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.
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
– 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
If current >140A. STOSD display 140A
Blue LED blinks: STOSD is initializing
Blue LED light: STOSD is working.
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
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
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
Voltage precision: +/- 0.4%, Voltage resolution: 0.01V
Current precision: +/- 1.5%, Current resolution: 0.1A
User Manual, Click here.
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.
Connecting the ESC is like on any other PDB. You can use the big VCC and Ground pads to connect your ESC.
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.
Now you just have to wire it up to your flight controller and you’re ready to go!