Alternative Water Supply

[Gene]

This thread may be of interest to you.

Mains and tank water selector

Hi Everyone 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 re…