Locking at the controller plug, there is a rounded corner and a flat corner. Wire Up the SNES controller to the arduino. Turn off all tools that might interfere with USB such as USB Overdrive. Here are the steps in detailed order: Hint / Important Selecting this HID Joystick in your emulator allows you to read input from this device. When the newly flashed Arduino is plugged in into the PC, it will register with the operating system as a HID Joystick. This is how a button press makes it from the SNES controller through the MEGA16u2 chip, through USB, through the PC’s USB controller to the emulator. It will fill in the dataForController_t with the SNES controller’s button state. The sketch on the Arduino will poll the SNES controller and it will interpret the signals as button or dpad presses. It will return this information back to the USB controller. The custom UnoJoy firmware that is flashed to the MEGA16u2 will read a dataForController_t data structure from the sketch that runs on the Arduino. That means that the MEGA16u2 chip on the Arduino is constantly polled for input data.

The USB protocol mandates that the USB controller inside your PC polls USB HID devices for input state. burks10 added a sketch that is able to interpret the SNES commands and insert them into the data structures that the UnoJoy project mandates. UnoJoy supports the PS3 controller out of the box but not the SNES controller. The USB firmware is contributed by the UnoJoy project which has it’s repository under. The solution also is able to flash back the original Arduino USB firmware, so you will not permanently alter your Arduino. For that the Arduino’s USB connector chip MEGA16u2 that takes care of the USB protocol on the Arduino is reprogrammed by flashing custom firmware to it. The idea is that an Arduino is used to adapt the SNES controller to a USB HID Joystick device that the PC can use to control an emulator. Inspired by this github repository and the accompanying YouTube video, I want to write down the steps I followed to get a SNES controller working on a PC without bying any SNES adapters or permanently and irreversibly modifying the controller.

Connect a snes usb controller