You cannot run MMJoy2 on an Arduino Uno (ATmega328p). It requires an (the "Blue Pill") or an STM32F105 (for more advanced uses).

Let’s perform the process safely and efficiently.

MMJoy2 is a powerful, free firmware and software suite that transforms affordable Arduino boards into high-performance, custom USB HID game controllers. Ideal for flight sim enthusiasts and DIY cockpit builders, it allows you to create everything from simple button boxes to complex HOTAS systems without needing any traditional coding knowledge.

This article provides the definitive guide to downloading, installing, and using MMJoy2 to build your dream controller.

Since the original project site can be difficult to navigate, most users rely on the following mirrors:

Disclaimer: Always scan your downloaded files with Windows Defender. The author is not responsible for bricked microcontrollers due to incorrect wiring. Join the MMJoy2 subreddit or Discord for community support.

Before you click that download link, ensure you have the following:

This is the heart of the user experience. After the and flash, open mmjoy_setup.exe (run as administrator).

This article covers everything you need to know about the , including where to find it, how to install it, and why it remains the gold standard for custom controller firmware in 2024.

The Leonardo is often preferred for larger projects because it has more physical ports than the compact Pro Micro. Core Features