Logitech G27 Compatibility Tool

Play old PC games with sequential shifting with the Logitech G27 with full support for the H-Shifter

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If you own a Logitech G27 racing wheel you know the problem: You have an amazing H-Shifter, but you're just able to play it with games supporting this. Older great racing games that support normal, sequential shifting can't be controlled with the H-Shifter. But these times will be forgotten with this project. Simply install the compatibility tool for Windows and connect an Arduino micro (with USB HID support). The Compatibility Tool will recognize the position of the Shifter and knows if you shifted one gear up or down. The Arduino gets a signal from the Tool and simulates a key press and the gear in-game will shift.

This project will be migrated to my other project: Volkswagen CAN BUS Gaming

The Compatibility Tool is being coded in Delphi / Turbo Pascal and recognizes the position of the shifter. Here a first screenshot of the tool:

A proof of concept video can be found here (meanwhile only in German language):


This is the program referred to in the video. Just download and run it. You have to check your settings before using the software with any game.

octet-stream - 1.45 MB - 04/19/2016 at 11:48


  • 1 × Arduino micro
  • 1 × Windows PC

  • Arduino Code

    Leon Bataille11/25/2015 at 10:29 0 comments

    For all of you who want to rebuild this at home.

    This sketch controls a 7-segment display as a gear indicator and simulates a keypress when corresponding data is being received through the Arduino's serial port.

    The display is able to show: r (reverse), n (neutral), 1, 2, 3, 4, 5, 6

    // Eine 7-Segment Anzeige ansteuern
    // Matthias Busse Version 1.0 vom 30.11.2014
    // 7-Segment a-f und der Punk h
    //  -a-
    // f   b
    //  -g-
    // e   c
    //  -d-   h
    // a > D2
    // b > D3
    // c > D4
    // d > D5
    // e > D6
    // f > D7
    // g > D8
    // h > D9 
    int j=1;
    //            R           N           1          2          3          4          5          6          7          8          9          10        11        12
    //byte z[14]={B00001010, B00101010, B01100000, B11011010, B11110010, B01100110, B10110110, B10111110, B11100000, B11111110, B11110110, B11111101, B01100001, B11011011}; 
    //            R           N           1          2          3          4          5          6
    byte z[8]={B00001010, B00101010, B01100000, B11011010, B11110010, B01100110, B10110110, B10111110};
    void setup() {
      for (int i=2; i <= 9; i++) // 2-9 sind Ausgänge
      // open the serial port:
      // initialize control over the keyboard:
    void loop() {
      // check for incoming serial data:
      if (Serial.available() > 0) {
        // read incoming serial data:
        char inChar =;
        // Type the next ASCII value from what you received:
        if ((inChar == 'p') && (j < 7)) {
        if ((inChar == 'm') && (j > 0)) {
    void segmente(byte n) {
    // alle 7 Segmente ansteuern
      for(int k=2; k <= 9; k++) {
        if((n & B10000000) > 0)
          digitalWrite(k, HIGH);
          digitalWrite(k, LOW);
        n = n << 1;

  • Arduino micro connection works!

    Leon Bataille08/03/2015 at 11:05 0 comments

    With the use of the Arduino Example "KeyboardSerial" it's possible to send a serial command to the Arduino which converts the signal to a virtual Keystroke.

    In this way my Compatibility Tool is able to send a serial byte to the Arduino and this will send the Keystroke to the game you're playing.

    I hope it'll work after editing my Program in Delphi!

  • Compatibility Tool recognizes the actual shifter position

    Leon Bataille08/02/2015 at 07:58 0 comments

    With the use of the DXJoystick Component from Winsoft XE for Delphi I am able to display the gear in the Compatibility Tool which is a good start. The tool also knows when I shift from a lower gear to a higher and should then send a signal to the Arduino micro and this should send an emulated keystroke to the Racing Game or Simulator you're playing with at the moment.

View all 3 project logs

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