DIY-OpenPuck: Enthusiast Decodes Steam Controller 2 and Enables Cross-Platform Use Without Steam

As Tom’s Hardware reports (https://www.tomshardware.com/peripherals/controllers-gamepads/enthusiast-reverse-engineers-steam-controller-2-puck-creates-diy-openpuck-that-works-without-steam-input-custom-firmware-can-emulate-nintendo-playstation-and-xbox-controllers), a tech enthusiast has successfully reverse-engineered the so-called puck of the Steam Controller 2 and developed an open-source firmware called OpenPuck. This enables the controller to be used without the Steam software and to emulate an Xbox, PlayStation, or Nintendo Switch controller.

What is the Steam Controller 2 Puck?

The puck is the central input device of the Steam Controller 2 that establishes the connection between the controller hardware and the PC. Originally, the controller is heavily tied to the Steam software, which makes usage outside the Steam environment difficult. The new OpenPuck firmware replaces the original control software and turns the puck into a universal gamepad adapter.

OpenPuck: Functionality and Advantages

OpenPuck is based on a microcontroller programmed with the open-source firmware. Within minutes, a DIY puck can be built that works without Steam Input. This means that the Steam Controller 2 is now also recognized as a native gamepad on other platforms and operating systems. The firmware supports emulation of controllers from the major console manufacturers Nintendo, Sony, and Microsoft. This allows users to use their Steam Controller 2 flexibly without relying on the Steam software. It opens new possibilities for use on consoles, PCs without Steam, or even on mobile devices that support USB controllers.

Why is this important?

The binding of many controllers to proprietary software limits user-friendliness and compatibility. With OpenPuck, a piece of hardware freedom is regained, as the Steam Controller 2 now functions as a universal controller. For tinkerers and tech enthusiasts, this is a big step because they can now customize and extend their own firmware. Furthermore, the project shows how proprietary hardware can be made more flexible and open through reverse engineering and open-source development. Especially in the gaming peripherals sector, where exclusive ecosystems often prevail, this is a valuable contribution.

Technical Details and Community Impact

The firmware is open source and available on GitHub, allowing developers to make their own adjustments or integrate new functions. The emulation of the various controllers is done via standardized protocols supported by the consoles. The community benefits from a greater selection of compatible controllers and the possibility to continue using older or less common hardware. Additionally, the project promotes understanding of controller hardware and their interfaces.

Conclusion

OpenPuck is a successful example of how proprietary devices can be decoupled and made more versatile through technical expertise and open-source software. For users of the Steam Controller 2, this means more freedom and flexibility in using their controller—independent of the Steam platform. The project underscores the value of reverse engineering and collaborative development in the hardware scene and could serve as a model for similar initiatives.