<li><a href="JSONConfigRef.htm#pca9555">PCA9555 (GPIO extender)</a>
   <li><a href="JSONConfigRef.htm#pca9685">PCA9685 (PWM controller)</a>
   <li><a href="JSONConfigRef.htm#tlc59116">TLC59116 (PWM controller)</a>
   <li><a href="JSONConfigRef.htm#tlc5940">TLC5940 (PWM controller)</a>
</ul>
<p>
   The PWM controllers chips give you ports where you can control the brightness
   or intensity of the effect.  This lets the ports do things like dim LEDs
   and adjust motor speeds. Pico GPIO ports also provide PW