After you finish mapping, it is crucial to save your settings. Click . This writes the configuration to the Arduino's EEPROM memory. Once saved, unplug and reconnect your device. Windows should now recognize it as a standard USB game controller.
There are two common methods to upload the firmware:
Detailed setup instructions, including joystick configuration and matrix button layouts, are available on the Russian MMJoy Project site "Solid Report" on Features & Usage
: The most reliable, virus-free place to download the latest updated packages is via community-maintained GitHub mirrors. Search for trusted repositories archiving megaMOZG13's work. mmjoy2 download updated
This comprehensive guide covers everything you need to know: where to find the latest MMJoy2 download, step-by-step installation instructions, configuration tips, and solutions to common issues.
: These long-running community threads are where users post specific fixes (like the button assignment fix) and wiring diagrams. Feature Idea: "Dynamic Axis-to-Button Splitting"
Developed by "Mega_Mozg13," MMJoy2 is a free firmware designed to turn prototype microcontroller boards (such as Arduino or Teensy) into a professional-grade USB Human Interface Device (HID) without requiring any complex coding skills. In simple terms, it allows you to take a cheap $5 board and transform it into a fully functional game controller that Windows or any simulator will recognize instantly. After you finish mapping, it is crucial to
is a highly versatile, open-source firmware and configuration software designed to transform cheap Arduino boards into professional-grade DIY USB joystick controllers. While it hasn't seen a major official update since approximately 2016-2018, it remains a gold standard for flight sim enthusiasts building custom HOTAS, button boxes, or rudder pedals. Key Features & Capabilities
You can obtain the directly via the official community mirrors on GitHub. MMJoy2 is a powerful, free hardware-independent firmware that transforms cheap, accessible microcontrollers into professional-grade plug-and-play USB Human Interface Devices (HID) without requiring any traditional programming knowledge. It remains a premier choice for flight simulator pilots, sim racers, and DIY hardware enthusiasts looking to build bespoke button boxes, flight sticks, rudder pedals, or throttles. 🛠️ Supported Hardware and Controllers
Later firmware versions introduced mouse and keyboard emulation, support for WS2812 LED strips, MAX7219 7-segment displays, and enhanced debounce filtering for clean button inputs. Once saved, unplug and reconnect your device
For new projects seeking modern features and support, switching to is highly recommended. However, for revitalizing an old Saitek throttle or building a simple button box on a budget, MMJoy2 is still the best tool for the job.
: Features include axis calibration, dead zones, response curves (zoom), and advanced button logic like encoders, toggle switches, and "shift" states.
Once flashed, switch to the and Button Matrix tabs within the GUI to customize your hardware.