Raspberry Pi Pico Project - Amplified MP3 Playback

NOTE:

Had to install CircuitPython to replace MicroPython
Match the project files that you use with the CircuitPython version you are using. I used version 9 which was alpha.
To use an mp3 for this project it needs to be less than 64kbit/s with sample rates between 8kHz and 24kHz to work.
Used one pico for testing on the breadboard and another for finished product. The testing pico had pins soldered to it for easy bread board use. I soldered these previously but you can also buy them pre-soldered.

Parts/tools I used:

Here are some links on Amazon and Adafruit. The Amazon links are paid affiliate links.

Steps I took:

Placed Raspberry Pi Pico on bread board ( pins previously added )
Soldered wires and connector to amplifier
Connect speaker to amplifier ( using tiny screws)
Plugged Amp wires into bread board to connect to the pico
Hold bootsel button and connect USB cable (pico shows up as drive)
Download CircuitPython
Download Adafruit project files ( just python and mp3 file needed, lib wasn’t actually included but wasn’t needed )
Copy CircuitPython install file to disk ( will show up as a CircuitPython drive instead now )
Copy Adafruit python file and mp3 file

Should be working when plugged in now

Unplugged amp from breadboard
Soldered amp wires to second “production” Raspberry Pi Pico
Copied CircuitPython and project files to this second Raspberry Pi Pico ( same as steps for first one )
Solder battery connector and power switch

This is the first example from the Adafruit guide:



# SPDX-FileCopyrightText: 2021 Kattni Rembor for Adafruit Industries
#
# SPDX-License-Identifier: MIT

"""
CircuitPython single MP3 playback example for Raspberry Pi Pico.
Plays a single MP3 once.
"""
import board
import audiomp3
import audiopwmio

audio = audiopwmio.PWMAudioOut(board.GP0)

decoder = audiomp3.MP3Decoder(open("slow.mp3", "rb"))

audio.play(decoder)
while audio.playing:
    pass

print("Done playing!")