The button states could easily be read by using an Arduino’s analog input. A Pro Mini model was chosen for its small size as it could be housed in the radio compartment of the dash.

Just connect an piezo to the board and you are good to go. Pin 11 is used in every sketch because some piezo speakers can be connected between it and the close GND pin without any wiring. You can use ...

A digital metronome using Arduino UNO. Additional materials include: an LCD display, two piezo buzzers, eight LEDs, and six push buttons. - geeyana/Arduino-UNO-Metronome ...

Buttonless proof-of-concept smartphone SmartClik is buttonless proof-of-concept smartphone design based on Boréas’ BOS1901, the lowest-power piezo driver IC for HD haptic feedback in smartphones, ...

Arduino pins, and almost everything else at a standard hobbyist scale, are 0.1" pin spacing - so I just soldered the sense wires to some 0.1" headers I have laying around.