I just got a new Culligan HE water softener - and it is a whole house unit - and I have some of my sprinklers feeding off of it. Therefore - when I run those sprinklers I need the water softener to go into bypass mode. There is a board in the unit that simply works off of a timer, and feeds 5v constantly to the AuxIn on the board - and when the time to bypass is hit, it stops sending voltage, which triggers the bypass.
I would love to have the bypass only on while the rachio is watering… In my mind - I can hook up a 5v power supply and have a relay that is normally closed (NC) controlled by the master pump 24VAC line that would then break the 5v connection (dropping voltage to zero). It would be simpler if I could have the rachio always send voltage down that line and go to zero once it’s active - that way I would just need a voltage converter that goes from 24VAC to 5VDC.
Has anyone done this? I would love to hear what you did, and if my idea is too complicated.