USB connector switch

Official Hardware UNO Family UNO R4 WiFi
20

Thanks, I agree with you. As a last test now also having done a cold ohm/resistance measurement, there is only a 5 Mega-ohm (thus NO) connection to either ESP or RA4 between USB pins.

That leaves 3 issues:

  1. The schematics need to be updated to reflect "do not populate"
  2. The documentation needs to be updated to reflect that 21 instead of 40 should be used for SW USB switch.
  3. The documentation needs to include a warning NOT to apply the USB HW and SW switch at the same time, as pulling P408 LOW will cause a short circuit causing serious damage.

regards,
Paul