PIC, AVR, and Arduino are ubiquitous in projects these days and a lot of the time it’s easy to over-complicate things with their use. In this case, [Tod] wanted to use a momentary tactile swi… ...

To read each button push, the Arduino brings one keypad input line high and checks the voltage of the ... we’ll treat it like the coil of a stepper motor and use a TIP120 transistor to supply ...