At devconf.cz 2020 I presented my DIY project of making an old building "smart". In this talk, you will get a glimpse into the path of a stubborn open-source enthusiast who wants all things open and all sources shown before connecting things to the home network. I will share my experiences and choices made in the last 3 years, the struggle between comfort, openness, and usability. We will cover hardware and software solutions from sensors through MCUs, cameras, and radios up to the heavy lifters for automation and image processing.