The sensor shown here is essentially two plates mounted side-by-side, attached to an Arduino Nano using the Capacitor library which uses just two pins, one digital and one analog. As configured ...

Then, chances are you already know what an Arduino ... analog input pins than the Uno. But it's also worth noting that only six out of the eight analog pins on the Nano can be used as digital ...

An Arduino Nano is charged with running the show, capturing audio via its analog-to-digital converter. A sensitivity pot enables the input level to be set appropriately. From there, a Fast Fourier ...

Apart from understanding the ... the Nano and Micro feature 20 digital pins, labeled as RX, TX, D2 to D13, and A0 to A5. Among these, six (A0 to A5) double as analog input pins on both boards.