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.

» ExpressLRS - 868/915 Mhz equipment
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» Bournville 2023
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» Resurgam, Nordenfelts II & IV - George Garrett's works.
» Letter to BMFA to request the sharing of the 35MHz frequency for model subs in the UK.