Build Your Own USB HID Joystick Device and Game Controller - DZone
Amazon.com: GameSir T4 Mini Gaming Controller for Windows PC/ Android/iPhone/iPad/ Switch , PC Game Controller with Dual-Vibration, USB Bluetooth Gamepad Joystick for Apple Arcade MFi Games, HID-Support Games : Video Games
Control Interfaces :: U-HID :: U-HID
Developing Arduino code for HID Joystick « Circuits@Home