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Get a relay module of either 5V or 12V based on power supply of arduino.Feed in the power and use the digitalwrite method to set any pin high like pin 13.This pin should be connected with the relay.And don't use this method.The sensor can't withhold the moisture and humid condition of the tank and will stop working soon.I had tried this and it failed in 2 days because of the sensor.Use magnetic float sensor instead