Introducing the AUAV X2.1 Flight Controller


The AUAV X2.1 is all about lessons learned. The X2 was a very successful board but there was still room for improvement. Following the PixRacer project we had time to invest into making the X2 the high quality PixHawk replacement we intended it to be. Major changes include: updated IMU sensors, power supply has been redesigned, headers have been laid out more logically, remote USB connector, industry standard 30.5mm mounting points.

Questions and comments are welcome!

Phil and Nick

Available: October 1, 2016

Price: $130


Main: STM32F427VIT6 ARM microcontroller - Revision 3
IO: STM32F100C8T6 ARM microcontroller

Next Generation Sensors:

Invensense MPU9250 9DOF
Invensense ICM-20608 6DOF
MEAS MS5611 barometer

New Power OR-ing schematic with reverse voltage protection. 5V power module is required!


2.54mm headers:
RC input
PPM input
Spektrum input
RSSI input
sBus input
sBus output
Power input
Buzzer output
LED output
8 x Servo outputs
6 x Aux outputs
USART7 (Console)

JST GH connectors:
USART2 with flow control (Telem 1)
USART3 with flow control (Telem 2)
USB (150mm GH to Micro USB cable included for convenient mounting)
JTAG FMU Processor
JTAG IO Processor

Size: 36mm x 50mm

Mounting Points: 30.5mm x 30.5mm 3.2mm diameter

Weight: 10.9g





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  • Developer

    Dario Salas, 

    We are using the same as PixHawk1 (micro F100):

    PX4 Autopilot Software. Contribute to PX4/Firmware development by creating an account on GitHub.
  • Developer


    As PixHawk1, PixRacer and other autopilots they don't provide power on the servo rails. Is not recommended due to variations in power requirements among all platforms. UBEC or power coming from the ESC is recommended to power your servos or actuators. 

    Dario Salas, I will get back to you on that one. 

  • Are the servo pins powered on this board, so we can attach the servo leads directly to the X2.1 or like Pixracer we have to use a UBEC to power the servos?

  • Developer

    @Marc thanks for the help! 

    IMPORTANT: The pin out above has changed slightly. On X2.1 Rev 2 we remove Telem2 JST-GH connector on the side and replaced it with the GPS port, so is more convenient. So the serial ports have been rearranged. We will release a visual datasheet shortly. 

  • COOllll, keep Us update with test and experiences; in wishlist for next build ;) looks nice choice for little space builds.

  • Ok thank you Mark. Yes should be good, especially for difference between platform ...

  • The X2.1 has a lot more I/O options. It is pin compatible with a Pixhawk 1. For example Pixracer has only 6PWM outputs. It is for more 'serious' DIY applications.

    Maybe Jordi can start a brand new thread with a better breakdown and comparison.

  • 3702395903?profile=originalQuick comparison but I don't see a ton of differences. AUAV X2.1 is px4 stack ?

    Sorry want to lear more about it

  • Developer
    Are different platform *
  • Developer
    @kiki boy

    Pixracer and x2.1 and different platforms. Pixracer doesn't have the IO chip and therefore way less inputs and output pins.
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