Months ago, the household Keurig coffee maker stopped working. While I was able to fix it, the insides looked somewhat nasty after years of use, so I decided to retire the unit. Retired for coffee use or not, it still had a working pump, buttons, and lights, so I decided to turn it into a Raspberry Pi Zero W plant watering machine.
The process is outlined in the video below, and the build itself was done for a series of Arrow.com articles. The first article is found here, which gets into the details if you want to build one yourself!