Just a qucik thanks to all those invovled… I bought some cheap D1 Minis - ESP8266 devices, and after a couple tutorials and some videos… I have this thing connected to my home assistant and able to comunicate with it. So nice and simple - so much so - I think this is next on my list to build…:
https://www.elec-cafe.com/wemos-d1-mini-multi-sensor-with-home-assistant-esphome/
Great stuff…