beyond the scope of this section, but you can find
   some circuit plans in the
   <a href="http://mjrnet.org/pinscape/BuildGuideV2/BuildGuide.php">Pinscape Build Guide</a>
   under the <a href="http://mjrnet.org/pinscape/BuildGuideV2/BuildGuide.php?sid=psOutputsStandalone">
      Pinscape Outputs Setup</a> section.  That's nominally about how to set up
   outputs for the KL25Z-based Pinscape, but most of what it says there carries
   over to the Pico.  Most of it can also be adapted to the PWM controllers,