I currently have a 7 zone system with a master valve at the offtake from my mains connection.
I have some rainwater tanks which i’d like to use preferentially when i have water in them.
What i am proposing to do is install an ultrasonic level gauge, and with an Arduino controller switch a low voltage (24v) relay. The Rachio Master valve signal wire would be wired to the common connection on relay. Then i would attached the Master Valve wire to the NC and then add a Pump Start relay connection to the NO.
With some logic on the Arduino, if i have sufficient tank water, the Rachio master valve signal would be sent to the pump start relay (via my Arduino low voltage relay) and then when i run out of tank water it switches over to activate my master valve and use mains.
Couple of questions i have
- Does anyone see any issues with the rachio feeding into a low voltage relay to switch between master valve and pump start relay signal?
- I am yet to buy a pump. I think i just get a pressure pump and wire in the pump start relay which would only provide power to the pump when the rachio activates it.
any help would be greatly appreciated.