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Sprayer pump configuration for pixhawk 2.4.8

hello, i am building an agricolture hexacopter, with two 6S batteries in parallel
now i am searching for a pump and nozzle set that is suitable with my pixawk 2.4.8 and mission planner

in aliexpress i see two kinds of pumps

  • brushless
  • brushed

i read that brushless perhaps are better, and i found a motor pump : eaglepower wa3510 24V , that includes also an ESC to control it

I prefer eaglepower because all the motors of my hexacopter are eaglepower brand too

BUT i have a question:
how this pump must be connected to the pixhawk?
I think through the supplied ESC , but which port i have to use to connect this ESC, and how must be configured in mission planner?

In the other sprayer kits sold in aliexpress, i see that it is included a black box, called ‘governor’, and some of them have a brushed esc too.
I wonder if i need a governor too.

And, last question: if in the future i add two more motors, transforming the hexacopter to optacopter, i have enough port space in pixhawk to add the two new motors, or i cannot add them because one port is occupied by the spray pump esc?

Please help me,
thank you!

Lodovico

Servers by jDrones