Testing

To quickly check your work, the website Gamepad-Tester.com is an easy way to test USB controllers on any computer with a browser.

After pressing a button the website will detect the controller and start showing button presses.

For compatibility, this project used a full gamepad USB HID descriptor with 14-buttons, d-pad, and two analog sticks. So only the D-pad and 8 buttons programmed will register button presses.

Reassemble

Congratulations! If the button presses are being detected, then you have successfully completed the Super Nintendo controller USB mod.

Lastly, put the shell back together and screw-in the five screws to the back shell.

Play and Tinker

Now you are ready to start gaming on Windows, Mac, or Linux operating systems.

For fun, the code can be easily modified to remap buttons or even to map the d-pad presses to analog stick outputs.