Making USB headset using Raspberry pi pico

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

Hardware

• RP2040 board
  • Raspberry Pi Pico
• Microphones
  • PDM
    • Adafruit PDM MEMS Microphone Breakout
  • I2S
    • inmp441
    • [Adafruit I2S MEMS Microphone Breakout - SPH0645LM4H] (https://www.adafruit.com/product/3421)
  • Analog
    • [Electret Microphone Amplifier - MAX9814 with Auto Gain Control] (https://www.adafruit.com/product/1713)
• DAC
  • PCM5102a

Default Pinout

PDM Microphone

Raspberry Pi Pico / RP2040	PDM Microphone
3.3V	VCC
GND	GND
GND	SEL
GPIO 18	PDM1 DAT
GPIO 19	PDM1 CLK
GPIO 20	PDM2 DAT
GPIO 21	PDM2 CLK

INMP441 Microphone

Raspberry Pi Pico / RP2040	I2S Microphone
3.3V	VCC
GND	GND
GPIO 14	SD
GPIO 15	SCK
GPIO 16	WS

SPH0645 Microphone

Raspberry Pi Pico / RP2040	I2S Microphone
3.3V	VCC
GND	GND
GPIO 10	SD
GPIO 11	SCK
GPIO 12	WS

Analog Microphone

Raspberry Pi Pico / RP2040	MAX9814 Microphone
3.3V	VCC
GND	GND
GPIO 26	OUT

PCM5102a DAC

Raspberry Pi Pico / RP2040	I2S DAC
3.3V	VCC
GND	GND
GPIO 2	SD
GPIO 3	SCK
GPIO 4	WS

GPIO pins are configurable in examples or API.

Examples

See examples folder.

Cloning

git clone https://github.com/denisgav/pico-usb-headset.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 .. -DPICO_BOARD=pico
make

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

Acknowledgements

To create this project, following references were used:

• The TinyUSB library.
• 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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