Raspberry Pi Getting Started
Infineon's I2S microphone solutions are compatible with many Raspberry Pi models. Please check below for a full compatibility list.
This guide describes how to easily get started with a Raspberry Pi and the Infineon I2S stereo microphone Shield2Go.
| Platform | Compatible |
|---|---|
| Raspberry Pi 4 Mod. B | ✔️ |
| Raspberry Pi 3 Mod. B+ | ✔️ |
| Raspberry Pi 3 Mod. B | ✔️ |
| Raspberry Pi 3 Mod. A+ | ❓ |
| Raspberry Pi Zero | ❓ |
| Raspberry Pi Zero W(H) | ❓ |
| Raspberry Pi 2 Mod. B v1.2 | ❓ |
| Raspberry Pi 2 Mod. B | ❓ |
| Raspberry Pi 1 Mod. B+ | ❓ |
| Raspberry Pi 1 Mod. B | ❌ |
| Rapsberry Pi 1 Mod. A+ | ❓ |
| Raspberry Pi 1 Mod. A | ❌ |
- Connect the IM69D130 Microphone Shield2Go to your Raspberry Pi
Pin connection:
| Microphone Shield2Go | Raspberry Pi |
|---|---|
| 3.3V | 3V3 |
| GND | GND |
| DATA | BCM 20 |
| BCLK | BCM 18 |
| CLK | BCM 19 |
Using Infineon's Shield2Go Adapter for Raspberry Pi
Use the adapter to connect the microphone Shield2Go as shown in the picture:
ℹ️ The microphone Shield2Go can be combined with other Shield2Go boards.
Set up Raspberry Pi with Raspberry Pi OS or similar OS. Check this page for instructions.
You can access your Raspberry Pi either using a monitor and a keyboard or using SSH in a headless setup as described here.
Now insert the microSD card into your Raspberry Pi and connect the power supply to boot it up.
To enable I2S on your Raspberry Pi you have to follow a few installation steps. We recommend to follow this guide by Adafruit. The following steps are taken from this guide:
sudo apt-get update
sudo apt-get upgrade
afterwards reboot your Raspberry Pi.
sudo apt-get install python3-pip
cd ~
sudo pip3 install --upgrade adafruit-python-shell
wget https://github.com/raw/adafruit/Raspberry-Pi-Installer-Scripts/master/i2smic.py
sudo python3 i2smic.py
and follow the instructions given in the script.
The script will ask Auto load module at boot? [y/n]. Please confirm with y.
Make sure to reboot after running the script.
As a final check run
arecord -l
if a device named sndrpii2scard or similar is listed everything worked as expected.
Let's now test if audio recording works as expected. We can record an audio sample with this command:
arecord -D plughw:1 -c2 -r 48000 -f S32_LE -t wav -V stereo test.wav
By default, the sound level of the recording is very low, but so is the noise, hence you can easily amplify the output file e.g. using sox:
sudo apt-get install sox
sox test.wav test_norm.wav --norm=0 trim 10
--norm=0 normalizes the output file to 0 dB and trim 10 cuts the first 10 seconds of the audio file. This is recommended if you get a clipping peak in the beginning of the recording, because otherwise the normalization does not work correctly.
Your Raspberry Pi is now ready to work with I2S devices.
Check out this page for application examples.