Build a Sump-Fill Level Controller

摘要

Recently, someone told me that they were having problems with their sump pump. The float had a leak causing it to sink, or else the float switch was bad. He wasn't quite sure what the problem was. At any rate, the sump pump failed to work and resulted in a back-up that flooded their basement and ruined many of their possessions stored there. Another friend said that he wanted to control an elevated cistern that fed plants in a hydroponic garden.