The light sensor on the Circuit Playground Express is in the lower right corner below push button B marked with an ear.

This microphone is a bit different than some used in Arduino projects. Instead of an analog microphone, which requires an external op-amp and level management, the Circuit Playground Express uses a PDM microphone. This is a digital mic which is a lot smaller and less expensive. You will need to use  MakeCode/CircuitPython/Arduino support libraries to read the audio, you cannot read it like an analog voltage.

The following pages show how to easily use the microphone in your own project.

This guide was first published on Jul 26, 2018. It was last updated on May 21, 2024.

This page (Using the Sound Sensor) was last updated on Mar 08, 2024.

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