Can someone help with this idea?

[Wonderd]

I'd like to set up a small DIY water too off system. My schematic can be seen below as well as the parts I'd like to use. I've received a little bit of conflicting advise on another forum if the board will work or not. Specifically "The schematic does not show a voltage regulator from 12 Volts to 5 Volts. There is a P9 mentioned in the schematic with separate 5 Volts and 12 Volts pins."

 

[Wonderd]

Original thread here https://forum.allaboutcircuits.com/threads/will-these-components-work-together.183378/#post-1686475

 

[Pommie]

I'd like to set up a small DIY water too off system.

I've no idea what that means. What are you trying to do?

Mike.

 

[Wonderd]

Sorry it should be "water top off system" when water gets certain level, trigger activates the pump and it pumps water until trigger goes to full position.

 

[throbscottle]

I'm inclined to think this will work - assuming those relay board inputs are actually active low. Don't see why anyone was worrying about a 5v regulator.
I would test to ensure the relays click when activated, and that the contact terminals behave as expected, before wiring up.