Regular Hackaday reader [Osgeld] is at it again with this USB conversion for an NES controller. This is a ubiquitous hack that we started seeing very early on, sometimes involving an adapter kit, and other times including things like a thumb drive and USB hub. But this time around is truly a bare-bones version. He’s using an Arduino but it’s really just an AVR ATmega168 running the bootloader. We’d wager this can be done with an ATmega8 just as easily. Grab a couple of diodes (we never seem to have the 3.6v zener diodes around when we need them), a couple caps and resistors, a crystal and you’re in business. The hack wires each button to a pin and implements a keyboard HID that can be mapped for any purpose you desire.