https://gutsymaker.com/A personal notebook of DIY electronics and smart-home projects, with hands-on build notes, practical decisions, and progress from idea to prototype.enhttps://gutsymaker.com/journal/first-prototype-boards/https://gutsymaker.com/journal/first-prototype-boards/Why I chose a DIY reverse-osmosis water purifier, the controller I use now, and my plans for a smarter board with Home Assistant integration.Sat, 17 Oct 2026 07:19:10 GMT