Originally Posted by Holding Tank
Friends; ... the holding tank radar
can be made smaller than a pack of cards and the cost can be less than $50 in parts
. Modern chips are amazing, and are being made in quantities because of automotive applications (so becoming cheap).
Remember; I am an old retired radar
scientist (and a sailor), so I really do know how to do this cheaply.
I'd be looking at the motorhome market as well, I could use one on my class B's dooky tank. I can hold the flapper open and look down there with a flashlight but thats kind of a crap shoot...
I'm thinking it should only measure (use its radar) when told to, to save on the battery
. Or maybe just measure once a day to send an alarm
if its filling up.