An enclosure for custom hardware with mechanically fitting parts, from AutoCAD to 3d printing! Doing this taught me to appreciate the intricacies of bringing an electronic device to production.
A simple circuit that lights up a bar LED display incrementally when a button is pressed.
An LED arrow that lights up incrementally in the direction of the arrow on a timer.
Playing with the Cerebot 32MX7, interfacing with an LED and getting text to display. Later I made the snake game with the LCD that could be controlled via the buttons built-in on the cerebot.
A 4bit ALU made with simple gate chips and very ugly wiring! Almost no space left on that side of the breadboard!