esp32 micropython mp3

MicroPython is a great way to program the ESP32 to play MP3 files. Here's a simple example of how to do it:

import machine
import time
import uos

# Define the pin numbers
BCLK_PIN = 32
DOUT_PIN = 33

# Set up the I2S interface
i2s = machine.I2S(
    mode=machine.I2S.MASTER_TX,
    bck=BCLK_PIN,
    ws=0,
    sd=DOUT_PIN,
    # Set the sample rate to 44100 Hz
    # This is the standard sample rate for MP3 files
    # You can change it to match the sample rate of your MP3 file
    # but keep in mind that not all sample rates are supported
    # by the ESP32's I2S interface
    standard=machine.I2S.PHILIPS,
    dataformat=machine.I2S.B32,
    samplerate=44100,
    # Set the number of channels to 2 (stereo)
    # This is the standard number of channels for MP3 files
    # You can change it to match the number of channels in your MP3 file
    # but keep in mind that not all numbers of channels are supported
    # by the ESP32's I2S interface
    channelformat=machine.I2S.RIGHT_LEFT,
)

# Define the MP3 file path
FILE_PATH = "/flash/song.mp3"

# Open the MP3 file
file = open(FILE_PATH, "rb")

# Read the MP3 file header to determine the length of the file
file.seek(0)
header = file.read(4)
file.seek(0)
file_size = uos.stat(FILE_PATH)[6]
length = int((file_size - 4) / 410)

# Loop through the MP3 file and play it
for i in range(length):
    # Read a chunk of data from the MP3 file
    data = file.read(410)
    # Write the data to the I2S interface
    i2s.write(data)
    # Wait a short amount of time between chunks
    time.sleep_ms(1)

# Close the MP3 file
file.close()

# Stop the I2S interface
i2s.stop()

This code sets up the ESP32's I2S interface to play an MP3 file, reads the MP3 file from flash memory, and writes the data to the I2S interface. It loops through the file and plays it in chunks, waiting a short amount of time between each chunk. When it's done playing the file, it stops the I2S interface.