title: Power 3.3v board using analog pin
body: <p>What would be the reasons not to use one of the analog pins, set at 3.3v, to power a child board running at 3.3v?</p>
  
  <p>I suspect this is bad, but can't figure out why...</p>
  
  <p>Obviously I'm using a nano board that doesn't have a 3.3v pin...</p>