I am currently attempting to mod a Nintendo 64 case to house my raspberry pi 3. I want to keep the original controller ports, but the port only has 3 pins. Would wiring a usb cable without the ground wire connected have any adverse affect?

  • \$\begingroup\$ Imagine a battery with only one terminal. How will you complete the circuit? Where will the electrons come from and where will the electrons flow to? \$\endgroup\$ – Harry Svensson Aug 3 '17 at 2:19
  • 1
    \$\begingroup\$ Wiring two connectors with disregard to pin functions is not very smart to say the least. \$\endgroup\$ – Dmitry Grigoryev Aug 3 '17 at 9:21

Yes, there is a negative effect -- it won't work!

A ground is required as a reference for the USB VBUS line. Without a ground, current cannot flow through the device, so it will not work.

You need all four contacts (GND, VBUS, D+, and D+) to attach a USB device. You can't get away with fewer.

| improve this answer | |
  • \$\begingroup\$ VBUS isn't necessarily required. \$\endgroup\$ – Matt Young Aug 3 '17 at 2:22
  • 1
    \$\begingroup\$ @MattYoung VBUS is required for a self-powered device to know it has been inserted. \$\endgroup\$ – Jeroen3 Aug 3 '17 at 5:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.