This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

BBC micro:bit sound


This sample demonstrates how to use a piezo buzzer connected to port P0 on the edge connector of the BBC micro:bit v1 or using the on-board buzzer on the BBC micro:bit v2.


Using BBC micro:bit v1, a separate piezo buzzer must be connected to the board. One example is the MI:Power board that has a piezo buzzer in addition to a coin-cell battery. Resellers of this board can be fairly easily found using online search.

The upgraded BBC micro:bit v2 board does not need a separate buzzer as it has one built-in on the backside of the board (marked as ‘speaker’).

Building and running

The sample can be built as follows:

Building for a BBC micro:bit v1

west build -b bbc_microbit samples/boards/bbc_microbit/sound
west flash

Building for a BBC micro:bit v2

west build -b bbc_microbit_v2 samples/boards/bbc_microbit/sound
west flash

Sample Output

This sample outputs sounds through a piezo buzzer based on button presses of the two main buttons. For each press the current output frequency will be printed on the 5x5 LED display.