Stream PDM Input to CSV Output

General Description:

To use a PDM microphone you need to have a microcontroller that supports PDM input or a dedicated library.

The ESP32 supports PDM via the I2S API: We stream the sound input from a PDM microphone (PDM Digital MEMS MP34DT01) which we read in from the I2S interface and displays it on the Arduino Serial Plotter.

Pins

i2s-mic	ESP32
3V	3V
GND	GND
SEL	GND (GND or 3.3V)
CLK	WS (GPIO15)
DAT	IN (GPIO32)
-	BCK (GPIO14)

Additional Comments

You can select if you receive only data on the left or right by setting SEL to high or low.

Please note that in the 2.x realease of the Arduino ESP core, the WS pin is used as CLK. Prior to this it was BCK