SoundBox

Sound box like a board to launch samples stored as 8bit full-rate (32000) mono WAV files named from 1.WAV to 8.WAV (16.WAV) on a SD card with arcade buttons using a multiplexer

Pinout

SD Card > Arduino pinout:

SCK  (5) -> Pin 13 must be!
CS (1)   -> Pin 10 (Chip select)
MOSI (2) -> Pin 11 must be!
MISO (7) -> Pin 12 must be!

Speaker -> Arduino pinout:

Speaker (sound) -> Pin 9 and GND

Multiplexer > Arduino pinout:

S0 -> Pin 2
S1 -> Pin 3
S2 -> Pin 4
S3 -> Pin 5 if you have a CD74HC4067 mux and provide 16 arcade buttons
SIG (Z or A) -> Pin A0
SIG (Z or A) -> Pin 6 if you have a 2nd mux for 5V luminated buttons

Multiplexer -> Arcade buttons / leds:

A0 -> Button 1
..
A7 -> Button 8
..
A15 -> Button 16

References and used libraries

TMRpcm library for audio playback from SD card https://github.com/TMRh20/TMRpcm or install it from Arduino IDE Lib Manager

How to deal with mux and demux https://learn.sparkfun.com/tutorials/multiplexer-breakout-hookup-guide/all

Convert audio to WAV with sox

This sox command will convert an MP3 file into 8bit 32k rate mono wave file.

sox audiofile.mp3 --norm -b8 -r32000 -c1 1.WAV

You may install the libsox-fmt-mp3 package to support MP3 convertion.

Enclosure printing

Refer to Thingiverse.com for STL download or use the Customizer to make your own case https://www.thingiverse.com/thing:3830885

Pictures

Prototype connection with jumper wires and bread board

Final assembly with dupont cables and soldered wires

Demo video