Question 1

How do I play a WAV file on an ESP32 using I2S?

Accepted Answer

Use the easy_wav_player.py example after wiring an I2S DAC and SD card. Configure the default pins (SCK=32, WS=25, SD=33) as per the README, copy WAV files to the SD card, and run the script via REPL for playback.

Question 2

MicroPython I2S examples vs CircuitPython audio – which should I use?

Accepted Answer

Choose MicroPython I2S examples if you need hardware-agnostic code for boards like ESP32 or Pico; CircuitPython is better for Adafruit boards with built-in audio libraries and simpler setup but less flexibility.

Question 3

What's the best buffer size for recording audio with I2S on MicroPython?

Accepted Answer

Start with a user buffer of 5kB and internal buffer four times larger, as per the FAQ. Adjust based on gaps in recording to prevent overflow, considering SD card write speed inconsistencies.

Question 4

How to wire an I2S microphone to a Teensy 4.1 for audio recording?

Accepted Answer

Use I2S ID 1 with SCK=21, WS=20, SD=8 for receiving from a microphone, as shown in the MIMXRT GPIO table. Ensure proper power and ground connections using short wires for clean audio quality.

Question 5

Can I use MP3 files with MicroPython I2S examples?

Accepted Answer

No, the examples only support WAV files. You must convert MP3 to WAV using tools like online converters, which increases file size and storage requirements on SD cards.

Question 6

Why is there a gap in my I2S audio playback and how do I fix it?

Accepted Answer

Gaps are caused by buffer underflow; increase the internal buffer size relative to the user buffer, as recommended in the FAQ. Ensure SD card writes are optimized and wires are short to reduce latency.

micropython-i2s-examples

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