microphone-array-library-for-pico

Raspberry pi pico library for 6+1 microphone array connection.

Capture audio from a microphone array on your Raspberry Pi Pico or any RP2040 based board. 🎤

Hardware

• RP2040 board
  • Raspberry Pi Pico
• Microphone array
  • [6+1 Microphone Array] (https://www.dfrobot.com/product-1976.html)

Default Pinout

Raspberry Pi Pico / RP2040	Microphone	Configuration Define
MIC_CK	0	PIN_SCK
MIC_WS	1	PIN_WS = PIN_SCK + 1
MIC_D0	2	PIN_SD0
MIC_D1	3	PIN_SD1 = PIN_SD0 + 1
MIC_D2	4	PIN_SD2 = PIN_SD1 + 1
MIC_D3	5	PIN_SD3 = PIN_SD2 + 1
LED_CK	15	LED_PIN_CLK
LED_DA	14	LED_PIN_DIN

VIN of the microphobe should be connected to the 5V of the power supply. GND of the microphobe should be connected to the GND of the power supply and Raspberry Pi Pico. Since the library is based on pio functionality, different ports on raspberry pi microcontroller can be used.

GPIO pins are configurable in examples or API.

Examples

See examples folder.

Cloning

git clone https://github.com/denisgav/microphone-array-library-for-pico.git

Building

1. Set up the Pico C/C++ SDK
2. Set PICO_SDK_PATH

export PICO_SDK_PATH=/path/to/pico-sdk

3. Create build dir, run cmake and make:

mkdir build
cd build
cmake .. 
make

4. Copy example .uf2 to Pico when in BOOT mode.

Acknowledgements

To create this project, following references were used:

• The TinyUSB library is used in the usb_microphone_array and usb_microphone_array_led examples.
• Machine I2S https://github.com/sfera-labs/arduino-pico-i2s-audio
• SK9822 LED https://github.com/raspberrypi/pico-examples/tree/master/pio/ws2812
• Microphone library for pico https://github.com/ArmDeveloperEcosystem/microphone-library-for-pico.git

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