MMJoy2 does not support "simple" buttons connected directly to GND. You must define at least a matrix or use shift registers.

Download and unzip the MMJoy2 package. Run JoySetup.exe . Flash Firmware:

Once flashed, your device will appear as "MMJ-Reset." Use the GUI to define your axis pins, button matrix rows/columns, and custom device name.

MMJoy2 transforms an board into a Plug-and-Play (PnP) device recognized by Windows as a standard joystick. Compatible Hardware

Support for up to 6 encoders with adjustable timings.

Ensure you are using a board with the ATmega32U4 chip. Boards like the Arduino Uno (ATmega328P) are not compatible with MMJoy2.

Select the correct (note: this is the bootloader port, which only appears for a few seconds after hitting Reset). Click Upload Firmware .

For those seeking legacy updates or specific older builds (like the v20161101 or v20150727 variants), the original Google Site remains a deep archive. MMJoy Project Downloads