To get ready, he made a breakout board for 32-channel analog multiplexer device he wants to use. He put the project out on Hackaday.io and also has a video tutorial you can see below. There are ...

Among all the Arduino boards ... One is using an analog input like a potentiometer. In this case, the analogWrite() value is dependent on the value read from the input. This analog input reading ...

In the usual sense, a quantizer transforms an analog signal (with an infinity of possible values) to a smaller (and finite) set of digital values. An A/D converter is a perfect example of a quantizer.