Multiple Boards for Pit - PC Hardware and Related Software - ED Forums
ControlR Interface – Sim Racing Hardware
SteganoScan
BBI-32 Button Box Interface - With Connectors [BBI-32] - 33.50GBP : Leo Bodnar, Simulator Electronics
BBI-32 How to Use Connecting Push Buttons Connecting Rotary | Manualzz
USB Interface Cards
Budget Adaptive by ThatGuyBud — iOS and Android 2 Button USB Switch Box AND Interface
looking to build a diy joystick/ button box - SparkFun Electronics
Leo_Bodnar on Twitter: "Connect 64 buttons, switches or 32 rotary encoders to your PC with our NEW button box interface BBI-64. USB and go! https://t.co/WGsj5s2UjQ https://t.co/CvTZe63thb" / Twitter
PS4 and XBOX One Button Boxes
DIY Buttonbox
ControlR Bottom Box (add-on) – Sim Racing Hardware