connect to the row R1-R4 pinouts of the keypad byte colPins[COLS] = {2, 3, 4}; //connect to the column C1-C3 pinouts of the keypad Next is a project example, where the Arduino is instructed to do ...

If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects ...