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About Nano boards with disabled 5 V pins

Why the 5 V pin is disabled

The following boards operate at 3.3 V, and have the 5 V pin (D12) disabled out of the box:

This is a safety precaution, as connecting higher voltage signals to the board can damage the hardware.

Enabling the 5 V pin

The 5 V pin will be enabled if:

  • The pads marked VUSB are shorted.
  • The board is powered by a USB connection.

The VUSB is located on the bottom of the board. The pads on the Nano 33 BLE Sense are highlighted below.

The VUSB pads on the Nano 33 BLE Sense

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