A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad wired as an X-Y switch matrix, normally-open ...

Of course, it can switch faster than a mechanical switch and is easy to control, so — as always — its a tradeoff. Notice, too, that the mux chip can operate rail-to-rail.

I have started this joystick controller experiment inspired by the need of a simple DIY joystick which could deliver greater flexibility in the possible designs. Hardware component basis is very ...