warnings. 😪 after I set osd_esc_rpm_alarm = 1000 😁