chips as you have connected.  You can then refer to each chip
   by its array index - 0 for the first entry in the array, 1 for the second, etc.
</p>
<p>
   We're finally ready to set up the <a href="JSONConfigRef.htm#buttons.source.type=pca9555"><tt>buttons.source</tt></a> for a button
   connected to a PCA9555 port:
</p>
<pre>
   {
      buttons: [
         // button #0
         {
            source: { type: "pca9555", chip: 0, port: "IO0_1" },
         },
      ],
   }
</pre>

<h4>74HC165 input shift reg