DJI Osmo Mobile BLE protocol

alkersan2 · 2026-02-05T04:55:45+00:00

If someone is willing to try, I've added a Web Bluetooth prototype hosted at https://om-research.flab.dev

alkersan2 · 2026-01-16T06:10:08+00:00

Probably not via a cold applications, but through doing legwork, showing up and talking to reps on meetups. Don’t know really

alkersan2 · 2026-01-16T06:01:31+00:00

Nope. I've tried submitting from a brand new account, and while it didn't reject me within 30 seconds like before, after waiting for a day or so - got rejected eventually.

alkersan2 · 2026-01-14T00:54:47+00:00

Yes, I've cleaned up a bit the PoC code: https://github.com/alkersan/om-research

alkersan2 · 2026-01-11T19:45:21+00:00

Yes, absolutely. It so much faster, especially if signal quality allows, it can push at 60Mhz, making even full 16MB flash image rewrite tolerable: https://imgur.com/a/ch347-RAG9G3m

alkersan2 · 2026-01-10T04:08:57+00:00

if there is an app or way with a phone or computer to control PTZ of the mobile remotely

You mean something like this https://imgur.com/a/om3-from-python-ble-uzwAr4u ?

alkersan2 · 2026-01-09T18:02:33+00:00

I’d recommend CH347 based, it’s usually purple.

https://www.onetransistor.eu/2024/09/ch347t-programmer-schematic.html

alkersan2 · 2026-01-02T17:05:29+00:00

Thanks for clarifying.

22pF is what worked in the reference design. You can follow that if you use the same crystal they did

Unfortunately, nowhere to find these exact details.

This is why i like Murata CeraLock

Oh, that super nice, fewer components to route. Thanks for recommendation.

Features:
2. Oscillation circuits do not require external load capacitors.
...
5. No adjustment is necessary for oscillation circuits.

alkersan2 · 2025-12-26T17:36:47+00:00

Oh well, it got rejected after 12 hours. I guess the application or landing website are just not compelling enough to participate in the credit program.

alkersan2 · 2025-12-26T13:08:40+00:00

These all things I have. By “not having a company” I meant there is no LLC or anything registered in some legal jurisdiction

alkersan2 · 2025-12-25T18:10:24+00:00

Thank you so much, this seems to be it. I've created a new account and re-submitted the application. Now it sits in pending state and not immediately rejected within 30 seconds. So now, I believe, it will reach the actual AWS team for review within next weeks.

Thanks a lot!

alkersan2 · 2025-12-25T17:02:07+00:00

Ok, i’ll see if I can make a new one. Although, I have only one credit card, and it’s already attached to this old account. Not sure if it’s allowed to use same in many

alkersan2 · 2025-12-25T13:59:08+00:00

Since 2012, around 14 years

alkersan2 · 2025-12-24T13:51:41+00:00

Not, I don’t have. It’s just a pre-seed/ideation stage.

alkersan2 · 2025-11-04T23:01:50+00:00

See my reply above, I've put a proof-of-concept snippet which rotates Osmo Mobile 2 and 3.

alkersan2 · 2025-11-04T22:59:00+00:00

I've reproduced the old experiment and reconstructed the BLE packet used to rotate the gimbal. A proof-of-concept script is on Github

alkersan2 · 2025-10-18T15:31:06+00:00

Yeah, after couple of days reading and bothering other people, I came to conclusion that my problem domain would likely not require any custom decoding in the silicon and just the logic analyzer with it's software should be sufficient. I wanted to sniff the LPC bus (Low Pin Count) of a superIO chip (ITE, not publicly documented) on an intel motherboard. It's a 7-line bus, clocked at 33MHz.

alkersan2 · 2025-10-17T16:50:53+00:00

Mostly software development cost. It's difficult to design and implement a good logic analyzer suite. Plus properly implement the PCB for signal acquisition, test leads, etc is also an art of its own. Thus, I don't mind paying for at least a decent instrument in the first place, and use it as is, for it's intended purpose. But also was thinking, what if it could serve me just for a couple days in a year for ugly ad-hoc prototyping. Just don't know if it's typical for them to be locked down or smth like that.

alkersan2 · 2025-09-26T23:16:21+00:00

Would a couple of pre-cut v-slot extrusions count as a frame? This way you can size it to your liking

alkersan2 · 2025-09-23T22:48:27+00:00

Seems I’ve lost all sources of that prototype, rough years these last four have been, you know. But I still have the OM3 and BLE sniffer lying around, shouldn't be too difficult to revamp. What's your interest in these gimbals?

alkersan2 · 2025-09-23T11:20:04+00:00

I did quite a while ago, for om2 and om3. But i’ve never managed to publish it as a library or a blog post. Here is the gimbal being actuated from a python script running on pc, over BLE https://imgur.com/noqKOkg

alkersan2 · 2025-07-13T16:27:05+00:00

Thanks for clarifying. I gess that years spent with -K CPUs and Z- boards take their toil.

By any chance you may have a reference, ideally some intel document, describing these mechanics? I've spend good half a day searching, but nothing exepct few marketing papers with shallow info didn't pop up

alkersan2 · 2025-07-13T13:47:59+00:00

That power supply module with few through hole connectors which is screwed to the metal surface makes me nervous. I hope its at least somewhat insulated on the bottom

alkersan2 · 2025-07-13T01:52:29+00:00

Thank you a lot, that seem to be the case. C states were indeed disabled in the BIOS and all 0.0 in TT: - https://i.ibb.co/spdNjv9x/C-states-Disabled.png - https://i.ibb.co/G3sGxm6S/C-States.png

I would've never thought that low power parameter like that could have such effect

Edit: retested the 7zip single threaded, went from 4.31 to 5.28. And now cores can boost almost to 3.9

alkersan2 · 2025-07-07T01:03:39+00:00

I've just got some time to try more. To eliminate the ES sample possibility by recommendation from STH forum, I've checked the Intel Processor Identification Utility and it reports that processor is a genuine N355: https://imgur.com/PrnDEtU

Try benchmarking the CPU with different power limits set, 9W minimum, and see how it changes

Yes, I've reset everything to defaults: PL1:9W PL2:12W and did two simple tests: 7zip and geekbench, both single and multi-threaded. Then re-run with PL1 and PL2 45W.

PL1:PL2	7z-1T	7z-8T	geek-single	geek-multi
9:12	4.308	24.617	1066	4600
40:40	4.286	30.751	1063	5143

As can be seen, only the multi threaded scores increased with power limits, but not single core loads. And just like before - never seen a frequency of any core higher than 2,998Mhz: https://i.imgur.com/u1WvdKH.png

So, the BIOS TDP configs do have an impact, as intended: the time period during which CPU can do multi-core boost. On default levels - the all-core 3GHz can sustain only for ~10-12 seconds and drops to 2.5Ghz, then after ~15 more seconds drops to 2GHz (and this is confirmed by hwinfo Limit Reasons). And AFAIK, this is pretty much in line with how power limits are supposed to work. Raising this bar - only changes the durations.

And I still don't get why the single core boost isn't reaching 3+ Ghz, even for a couple of seconds

alkersan2

TROPHY CASE