ADMP441 MEMS I2S driver for Raspberry Pi.

Breakout Board

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

BOM

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!