OpenHD 3” mini quadcopter

By MarioFPV on May 17, 2021

15  1,077  7

Step by step build tutorial + maiden flight.

I decided to keep the plastic cover on the ASUS AC-56 module in order to protect it.
It increases the weight but it keeps the VTX safe as it's outside of the frame.

Diatone Roma L3 Mini quad setup:

Frame: Diatone Roma L3 Quadcopter
Flight controller: Kakute F7 Mini V3
GPS: Matek GPS & Compass Module M8Q-5883
Propellers: Avan Mini 3 Inch Propeller Clear
ESC: Diatone Mamba F35 35A BLheli_S 4in1 ESC (3-6S)
Motors: Emax RS1306B V2 Motor - 4000KV
Receiver: Frsky R9 MX with ExpressLRS telemetry firmware
Firmware: INAV 2.6.1

OpenHD setup:

Air side:
Raspberry PI Zero
Raspberry PI Camera V2.1
Camera module:
Asus AC-56 WiFi USB module
OpenHD 2.0.8

Ground side:
Raspberry PI 3B+
Asus AC-56 WiFi USB module
OpenHD 2.0.8
HDMI video recorder:
Fatshark HDO
Maple Wireless 17dBi patch antenna

DIY Antenna Tracker by zs6buj

Jumper T16
FrSky R9M with ExpressLRS (Telemetry) firmware running at 100Hz/1:16TLM @ 868MHz (with ExpressLRS fan mod)


Part List


Diatone Roma L3 Quadcopter Frame - Unmanned Tech UK FPV Shop (3 builds)
See Site

Flight Controller

Kakute F7 Mini V3 - Unmanned Tech UK FPV Shop (4 builds)
See Site


Diatone Mamba F35 35A BLheli_S 4in1 ESC (3-6S) - Unmanned Tech UK FPV Shop
See Site


4 x Emax RS1306B V2 Motor - Unmanned Tech UK FPV Shop
See Site


Avan Mini 3 Inch Propeller Pack (Pack of 12) (2 builds)
See Site
Show stores (1)


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Joshua_A   May 20, 2021  

It is absolutely amazing what open source projects are capable of... WOW!
Your build a extremely cool!
Do you have link for OpenHD project?

MarioFPV   May 28, 2021 

All the links are in the video description.

Jodie Froster   May 20, 2021  

I made the comment on your receiver binding (youtube) video about the 4v5 pad. It's awesome to see your build here!!!!!!
Thanks so much for documenting this, I just started using ELRS 3 weeks ago (well.. I GOT it 3 weeks ago, i've been using it for 2 weeks, it took me 3 separate sessions to get it up and running properly). Opensource projects like this are new to me, and the details are so critical. I will use your videos to get my own OpenHD setup running, and i'm SUPER excited about it!!!

MarioFPV   May 28, 2021 

Thank you mate! Cheers!

Artifixprime   May 22, 2021  

How did you get the 1306B motors to fit? I have these with the same frame, but the c-clip won't fit in the hole for the motor mount. Did you need to drill it out?

MarioFPV   May 28, 2021 

Yes, you need to drill it out. Have a look at the build video for more details!

MarioFPV   May 28, 2021  

Camera upgrade and comparison! Enjoy and please subscribe!

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