West marine sells them. In a message dated 4/18/2012 3:36:51 P.M. Eastern Daylight Time, j...@fayettedigital.com writes:
This seems like dejavu but I recall seeing a pump demonstrated at a SSCA meeting that had a controller built in. The pump would run at a specific interval, like every 5 minutes or so and the controller would measure the current draw. If there was no load on the pump, it would turn off. If there was a load it would monitor the current and shut off when the current dropped off after a slight delay. I'm thinking of using an Arduino to build same thing. Of course I'd still have a conventional pump for backup. Sounds like a fun project. I even went so far as to pick up some 0.1 ohm resistors. The Atmega328 has a reasonable ADC on board. Now if I can just find that round tuit. Jim.
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