Automation HAT Mini as pump controller

Hi All,

I would like to use the Automation HAT Mini to control a water pump. The pump includes an interface for a PLC that includes two pins that can be used to remotely Start/Stop the pump:

  • Pin 1 (Brown) for ‘Common’
  • Pin 2 (White) for ‘Digital Input (Start/Stop Signal)’

The ratings for the Digital Input (Start/Stop Signal) on the pump are as follows:

  • Voltage Range: 12-24 VDC
  • Max Voltage: 30 VDC
  • Logic High: > 6.0 VDC
  • Logic Low: < 4.0 VDC
  • Internally Pulled-Up to 12 VDC

Start/Stop (Full Remote)

  • The falling edge of the Start/Stop signal will start the pump. The Start/Stop signal must remain asserted (pulled low) to run the pump.
  • Pressing the local Stop button disables the system until the local Start button is pressed.

From what I can tell the Automation HAT Mini can only source 5V - so I will need a separate power supply (e.g., 9V?) to provide the logic signal voltage. What I hoping to get clarification on is how exactly to wire things up.

I was assuming it would look something like:

  • 9V(+ from power supply) > Pin 2 (on pump PLC connector)
  • Pin 1 (on pump PLC connector) to OUT1 on Automation HAT Mini
  • …where do I wire the ground from the power supply…do I wire GND (from power supply) to GND on the Automation HAT Mini?

I am still waiting for delivery of the pump and just want to be sure I get this straight in my head before it arrives. Any guidance/suggestion would be appreciated.