USB is both the simplest and most complex interface to use. It is simple to plug in and let the computer handle. It is complex to create and run a microcontroller with it. -- Links -- My Website: Buy me a coffee: Bitcoin Address: bc1qwlfr2ml9km4r5vhpfh7f3m60k80whhcq3ysths Ethereum Address: 0x7e8B8Ff8D6bD8DfB48b4A139694BB343f040Bb3f Schematic: Code: ASF-USB: LUFA: USB Datasheet: ATmega16u2 Datasheet: Adapter: --