A previous Design Idea described a single-wire-plus-ground-return, keypad-to-microcontroller interface in which a single pulse represents each keystroke (Reference 1). The pulse's width is ...

The interfacing is courtesy of a Teensy microcontroller board as in so many other keyboard projects, but what makes this extra-interesting is the way the Coleco keyboard speaks to the world.

Many microcontrollers with USB host support can do that for ages, no need for the latest hyped hobbyist fad. And obviously, USB interface chips exist, such as the one you can find on something ...

You can use a microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can use a resistive voltage divider to identify a pressed key (Reference 1).A ...

If you want your MIDI keyboard to control software in your computer’s DAW, you want to send MIDI out from the keyboard to the ...