Hi @sprinteroz - welcome to the group!
Going from memory - here’s what you’re looking at:
You can find most the stuff on Jon’s website https://www.freetronics.com.au/.
His light switch system has had a few different iterations - I believe he started with an EtherTen which is essentially an Arduino Uno plus an Ethernet shield combined into one board. It also allows for power-over-ethernet.
Each light switch reports over MQTT back to a server (RaspberryPi) all the button pushes.
The RaspberryPi runs the rules engine (OpenHAB) and sends messages over to (IIRC) another Ether10 with stacked shields to run the mains-rated relays.
His new system is based on one centralized EtherMega (Arduino Mega + Ethernet shield in one) in each cabinet. This is the one he rack-mounted in his newer video. Then all the light switches changed over to be just physical extensions of the IO on the EtherMega - there are no longer any “smarts” out at the light switches. The Mega has this shield which then runs over to these IO breakout modules.
He used these POE injectors in the system.
You can find a lot of the products directly on the SuperHouse store (click “Products” at the top) - here are some of the light switches with the PCB breakout for the RJ45 connectors. He never posted the wall plates since they are different country to country. Just pick up some blank plates and drill holes according to the PCBs.
I don’t know if he linked in the mains-rated relays anywhere; and I don’t remember if he ever mentioned the control voltage to said relays. Most industrial stuff is 24 VDC for control voltage to switch a 110/220 relay, so getting that running through an Arduino type board would take some careful consideration (or extra relays to step up the voltage). Running mains voltage through an Arduino (relay) even more so.
That all being said - tell us about yourself! What are your experiences with this type of stuff? What is your background?
Warning - disclaimer ahead
Keep in mind, of course, that working with MAINS VOLTAGE CAN KILL YOU and could easily cause a catastrophic house fire. You’ll note foremost in a lot of Jon’s projects that he talks about building to codes & standards, providing lots of documentation, and so on - and that is all very important and one of the reasons that we love seeing what he has done.
Another thing to consider is that Jon literally gutted and rewired his /entire/ house to do a ‘home run’ for every light in the house. The mains cabling for the lights run back to one of two control cabinets where the relay bank is located. To turn the light on and off in a bedroom, the overhead light mains voltage line runs over to the control cabinet off in another part of the house to get switched. The same would apply if you’re using 12V lighting.