This Arduino Pump Tutorial shows an example of how to use a float switch, Powertail, and pump to create a sump pump system. When you want to operate larger pumps from an Arduino you need a stronger relay to handle the larger voltage and current. The PowerSwitch Tail
is a perfect tool for the job. It incorporates the relay and outlet plugs all into one unit making it easy to turn on and off larger motors, fans, and pumps.
We also recommend checking out these other Arduino Pump Tutorials:
Arduino ShotBot Project
Arduino Pump Tutorial - Aquarium Auto Refill