Talking Photo? Program using CircuitPython on Maker Pi Pico.

code.py

"""
  Talking Photo? Program using CircuitPython on Maker Pi Pico.
  
  Items:
  - Maker Pi Pico
    https://my.cytron.io/p-maker-pi-pico
  - Capacitive Touch Sensor
    https://my.cytron.io/p-ttp223-capacitive-touch-sensor-module
  - MakerDisk microSD Card
    https://my.cytron.io/p-raspberry-pi-approved-makerdisk-microsd-with-rpi-os
  - 5mm Copper Foil Tape
    https://my.cytron.io/p-5mm-copper-foil-tape-with-conductive-adhesive-25m
  - 6W Stereo Speaker
    https://my.cytron.io/p-6w-stereo-usb-powered-3-5mm-jack-speaker-black
  - USB Micro B Cable
    https://my.cytron.io/p-usb-micro-b-cable
  
  References:
  - https://gist.github.com/idriszmy/47ce97a34c07a9b3da79d4121269a40b
  
  Last update: 8 Mar 2022
"""

import os
import time
import board
import touchio
import busio
import sdcardio
import storage

from audiomp3 import MP3Decoder # pylint: disable=wrong-import-position

try:
    from audioio import AudioOut
except ImportError:
    try:
        from audiopwmio import PWMAudioOut as AudioOut
    except ImportError:
        pass  # not always supported by every board!

touch_pad = board.GP5
touch = touchio.TouchIn(touch_pad)

spi = busio.SPI(board.GP10, board.GP11, board.GP12)
sd = sdcardio.SDCard(spi, board.GP15)
vfs = storage.VfsFat(sd)
storage.mount(vfs, '/sd')

mp3files = sorted("/sd/" + filename for filename in os.listdir("/sd")
    if filename.lower().endswith("mp3"))

# You have to specify some mp3 file when creating the decoder
mp3 = open(mp3files[0], "rb")
decoder = MP3Decoder(mp3)
audio = AudioOut(board.GP18, right_channel=board.GP19)

total_mp3 = 3
count = 0

while True:
    if touch.value:
        print("Touched! Playing mp3-{}...".format(count))
        filename = mp3files[count]
        count += 1
        if count == total_mp3:
            count = 0
        # Updating the .file property of the existing decoder
        # helps avoid running out of memory (MemoryError exception)
        decoder.file = open(filename, "rb")
        audio.play(decoder)

        while audio.playing:
            pass

        print("Done.")

    time.sleep(0.05)