Breakout - General Purpose USB to GPIO+SPI+I2C

FT232H - Adafruit

This chip from FTDI is similar to their USB to serial converter chips but adds a ''multi-protocol synchronous serial engine'' which allows it to speak many common protocols like SPI, I2C, serial UART, JTAG, and more! There''s even a handful of digital GPIO pins that you can read and write to do things like flash LEDs, read switches or buttons, and more. The FT232H breakout is like adding a little swiss army knife for serial protocols to your computer!