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Matek HubOSD wiring & review


The Matek HubOSD a very easy to use power distribution board.
The PDB comes with a build in OSD running STOSD and is sold by Banggood and manufactured by Realacc/Matek.

STOSD is easy to set up using the STOSD8 tool which you can find on the STOSD website.

Check out the quality of the Matek HubOSD in my video of my maiden flight with this board.
DVR footage is included as an overlay on my GoPro footage but at the end there’s a part with raw DVR footage.

[penci_video url=”” align=”center” width=”” /]

In this article I will do a small review about the HubOSD and a tutorial how to solder the wires and flash the firmware.



Brand name: Realacc
Input voltage range (3S-5S operation): 8 – 21VDC
PDB: 4x30A (Max.4x35A)
Regulated 5V and 12V outputs
Current Sensor 140A
Built-in STOSD8
– 2oz copper, 4-layers &1.6mm PCB.
– 1x Battery input, 4x ESC outputs.  2x BEC 5V outputs, 2x BEC 12V outputs.
– Camera signal & Gnd pads, Video Transmitter Signal & Gnd pads
– 1x Serial port (RX, TX, G)
– Dimensions: 46x36x4mm, Weight: 8.5g
– Mounting holes 30.5mm square spacing

PDB (ESC outputs)
Continuous current: 30A per output
Peak current (10 seconds/minute): 35A per output

BEC 5V outputs
Designed for RC Receivers, Flight controllers, OSD, and Servos.
DC/DC synchronous buck regulator.
Voltage: 5.0 +/- 0.1VDC
Continuous current: 2 Amps (Max.2.5A 10s/minute)
Output Ripple: 40mV (VIn=16V, VOut=5V@2A load)
Short-circuit tolerant (5 seconds/minute)

BEC 12V outputs
Linear regulator, very low noise. LC Filter is needless.
Designed for Video TX or FPV camera.
Voltage: 12.0 +/- 0.3VDC (4~5S operation)
Continuous current: 500mA@16V IN,  400mA@20V IN
Short-circuit tolerant (2 seconds/minute)
If the battery is 3S LiPo,  Output voltage=3S LiPo voltage – 1V

Current Sensor
If current >140A. STOSD display 140A


Running indicator
Blue LED blinks: STOSD is initializing
Blue LED light: STOSD is working.

Autodetect PAL/NTSC
Auto sense PAL / NTSC cam at OSD startup. Default is NTSC without Cam signal

Dynamic on screen info
Current < 2A & keep 5 seconds Current > 2A

Matek HubOSD manual image Matek HubOSD manual image

Min.Volt & Max.Amp recorder

Automatic flight timer
Current > 2A, Time in.  Current < 2A,Time out..

Auto battery cells detection
If the Input voltage is in the range of following, The HUBOSD will detect the cell
numbers automatically.
11.1~13.05V: 3cells LiPo,  14.8~17.4V: 4cells LiPo,  18.5~21V: 5cells LiPo
If the input voltage is out of the range. The voltage value will blink on screen.
Please check if the battery total voltage is below 3.7V*cells

Low vlotage alarm
(Value blinks): Default 3.6V* cells

Exceeding mAh alarm
(Value blinks): Default 1000mAh

Onscreen Pilot ID
Default is disable. you can type some words & enable it in GUI

Firmware upgradable
Voltage precision: +/- 0.4%, Voltage resolution: 0.01V
Current precision: +/- 1.5%, Current resolution: 0.1A

User Manual, Click here.

Package Included:
1x HubOSD

Build quality

The build quality of the HubOSD looks very solid and the voltages for the 5v and 12v BEC are as they should be.
I have this board for almost a year now and it’s still running perfectly fine! I’ve had loads of crashes and it’s been soaking wet once due a crash in wet tall grass and after drying my quadcopter it worked perfectly fine again!


Wiring up the HubOSD is pretty straight forward and a detailed instruction guide is found below.

The HubOSD makes it posible to make a very clean build because the OSD is already integrated. This saves you a chip like a MinimOSD with and all its extra wiring.
There is plenty of space on the board so you don’t need very good soldering skills. The pads on the board are also very clear so there’s not much what can go wrong.

Flashing the firmware

Also flashing the firmware is childs play using the STOSD8 tool. You can use a UART of your flight controller and use a bypass CLI command in Betaflight to flash the firmware using your flight controller as a FTDI programmer. Off course you can also flash the firmware with a FTDI adapter like the manual says but using the UART is easier in my opinion because you could leave the small wire connecting to the UART. I will explain how you do this later in this article.


Wiring the Matak HubOSD

Wiring the Matek HubOSD is pretty straight forward.
That’s also the power of this board, easy to use and lightweight.

Depending on your camera you’ll have one or two ground cables.
If your FPV camera only has one ground cable you should connect it to the ground of the OSD which is the ground output next to the CAM input.

Matek HubOSD wire schematic
This is the wire schematic of the Matek HubOSD. If your camera only has 1 ground cable you should connect it to the ground next to the CAM input.

Connecting the ESC is like on any other PDB. You can use the big VCC and Ground pads to connect your ESC.

Matek HubOSD ESC connection
Wiring your ESC to the Matek HubOSD is straight forward using the big VCC and ground pads on the board.

Now it’s time to wire up the camera, flight controller and the VTX.
In the image below you can see my finished result, for a detailed wire scheme see the schematic above.

Matek HubOSD wired close up
This is how my soldered Matek HubOSD looks like with all the equipment attached.

Now you just have to wire it up to your flight controller and you’re ready to go!

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