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USB Power Supply via a Relay

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Discussion in 'General Electronics Discussion' started by DustyBottoms, Jun 30, 2019.

  1. Jun 30, 2019 #1
    DustyBottoms

    DustyBottoms

    1
    0
    Jun 30, 2019
    Hello,

    my question is a simple one, please don't laugh. :)

    I want to power on and off a USB device via a relay. I already programmed it. My question is pretty basic:
    I need to connect the red cable (+5V) to the relay to on and off the device, but do I also need to connect the black cable (ground) to the relay, or can I just connect the ground cables directly?

    Thanks!
     
  2. Jun 30, 2019 #2
    BobK

    BobK

    7,592
    1,636
    Jan 5, 2010
    No, you don’t need to run the black connection through the relay.

    Bob
     
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