ister</h4>
<p>
   The 74HC165 is another way to add more input ports to the Pico, to
   supplement its limited number of native GPIO ports.  This chip requires
   three GPIO connects on the Pico, and gives you 8 input ports in return.
   That's a pretty meager gain, but once you've attached one 74HC165
   to the Pico, you can add any number of additional chips in a daisy
   chain, without taking up any more GPIO ports.  If you string together
   four of these chips, you get 32 button inputs, which is ample 