I designed some PCBs to use with ESP8266 devices, which I use as the brains of my fermentation controller.
I’ve been using a Raspberry Pi to control my brewery for awhile. I was growing tired of trying to arrange components and solder wires on prototyping boards every time I wanted to make a system change. Messy and not that fun. PCB design on the other hand could be perfected on a computer, and ordered/printed for cheap. They are also easy to share with others.