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Arduino library to interface with the X52 HOTAS through its PS/2 connector

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X52 HOTAS

Arduino library to interface with the X52 HOTAS through its PS/2 connector. Supports both the Pro and non-Pro versions of the hardware.

X52 Pro HOTAS

This work is based on my X52 Pro HOTAS that was purchased new in June 2020. It covers an old X52 (non-Pro) joystick too that I could pick up for pennies because it was sold for parts without the throttle.

Documentation

My Pro throttle isn't compatible with my non-Pro joystick: they have the same PS/2 pinout but speak slightly different protocols. Not too surprising as they were designed and released years apart with different feature sets.

  • X52 Pro:

    • The wire protocol over the PS/2 (6-pin mini-DIN) cable between the X52 Pro throttle and joystick
    • The wire protocol between the two MCUs of the X52 Pro joystick (one in the base and one in the handle)
  • X52 (non-Pro):

    • The wire protocol over the PS/2 (6-pin mini-DIN) cable between the X52 non-Pro throttle and joystick

We don't know how often (if ever) the X52 firmware changed in the past 15+ years. Your X52 may use a slightly different protocol than the one described and implemented here.

Firmware source code for Arduino-compatible boards

USE THIS AT YOUR OWN RISK AND ONLY IF YOU KNOW WHAT YOU ARE DOING. EVERYTHING IN THIS REPO COMES WITHOUT SUPPORT.

This repo can be installed to the Arduino IDE as a library (use google to figure out how). After installation the following examples should appear under the File | Examples | X52 HOTAS menu of the IDE:

Mission Complete

The primary objective of this project was to make it possible to use my X52 Pro joystick without the throttle unit. Below is a photo of a fully functional prototype that needs only cosmetic improvements. Nothing was changed inside the joystick - the USB capability is provided by a small PJRC teensy 3.2 board (or its low cost alternative: the teensy LC) running a customised version of the "Fake X52 Pro Throttle" firmware:

Standalone X52 Pro Joystick

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