The background project for this code could be a simple calculator using an Arduino 3.2" TFT LCD Touch Screen. The touch screen would have buttons that perform basic arithmetic operations such as ...

Each file corresponds to one combination Arduino Uno + LCD + one /two / three sensors. Pinouts are specified in the corresponding file. For the experiments with three sensors, we have used also the ...

This suits the commonly available Arduino shields which combine a 16×2 character LCD with a set of four tactile buttons in a cross formation.

No multimeter handy (for shame)? Well, as it turns out you can actually measure capacitance using your Arduino Uno, with no external components, and only ~20 lines of code.