The Encoded4To2Buttons.ino program implements the
BinaryEncoding wiring and decodes the
buttons using the Encoded4To2ButtonConfig
class. It was tested using 3 buttons on a breadboard using both diode.
Here is the schematic using 2 diodes:
Here is the breadboard that implements this circuit. I don't have a photo of the circuit using 3 buttons, but it was similar to this photo using 7 buttons:
