Building and programming a USB auxiliary display using a SparkFun Pro Micro, an HD44780 LCD module, and an PCF8547 IC-to-parallel IC

from blog Kevin Boone's website, | ↗ original
↗ original
Make an "auxiliary LCD display" for a computer that displays data sent to it over a USB connection. Ready-made devices of this sort are widely available, but it's more fun to build your own.