I'm ok (in my own view!) at electronics but there are probably lots of better ways of hacking together what I try and do hence I will ask here.
I am setting up a pi (B+) to use domoticz to control some z-wave thermostats. I also want the pi to control the boiler and 10 other zones (8 underfloor heating zones, HW and another zone). At the moment each zone has a thermostat that is just a relay for 240v AC that feeds back to a a central Zelio Logic PLC (SR1 A201FU) that controls the boiler (also a 240V AC relay) or to another relay board for the UFH that triggers the boiler also. I tested 6V DC through one of these stats and it seems fine too. I have a 16 channel AC relay that I can use to control the boiler and each of the UFH zone actuators (also 240V). Should I just connect all room thermostats to a GPIO IN pin (with protection to drop volt/amps) and then use GPIO OUTs to control the relays for the actuators and the boiler? My relays need ~12V.
Or I could leave the UFH stats control the actuators and just take the out from there to the pi but then I would only know when UFH kicked in and not which one. I lose first 10 pins of the GPIO for the razberry z-wave controller so I might not have enough pins. I also have a ardurino uno I could break out too.
Code: Select all
UFH [Stat 1] ... [Stat 8] [Zone 1 (with TRVs] [HW] [Zone 2] | | __________________|_____| | | [ Relay board ] _________ [ PLC ] ________________________ [Boiler] | [Actuator 1] ..... [ Actuator 12]
Any advice muchly appreciated!