The video below (enable audio!) shows a detailed overview of the new Pixracer flight controller.

It is the 4th generation of the Pixhawk flight controller family (make: FMUv4) and like the first generations designed by the Pixhawk Open Hardware team in collaboration with an international dev team. It supports the PX4 and APM flight stacks. If you like to try PX4 on it, follow the user guide.

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Comment by Edward (Sandy) Abernethy on January 26, 2016 at 6:56pm

Have master fw running well with QGC 2.91, but I was not able to get the 3dr gps to function.. Found out the wires to the df13 6 connector were reverse order: red was in 6, and GND was in 1 and so on.. Once I put wires to the correct pins, gps is now working..

Comment by gervais on January 28, 2016 at 2:51pm

Please wire it as shown below :

Comment by Phillip Kocmoud on January 28, 2016 at 3:22pm

Sorry guys, Nick sent out an email to everyone on 1/19/2016. Seems some people did not get it. Gervais, Thank you for posting this.

Comment by Richard Kennedy on February 6, 2016 at 4:30pm

Does this board support direct connection to Frsky X8R smart port for telemetry without the need for the teasny board? If so does one need to configure that in the parameters? Thx

Comment by gervais on February 7, 2016 at 1:11am

The Pixracer comes with a FrySky Port, no need for a teensy board, but no xperience with that since  I´m using Hott :-(

Comment by Thomas Rotskas on February 7, 2016 at 10:23am

Hi PX4

I bought one of these nice tiny boards.

It came with a bunch of cables, so it was no problem to connect everything.

I only have 2 issues:

1) I Cannot calibrate the compass. After finalizing all steps, I get the following messages:


[cal] right side done, rotate to a different side
[cal] right side done, rotate to a different side
[cal] ERROR: Excessive offset for mag 1
[cal] calibration failed: mag

I also tried it via ArduCopter, and it seems, that the on-board compass has an issue (the external one -from GPS- seems to work). 

Any idea, what's going wrong?

2) With the "Master" branch, the FrSky Telemetry is not working any more (with the stable branch it works perfectly)

Any help is appreciated :-)


Comment by Thomas Rotskas on February 7, 2016 at 9:50pm

Telemetry is now working with the PX4 Flight Stack, but Compass is still an issue, calibrated it for 30 times now with no luck.

In ArduCopter I can disable the internal Compass I guess, but I have no idea which serial port is the FrSky telemetry port (need to switch it to FrSky D-Bus protokol)... will try that later.

Comment by gervais on February 8, 2016 at 3:34am

PixRacer FrSky S.Port

Comment by Thomas Rotskas on February 8, 2016 at 4:02am

Hi gervais,

do you know which port to use in MP for ArduCopter and PixRacer?

Comment by gervais on February 8, 2016 at 4:24am

Depends. Check your hardware manager:

Mine is COM 33, but that depends on your PC. Btw., I´m not sure if its possible to load Arducopter FW with MP already, did not try. It does connect and show PX4Stack values though.


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