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 ...

[Jordan] managed to cobble together his own version of a low resolution digital camera using ... The diode is connected to an analog input pin on an Arduino. The sensor can be pointed at an ...

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.