A C++ executable that makes Switch 2 controllers into working PC controllers.

• ViGEmBus drivers

• Download the exe in the source code and open it, or optionally build the source code and open the created exe file
• Pick your amount of players
• Pick everyone's controller
• If using a singular joycon you'll be asked if its Left or Right
• If using dual joycons itll ask you to pair one joycon then the other
• When its all done, you'll have SDL controllers ready for every player to use.

Note: Bit layouts differ slightly between left and right Joy-Cons, so correct side pairing is important.

If you want to build the project yourself, follow these instructions (Windows + Visual Studio):

Requirements

Make sure the following are installed via Visual Studio Installer:

Visual Studio 2022 or newer (you'll probably be developing in this anyway)

Workload: Desktop development with C++

Component: Windows 10 or 11 SDK

Component: MSVC v14.x

(Optional but useful) C++/WinRT

1. Open a command prompt or PowerShell in the project root folder.

2. Create and enter a build directory:

   mkdir build
   cd build
   

3. Generate Visual Studio project files with CMake:

   cmake .. -G "Visual Studio 17 2022" -A x64

4. Build the project in Release mode:

   cmake --build . --config Release

5. The compiled executable will be located in:

   build\Release\testapp.exe
   

This document outlines some findings related to Joy-Con 2 BLE input behavior. If you're developing or reverse-engineering Joy-Con 2, Pro Controller 2, or other supported Nintendo controllers over BLE, this may be useful.

A notable quirk of these controllers is that if you attempt to connect or pair them repeatedly in a short time span, they may stop responding or fail to connect entirely for several minutes. This appears to be a controller-level cooldown behavior rather than an OS/BLE stack issue.

If your controller stops connecting:
Wait a few minutes before trying again. It should recover on its own.

Here’s an example notification received from a Joy-Con 2 via BLE, with the IMU command sent. (Pro Controller 2 and GC Controller notifications follow similar layouts but may shift certain fields.)

08670000000000e0ff0ffff77f23287a0000000000000000000000000000005f0e007907000000000001ce7b52010500beffb501ee0ffeff04000200000000

huge thanks to @german77 for providing me with the notification layout below!!

• Left Joy-Con does not use Right Stick, so data at 0x0B–0x0D is typically junk.
• Stick values use 12-bit X/Y packed across 3 bytes:
  • X = upper 12 bits of first 1.5 bytes
  • Y = lower 12 bits of next 1.5 bytes
• Accel/Gyro fields are signed 16-bit:
  • Accelerometer: 4096 = 1G
  • Gyroscope: 48000 = 360°/s
• Temperature:
  25°C + (raw / 127)
  → 25 + (3679 / 127) ≈ 54°C
• Battery voltage:
  Reported as millivolts. 3000 = 3.0V. If 0x0000, likely unavailable at that time.