AOS 5 EVO HD w/ DJI O3

By wrong17 on Sep 13, 2023

2  0  0

This is an updated version of the AOS 5 O3 that I build late last year. Instead of the custom 3D printed camera mount this new frame has a built-in vibration dampener for the O3 camera. I also switched from a 2505 size motors to 2207, and there should be a noticable stator volume difference. I am curouse to see how these 2 very different motors perform.

OSD Problems Betaflight 4.4.X

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Initially, I was planning to do a simple frame and motor swap, but I ran into an issue that I could not figure out. I ended up switching out the FC because I thought it was the UART that went bad. But I kind of knew it was not, I will go more into details later. So, the issue I was having was that the Betaflight OSD was not showing up through my DJI Goggles 2. I updated the firmware on the DJI O3 air unit and goggles. Then I reset all the settings on the air unit. Still, I could not get the OSD to show up. I did all the typical MSP switch and VTX (MSP + Displayport) in the ports tab with the correct UART. I also have the RX and TX soldered on correctly on the FC because it was working perfectly before. Then I switched the different OSD layouts and still nothing. I was getting annoyed and did not want to trouble shoot the problem anymore, so that is why I switched out the FC. Guess what, the new FC did not fix my problem, I still do not have OSD.

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How I knew the problem was NOT the FC is because it was communicating with the air unit. The wiring is correct because it was working before, and how I knew it was communicating is because when I arm the quad, it was getting out of Low Power mode and Starts Recording. So, this would mean that something is wrong in Betaflight. To fix this problem I ended up using the OSD preset and BOOM, problem solved. It looks like there is a bug in BF4.4.x where it does not set the MSP displayport correctly, even if you selected the correct drop-down option. This is just speculation and I do not know the real cause of this problem.

This is the actual CLI commands needed for FC on UART 6

set osd_displayport_device = MSP
set vcd_video_system = HD
serial 5 131073 115200 57600 0 115200       

Starting Tune and Rates

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In the past the "SupaflyFPV Freestyle 5inch" preset on Betaflight has worked very well, so I will use it as my tune again. Make sure you pick the correction options for your setup, in my case I picked the "6s Lipo no HD Camera (1750 - 1950kv Motors)" and "RPM filtering - Unchecking for Dynamic Notch Filter Setup."

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As for the rates, I like the "Joshua Bardwell rates" on Betaflight.

Preset Tune

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Here is a quick screen shot of the PID Tune if you use the Betaflight Preset that I mentioned above.

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This is the JB rates.

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Finially here are the filter settings.

Videos

Maiden flight - DJI HD with EIS OFF

Same Maiden flight as above but recorded with the DJI goggles 2

Photos

Part List

Frame

AOS 5 EVO v1.2
Cncdrones.com
$69.00

Flight Controller

MY CART
Foxeer.com
$39.00

ESCs

Foxeer Reaper F4 Mini 128K 45A BLHeli_32 4-In-1 ESC
Defiancerc.com
$59.90

Motors

4 x XING2 2207 2-6S FPV Motor (3 builds)
Shop.iflight.com
$87.96

Propellers

HQ Prop R38 HeadsUp Racing 5.1x3.8x3 Tri-Blade 5" Prop 4 Pack - Choose Your Color (2 builds)
Racedayquads.com
$3.39

FPV Camera

DJI O3 Air Unit (71 builds)
Pyrodrone.com
$228.99

Receiver

TBS Crossfire Nano Rx Special Edition FPV Long Range Drone Receiver (159 builds)
Pyrodrone.com
$29.95

Batteries

CNHL Black Series 22.2V 6S 1100mAh 100C LiPo Battery - XT60 (16 builds)
Racedayquads.com
$26.99

Hardware

NewBeeDrone DJI O3 AirUnit 20x20 adapter mount (4 builds)
Newbeedrone.com
$6.99

Hardware

RUSHFPV Blade Power Filter Board Lite
Racedayquads.com
$4.59
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