Currently broken ; Adafruit changed something in touchio for CircuitPython 4.x, and it doesn't work any more
Simple 7-chord touch-pad guitar for the Adafruit Circuit Playground Express (“CPX”). Plays C, D, E, F, G and A major chords, plus Emin. Enough for traditional 3-chord (Ⅰ, Ⅳ, Ⅴ) songs in the keys of C, D and G.
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Demo video: Circuit Playground Express Chord Guitar
Upload all the chord WAV files + main.py to your CPX. Play a chord by touching a pad:
PAD CHORD
======== ========
A1 C
A2 D
A3 E
A4 Emin
A5 F
A6 G
A7 A
The chords were made with SoX and this script:
cat guitar.txt | while read chord foo first third fifth
do
echo "$chord" :
sox -n -r 16000 -b 16 "chord-${chord}.wav" synth 1 pl "$first" pl "$third" pl "$fifth" delay 0 .05 .1 remix - fade p 0 1 0.5 norm -5 reverb
done
along with this file, guitar.txt:
G : G2 B2 D3
C : C3 E3 G4
D : D3 F#4 A3
F : F3 A3 C4
A : A3 C#4 E4
E : E2 G#3 B3
Em : E2 G3 B3
You probably won't need to remake the chords. If you do, remember that the CPX can only play 16-bit mono 16 kHz WAV files.