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ADMP441 MEMS I2S driver for Raspberry Pi.

Breakout Board

Purchased from OSHPark via https://github.com/SamEA/ADMP441_Microphone.git

BOM

OSHPark

  1. R1 - 100kOhm
  2. C1 - 100nF
  3. U1 - ADMP441 MEMS desoldered from Amazon Dash

Raspberry Pi

ADMP441 RPi
WS 19
SD 20
SCK 18
VCC 1
GND 9

Kernel

Run make && make install in the linux directory

Device Tree Overlay

cd dts
dtc -@ -I dts -O dtb -o i2s-soundcard.dtbo i2s-soundcard-overlay.dts
sudo cp i2s-soundcard.dtbo /boot/overlays

Configuration

Add admp441 to /etc/modules

Add dtoverlay=i2s-soundcard,alsaname=mems-mic to /boot/config.txt

Reboot!