…or if you want to re-use your existing intercom and hook it up to MQTT, see https://michael.stapelberg.ch/posts/2021-03-13-smart-interco... for how I did that :)
I built a self igniting torpedo heater for a powder coat oven but even though it worked, I still feel like I stumbled through every step instead of understanding any of it. Like building a piece of software using SO snippets and just trial and erroring it until it works ;-)
Do you have any tutorial (series) recommendations for semi beginners on stuff like this? Maybe some “hardware explained for a software developer”? :D
Have you looked into Raspberry Pi. I use these for even very simple things, just because it’s so easy to get up and running. Way over spec’d of course but if you jus want to “get something done” they can’t be beat.