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Mavic Air 2 Remote Control + DJI Goggles with minimal latency
731 12 1-16 00:49
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DIY_Quad
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United States
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It's rather sad that DJI did not provide us with goggles to use with MA2.
There have been several attempts to use DJI goggles (or any goggles with a HDMI input) with MA2.
Some uses a WiFi HDMI dongle (aka Miracast) and some uses a tablet with a HDMI output.
I looked at all those solutions and found they all had some serious latency issues.
All tablets with HDMI output lacked processing power to keep up with live video feed through their HDMI ports that people reported latency of more than 1 second.
NVIDIA Shield K1 tablet with a HDMI output would have been a great choice, but unfortunately its processor is only 32-bit and the Fly app unlike the GO app is only written in 64-bit.
The WiFi HDMI dongle solution although snappier, still has overall latency of >0.5 second.
I ruled out the smart controller option (easiest but most expensive) because that controller alone costs almost as much as MA2 itself... I just couldn't justify getting one.


So, here is my attempt at solving this problem.
To run the Fly app, it needs a 64-bit ARM CPU running 64-bit Android 6 or above.
For fast processing, I decided to go with modest CPU cores such as Cortex-A72.
There are several SBCs out there for around $100 that fit that bill.
My choice was Rock Pi 4C equipped with RK3399 processor and dual display output (any two of HDMI, DP or MIPI at the same time).
It can run 64-bit Android 10 in tablet mode.
I picked up a 7" touch screen LCD ($35) to control it like it was a tablet while feeding the same live video to DJI goggles (picked up a pair from eBay for ~$130).
This rig consumes quite a bit of power of around 10W while running the Fly app.
And so I added a portable battery bank with 10Ah capacity ($12).
After putting it all together with some 3D printed parts, it's not the best looking rig you've ever seen, but hey, it works!
Latency wise, it is no different from using your flagship smartphone.
Also, unlike the WiFi HDMI dongle solution, there is no WiFi interference that can seriously reduce your Ocusync range.
Here are some pictures.
















Rig1.jpg
Rig2.jpg
Rig3.jpg
Rig4.jpg
Rig5.jpg
1-16 00:49
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DAFlys
Captain
Flight distance : 1232411 ft
United Kingdom
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Got anymore details about the screen?
1-16 01:14
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DIY_Quad
lvl.4
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DAFlys Posted at 1-16 01:14
Got anymore details about the screen?

yup, it's this one from Amazon.
https://www.amazon.com/gp/produc ... 0?ie=UTF8&psc=1
It's out of stock atm.
1-16 01:18
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DAFlys
Captain
Flight distance : 1232411 ft
United Kingdom
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DIY_Quad Posted at 1-16 01:18
yup, it's this one from Amazon.
https://www.amazon.com/gp/product/B087G97Y6G/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
It's out of stock atm.

thanks,  they seems a good deal at $35.
1-16 01:27
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DowntownRDB
Captain
Flight distance : 525 ft
United States
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Very innovative!  
1-16 05:48
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DIY_Quad
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Thanks Captain!
1-16 15:16
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DowntownRDB
Captain
Flight distance : 525 ft
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You're very welcome.
1-17 04:38
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DIY_Quad
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United States
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The latest Fly app has this new attitude view feature.
Unfortunately, it is only half working on my rig because the SBC does not have onboard GPS and compass to know remote controller location and direction it's pointing at.Still let's me fly with great viewing experience.
But it would be better if I could add a local compass to the rig.
I currently have zero knowledge on how to add GPS and compass to a SBC running android, but I would like to think this is doable.
There is always something to learn....
1-18 00:47
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bprice876.email
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DIY_Quad Posted at 1-18 00:47
The latest Fly app has this new attitude view feature.
Unfortunately, it is only half working on my rig because the SBC does not have onboard GPS and compass to know remote controller location and direction it's pointing at.Still let's me fly with great viewing experience.
But it would be better if I could add a local compass to the rig.

Good evening to you.  I am in awe of your ingenuity of setting that up!  You rock!
Feel like setting mine up for a fee?
2-28 16:30
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DIY_Quad
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bprice876.email Posted at 2-28 16:30
Good evening to you.  I am in awe of your ingenuity of setting that up!  You rock!
Feel like setting mine up for a fee?

Hey, thanks for your comment!
Unfortunately it's not going to be cheap if I were to build one for you.
Not because I want to make any large sum of money from it, but I would have to set aside quite a bit of time to build one.
But I wouldn't mind helping you or anyone interested in this forum build their own every step of the way.
Cheers!
2-28 18:40
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DIY_Quad
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Been receiving PMs from few interested people.
For those interested, let me list few additional items you need to get started.

Active miniDP to HDMI adapter such as this one;
https://www.amazon.com/gp/produc ... 5_s00?ie=UTF8&psc=1
There are cheaper passive adapters out there that relies on video source to do video format conversion.
The SBC I got does not have that capability and so it requires the adapter to do the conversion.
For that, you need an 'active' miniDP to HDMI converter.
I have tried 2 different active adapters and am listing one that worked.

USB type-C OTG cable.
This one is needed to connect the remote controller to the SBC's OTG port.
The remote controller is the master USB device and the SBC is the slave.
I'm sure you could buy one, but I've decided to build my own cable using USB cable pieces lying around and bit of googling.

As for the SBC, I got a dedicated heatsink as well as a 16GB eMMC module.
You can get a combo deal from aliexpress such this this one;
https://www.aliexpress.com/item/ ... .0.0.267c5269nBDn22
You could get away with smaller generic heatsink and a fan, but I didn't like the fan noise.
It's possible to boot Android from an SD card, but an eMMC module make it much faster, and so recommended.

As for the display, the one I got from Amazon is out of stock.
It may not be back any time soon.
The cheapest I found on Amazon right now is;
https://www.amazon.com/Padarsey- ... 15181757amp;sr=8-25
Or if you don't mind waiting few weeks for shipping;
https://www.aliexpress.com/item/ ... b_test=searchweb0_0

The portable battery bank I got is this one from Amazon;
https://www.amazon.com/gp/produc ... 1_s00?ie=UTF8&psc=1

Hope this helps.
Let me know if you need further assistance.
Cheers!





3-7 22:37
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hsgreer
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Thanks for sharing.  It looks like a great solution using goggles.  Can you share your STL files?  
3-18 16:26
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DIY_Quad
lvl.4
United States
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hsgreer Posted at 3-18 16:26
Thanks for sharing.  It looks like a great solution using goggles.  Can you share your STL files?

Sure, please find attached.
These are printed in ABS without any support and then put together using acetone.
The large LCD faceplate is the only thing printed in PLA to prevent wapring and cracking during print.
The faceplate is not showin the orignal post.
I added it later.




MA2_SBC_mount.zip

199.85 KB, Down times: 7

MA2 SBC mount

3-18 23:39
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