Current Switch

CR Magnetics CR9321-NPN Current Switch Product Review

CR Magnetics CR9321-NPN

Home automation and monitoring is a hobby of prokopyshen.com. Recently, we wanted to add monitoring to a replacement sump pump in our basement. Our Arduino based system monitors digital inputs on a real time basis every second, so I needed a simple on/off detection system for when the pump motor was drawing current.

The CR Magnetics CR9321-NPN Current Switch looked perfect for the job.

 

Read more for my review of this wonderfully simple to use device and how I connected to my Arduino.

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