cap-touch-dj.py

cap-touch-dj.py

# Uses adafruit_mpr121, an Adalogger Cowbell, PCM5102 DAC, & PAM8302 AMP
import board, busio, sdcardio, storage, os, time, digitalio, adafruit_mpr121
import audiomixer, audiocore, audiobusio # use this instead of audiopwmio
from audiocore import WaveFile

touch_pad = adafruit_mpr121.MPR121(board.STEMMA_I2C())

# Create an I2S audio output w/our pins
audio = audiobusio.I2SOut(
   bit_clock=board.GP10,
   word_select=board.GP9,
   data=board.GP11
)

# SPI SD_CS pin for SD card on Adalogger Cowbell
SD_CS = board.GP17

#  SPI0 setup for SD card
spi0 = busio.SPI(board.GP18, board.GP19, board.GP16)
sdcard = sdcardio.SDCard(spi0, SD_CS)
vfs = storage.VfsFat(sdcard)

try:
    storage.mount(vfs, "/sd")
    print("😎 sd card mounted")
except ValueError:
    print("❌ no SD card")

    # Setup path & filenames
path = "/sd/beats_22k/"

beats = ["amen6.wav",
         "amen7.wav",
         "drum_cowbell.wav",
         "drum_loop.wav",
         "duck-scratch.wav",
         "freakie-freak.wav",
         "hi_guitar.wav",
         "low_guitar.wav",
         "ohohoh2.wav",
         "snappy_beats.wav",
         "watch-this.wav",
         "yo.wav"]
# Should be 12 voices
num_voices = len(beats)

# Create Mixer and attach to audio playback
# IMPORTANT: most wave sounds are sampled at sample_rate=22050.
# If you change .wav quality (e.g. kHz setting in Audacity), make sure you adjust the sample rate for any new sample rate.
mixer = audiomixer.Mixer(voice_count=num_voices, sample_rate=22050, channel_count=1, bits_per_sample=16, samples_signed=True)
audio.play(mixer)

# read in all beats & simultaneously play them at audio sound .level = 0 (no volume)
for i in range(len(beats)):
    print(f"Reading: {beats[i]}")
    wave = WaveFile(open(path+beats[i],"rb"))
    mixer.voice[i].play(wave, loop=True )
    mixer.voice[i].level = 0.0
    time.sleep(0.05)  # short pause usually needed

print("Now playing DJ board")
while True: 
    for i in range(len(beats)):
        if touch_pad[i].value:
            mixer.voice[i].level = 1.0 # When touched, increase to full volume
        else:
            mixer.voice[i].level = 0.0 # No touch, then set volume back to zero