New Zealand wall switches
After an exhaustive search I have failed to find suitable wall switches to fit the wall boxes in my home. I am not going to butcher my finished concrete walls to take 68 square euro boxes, so have decided to make my own. I do not have mains wiring in the walls, just a twisted pair plus ELV pair. I have decided to use modbus as the serial prootocol. If anyone else is interested in having some Aussie / New Zeland sized wall switches at a sensible price, now would be a good time to let me know. I am creating three, four and six illuminated button versions, and including temperature measurement and annunciator. I am open to the configuration of status register ideas all suggestions welcome.
I am not interested in radio frequency switches (far too much steel and concrete to work reliably, even 5GHz WiFi really struggles here) and not interested in telling China which switch is on today, hence a hard wired local solution. Power is 12 Volt and expected consumption about 20mA at idle.