Been playing around in Kicad, think I'm going to actually get these boards made, it's gotten so cheap now may as well. Even found a manufacture that makes them in Canada within about a week. Might need to tweak a few things but think it's pretty much ready. Just a basic relay controller that will be controlled by a RPI. In the future I'll make it stand alone where the ethernet cable plugs straight in and it will have it's own MCU, like Atmega or something but that will require a bit more time to figure out the ethernet Phy and TCP/IP stack etc. Project for later. Will most likely use Home Assistant, been meaning to play with it just don't have anything to automate with it yet. I do eventually want to move my hvac control and existing environmental monitoring system over too and retire the serial based stuff so I can retire that physical server. HA will be in a VM.
3 of these fit perfectly inside a DIN enclosure. I think 1 should fit inside the smaller version of the enclosure, need to double check that.
