I am trying to incorporate these 12V permanent electromagnets to the BlueROV. The goal is to control a switch with the Pixhawk so that when activated, power is supplied to the electromagnet and the magnetic field is neutralized. The switch will be passively open and no power will be supplied to the magnets. Does anyone have any advice as to how this circuitry should be designed and any recommendations to specific hardware that I should purchase. I would think this should be a pretty simple task.
Here is a link to the electromagnets: APW Company: EML32mm-12 - Round Permanent Electromagnet 32 mm Dia. 12 volts DC - Holding 40 lbs.