import time # Import SPI library (for hardware SPI) and MCP3008 library.import Adafruit_GPIO.SPI as SPIimport Adafruit_MCP3008import fluidsynth fs = fluidsynth.Synth()fs.start(driver="alsa")sfid0 = fs.sfload("Audio - Sound Font - Sonic Implants Session Drums.sf2")fs.program_select(0, sfid0, 0, 0) # Hardware SPI configuration:SPI_PORT = 0SPI_DEVICE = 0mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE)) # channel state and settingsMIDI_NOTES = [48, 38, 51, 50, 55, 49, 50, 51];NUMBER_OF_CHANNELS = 6MILLIS_BETWEEN_PICKS_AND_OFF = 50MILLIS_BETWEEN_TWO_OF_THE_SAME_NOTE = 10 channel_state = [0]*NUMBER_OF_CHANNELSchannel_pick = [0]*NUMBER_OF_CHANNELSchannel_pick_time = [0]*NUMBER_OF_CHANNELSchannel_thrushhold = [30, 30, 30, 20, 60, 30, 30, 30]channel_state_millis = [0]*NUMBER_OF_CHANNELS #millis = int(round(time.time() * 1000))# Main program loop.while True: # Read all the ADC channel values in a list. values = [0]*NUMBER_OF_CHANNELS for i in range(NUMBER_OF_CHANNELS): # The read_adc function will get the value of the specified channel (0-7). values[i] = mcp.read_adc(i) #Stat 0 - IDLE if channel_state[i] == 0: #if we cross the threshhold if values[i] > channel_thrushhold[i] and channel_state_millis[i] + MILLIS_BETWEEN_TWO_OF_THE_SAME_NOTE <= int(round(time.time() * 1000)) : #set state to 1 channel_state[i] = 1 channel_state_millis[i] = int(round(time.time() * 1000)) elif channel_state[i] == 1: # while till we over the pick if channel_pick[i] < values[i]: #play note fs.noteon(0, MIDI_NOTES[i] , 127) #set state to 2 channel_state[i] = 2 channel_state_millis[i] = int(round(time.time() * 1000)) else: # save last pick channel_pick[i] = values[i] elif channel_state[i] == 2: #if the note is playing for long enough if channel_state_millis[i] + MILLIS_BETWEEN_PICKS_AND_OFF <= int(round(time.time() * 1000)): #note off fs.noteoff(0, MIDI_NOTES[i]) #clear the pick channel_pick[i] = 0 #set state back to IDLE channel_state[i] = 0 channel_state_millis[i] = int(round(time.time() * 1000))
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