There’s a well-known movie trope in which a hacker takes control of the traffic lights in a city, causing general mayhem or ...
Using a single GPIO port on a microcontroller to control N bits of arbitrary parallel binary outputs, e.g., a multi-digital display.
The Inter-Integrated Circuit (I2C) protocol has been the backbone of short-distance, intra-board communication. However, implementing robust I2C communication is not just about connecting two wires.