Hello fellow enthusiasts, I wanted to share my journey and experiences with integrating I2S audio into a hearing assistance device. This project has been both challenging and rewarding, and I hope my insights can inspire or assist others in similar endeavors.
Starting with the basics, I2S (Inter-IC Sound) has been a game-changer for audio quality and processing capabilities. I recently began experimenting with the Seeed Studio XIAO ESP32-S3 controller, paired with MAX98357 amplifiers and INMP441 microphones. The goal was to create a headset that could process and play audio from the microphones to the speakers with minimal latency and high fidelity.
One of the key decisions was moving away from ESPHome for the build. While ESPHome is fantastic for many projects, the need for advanced audio processing, such as a 3-band equalizer and pitch-shifting, led me to the Arduino_Audio_Tools library. This library offers a wealth of features that are essential for a hearing assistance device, allowing for more personalized audio adjustments.
The initial setup involved configuring the I2S pins and setting up the microphones and speakers. Here’s a snippet of the configuration I used:
yaml
i2s_audio:
i2s_lrclk_pin: GPIOXX
i2s_bclk_pin: GPIOXX
i2s_mclk_pin: GPIOXX
microphone:
- platform: i2s_audio
id: mic_left
channel: left
adc_type: external
i2s_din_pin: GPIOXX - platform: i2s_audio
id: mic_right
channel: right
adc_type: external
i2s_din_pin: GPIOXX
speaker:
- platform: i2s_audio
id: spk_left
channel: left
dac_type: external
i2s_dout_pin: GPIOXX - platform: i2s_audio
id: spk_right
channel: right
dac_type: external
i2s_dout_pin: GPIOXX
This configuration sets up the left and right microphones and speakers, ensuring that audio is processed and outputted correctly. I also incorporated a play/stop switch and a volume control slider, which are essential for user interaction.
The journey hasn’t been without its hurdles. One of the main challenges was ensuring that the audio processing didn’t introduce latency, which is critical for a hearing assistance device. Testing different configurations and optimizing the code for efficiency was a priority.
I’m excited to share that the basic functionality is now working as intended. The headset can play audio from the microphones to the speakers, with volume control and the ability to start/stop playback. The next steps involve integrating the additional audio processing features, such as the equalizer and pitch-shifting, to make the device even more versatile.
This project has been a fantastic learning experience, and I’m grateful for the resources and communities that have supported me along the way. I look forward to sharing more updates as the project progresses and hearing about others’ experiences with I2S audio and hearing assistance devices.
If anyone has questions, suggestions, or experiences to share, please feel free to reach out. Let’s continue to innovate and improve accessibility through technology!