Paddles for classic video games

I made some Atari 2600 style USB game paddles for use with Atari emulators and Pong. They're mostly 3D printed with a little bit of electronics (STM32F103CxT6 board, two switches and two potentiometers) and emulate the Stelladaptor's paddle mode (you can also use them as a two-button mouse, with each paddle controlling one axis).  Build instructions are here.