protocol for JJRC H31?

Schamane
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24 Dec 2016 08:11 #57189 by Schamane

protocol for JJRC H31? was created by Schamane

Hello,
I would Just like to know if there is a protocol for the the JJRC H31. I didn't find it in the supported models list, although i thought that this was quite a popular model. Or maybe there were attempts to deviate it that failed for some reason.
Does anyone have any further information on the subject?
Thanks in advance

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Quadman
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13 Jan 2017 12:36 - 13 Jan 2017 12:37 #57883 by Quadman

Replied by Quadman on topic protocol for JJRC H31?

Hi Schamane completely understand where you are coming from with this one well at least I think I do. Fantastic quad for the money highly manoeuvrable but that crazy yaw spin in high rates

I have a Devo 7E with 3 in 1 module and checked every protocol over the Christmas period in an effort to hopefully succeed with a manual bind, no joy unfortunately so for the time being looks like its a no go. I have some time on my hands at present so I may have another bash as some of the protocols can be tweaked manually and I recently had some success with another quad so watch this space.

Last edit: 13 Jan 2017 12:37 by Quadman.

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HappyHarry
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13 Jan 2017 16:21 #57898 by HappyHarry

Replied by HappyHarry on topic protocol for JJRC H31?

why doesn't one of you make some captures of the protocol for one of the devs to look at and help get it into deviation? seby has a great howto video showing the process for making captures if you don't know how

and a protocol analyzer can be bought for £5/$6 with free shipping from ebay >> www.ebay.co.uk/itm/271716215743

unless one of the devs decides to buy an h31 for themself it will take someone doing the captures, or sending an h31 transmitter to a willing dev to get the protocol hacked and into deviation

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Schamane
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13 Jan 2017 19:09 #57906 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

Thank you for your replies,
it is a great quad i think, maybe i just grew attached to it because i was modding it a bit and surprisingly was succesful with it:)
i was already planning on doing a capture, the analyzer is on my desk already but time is short at the moment. just thought maybe someone else already attempted to deviate it. all i can say from my atenna mods is that it uses tje nrf module.
anyway it is a pleasure to hear from you guys. thanks for that.

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goebish
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15 Jan 2017 13:23 #57972 by goebish

Replied by goebish on topic protocol for JJRC H31?

Fact: each new JJRC machine is using a new protocol, please provide some SPI dumps

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Schamane
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30 Jan 2017 16:34 #58559 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

Hello again,
i finally managed to capture the h31 tx. I hope the files are ok so far, at least they looked alright to my eyes.
You can download a 7zip file from this link: dl.dropboxusercontent.com/u/12275148/capture%20h31.7z
So please terll me if something is wrong or missing.

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goebish
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30 Jan 2017 16:39 #58560 by goebish

Replied by goebish on topic protocol for JJRC H31?

Doesn't look good.
Which chip is it ?
Also, start to capture before switching the transmitter on.

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Schamane
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30 Jan 2017 18:23 #58563 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

The chip is NST LT8910 www.nst-ic.com/f/1/1311114648.pdf
With doesn't look good you mean there is something wrong with the capture or that it can't be deviated?
I used a trigger on the clock to start the capture, so i guess the capture started with the transmitter.

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goebish
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30 Jan 2017 18:25 #58564 by goebish

Replied by goebish on topic protocol for JJRC H31?

The capture is weird, but perhaps that's because there are several devices on the SPI bus.
Anyway, if it's using a LT8910 it can't be deviated for now.

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Quadman
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30 Jan 2017 18:30 #58565 by Quadman

Replied by Quadman on topic protocol for JJRC H31?

That's a real shame. It would seem JJRC are definitely not deviation friendly peeps!

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Schamane
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30 Jan 2017 18:44 #58566 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

Just checked the quad, theres a lt5910 chip on board. But seems to be the same as the lt8910 in a different package. At least now i know why it is not deviated yet. Thank you.

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goebish
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30 Jan 2017 18:45 - 30 Jan 2017 18:45 #58567 by goebish

Replied by goebish on topic protocol for JJRC H31?

The LT5910 has MCU+RF in the same package, while the LT8910 is a RF chip only.

Last edit: 30 Jan 2017 18:45 by goebish.

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Schamane
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30 Jan 2017 18:49 #58569 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

alright, that makes sense.

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tmuehlha
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03 Mar 2017 12:47 #59801 by tmuehlha

Replied by tmuehlha on topic protocol for JJRC H31?

Too Bad, I Just received a H31 anderen was looking vor the deviation protocol ....
Copter is good, transmitter OK for the price.
I have got an unused cheap logic analyser, I can try to capture data if needed.
But whith LT8910 .....

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StevePropHead
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19 Mar 2017 02:08 #60352 by StevePropHead

Replied by StevePropHead on topic protocol for JJRC H31?

Guys, the JJR/C H31 is a REALLY nice flyer, especially for the money. Bought mine for $25, has a lot of power, is fast and responsive, yet smooth and controllable. The stock Tx actually isn't bad at all, but 1) I don't want to lug around more than just my Deviated Devo10, and 2) I know the H31 will fly so much the better yet with my Devo10.

So how can we get it connected? What's the process? Can I contribute (I'm willing, I'm interested, but I have no idea where to start)!

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Shon
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16 May 2017 10:10 #62347 by Shon

Replied by Shon on topic protocol for JJRC H31?

Did someone already check JJRC H31 with protocol analyzer.? I need to bind it with iRangeX IRX4 4 in 1 Tx Module. I have also the newest OpenTX firmware on Turnigy 9XR so I can choose which protocol I need.

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goebish
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16 May 2017 12:53 - 16 May 2017 14:22 #62354 by goebish

Replied by goebish on topic protocol for JJRC H31?

It's using a LT8910 RF IC, it can't be emulated with the nrf24l01, except if we're lucky and this protocol uses 1Mbps bitrate and NRZ encoding maybe, but Schamane has removed his dump from Dropbox, so I can't check that anymore.

Last edit: 16 May 2017 14:22 by goebish.

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Schamane
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18 May 2017 07:19 #62397 by Schamane

Replied by Schamane on topic protocol for JJRC H31?

Hello,
the link must have expired. This is it.

www.dropbox.com/s/ufw1p6vnq4nzu9x/capture%20h31.7z?dl=0

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goebish
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18 May 2017 09:14 - 18 May 2017 10:44 #62399 by goebish

Replied by goebish on topic protocol for JJRC H31?

Thanks, I'll take a look at that, as I said, if it's using 1Mbps or 250kbps bitrate, NRZ line coding and no FEC (we would be lucky!) then maybe it can be emulated.

Last edit: 18 May 2017 10:44 by goebish.

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goebish
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18 May 2017 10:38 #62400 by goebish

Replied by goebish on topic protocol for JJRC H31?

I had a quick look but your captures are missing essential init informations, you should start to capture before switching the transmitter on.

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