You can't beat simplicity for ballast tank control (with apologies to David F, JR, Nigel, etc)
This is the basic wiring diagram using two microswitches for flood/blow of a ballast pump.

This is the basic wiring diagram using two microswitches for flood/blow of a ballast pump.

» Servo Depth controller
» 27Mhz - Radio Ideas
» Robbe Seawolf V2
» BEC - Switch mode
» Cheap Arduino Auto leveler
» Pump for bladder system
» Wireless charging
» documentation for a robbe seawolf v2