Hi there, I have a switched power cord (commercial solution with a Finder 40.61 DC sensitive relay, 5 V coil, 50 Ohm, 4-7.5 V working range) that is supposed to be plugged into a USB port. If there's 5 V on the USB line the relay closes. What I want to do is control (and power) the relay from an Ar…

Powering and controlling a relay from an Arduino Ethernet with PoE

johnwasser September 15, 2012, 7:29pm 2

Can't you just use a single PNP transistor to switch 5V from the Arduino regulator?

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