My weather station project involves an Arduino Pro Mini. In the local station, power would normally be supplied to the Pro Mini from an FTDI USB connection which allows received data to be logged in Excel. In some circumstances it might be used as a stand-alone unit merely displaying received data on an LCD display. As a stand alone, power would be supplied to the Pro Mini from the on-board regulator.
180703-LWS-Circuit.pdf (55.0 KB)
To allow for both configurations I included a two-pin connection
I can use as a bridge. In data-logging mode the there would be no connection from the on-board regulator to the Pro Mini - in stand-alone I would plug in a bridge (and unplug the FDTI breakout ) to connect the Pro Mini to the regulator. This creates a problem with the Electrical Rules Checker:
How can I deal with this so that everything is kosher?