I hired an engineer to develop a (Detection Device) for water and lint. It was to be used on common appliances like (Lint) detection - Refrigerators, Dryers, Furnace. For (Water) Washers, Dishwashers Etc.
This device could power a 15amp motor to suck out water or to drive relay's buzzers or shut off the appliance and alert the customer to the problem.
Lint accumulation can become a fire hazard in a Dryer. But Refrigeration it shortens the life of the system (Keeps it from running cool on the condenser side of things.) The same unit detected both.
Playing around with that thing and watching it work was the coolest thing ever.