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Northstar
We had something like this a while back and then one fine day we found out the pump was running constantly and panicked about how to switch it off.next, i'll try automating water supply at my home. Pi is little costlier for this setup but i am more comfortable in fiddling with software than coming up with a totally sensor based hardware solution.
The sensor indicating the tank was full died, so the pump thought the tank was not yet full and ran non-stop. We have gone back to the manual way of doing things as the upstairs tank where the sensors are located isn't readily accessible.