I wanted to learn KiCAD, solder some SMD components, and try out an online PCB manufacturing service.
A microcontroller PWM'ing an LED is a common intro project. I figured a blinky cat would be a cute modification.
It turns out: PCBs layout is hard enough without an aesthetic goal. It took a few attempts!
It was immensely satisfying when, after painful layout, painful SMD soldering, and usual code debugging... it blinked!
It does a slow blink. The kind cats supposedly do when they trust you.
KiCAD files, C sources, avrdude scripts, e.t.c. are here.