todbot · November 8, 2024 16:20 · todbot · Aug 16, 2023 · todbot · Aug 16, 2023
diff --git a/trinkey_theremin_pitch_code.py b/trinkey_theremin_pitch_code.py
 # trinkey_theremin_pitch_code.py -- Trinkey MIDI Theremin! with pitch control!
 # 2021 @todbot
 # left antenna: pitch (by multiple MIDI notes, put your synth in legato mode)
 # right antenna: filter cutoff
 # video demo in comment below
 #
 import time
 import board
 import neopixel
 import touchio
 import usb_midi
 import adafruit_midi
 from adafruit_midi.note_on          import NoteOn
 from adafruit_midi.control_change   import ControlChange

 midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0)
 leds = neopixel.NeoPixel(board.NEOPIXEL, 4, brightness=0.2, auto_write=True)

 # announce we're alive and wait for things to stabilize
 # before creating touch pins so their raw_value baseline are okay
 leds.fill(0xff00ff)
 time.sleep(1.0)
 leds.fill(0)

 touch1_pin = touchio.TouchIn(board.TOUCH1)
 touch2_pin = touchio.TouchIn(board.TOUCH2)

 # a litlte helper class for noise filtering
 class RunningAverage:
    def __init__(self,count):
        self.count = count
        self.i = 0
        self.buf = [0] * self.count
    def add_value(self,val):
        self.buf[self.i] = val
        self.i = (self.i + 1) % self.count
    def average(self):
        return sum(self.buf)/self.count

 base1 = int(touch1_pin.raw_value * 1.02)
 base2 = int(touch2_pin.raw_value * 1.02)

 avg1 = RunningAverage(8)
 avg2 = RunningAverage(8)

 note_on = False

 note_base = 48  # C3 in MIDI land
 note = note_base
 velocity = 64  # half 

 while True:
    avg1.add_value( touch1_pin.raw_value )
    avg2.add_value( touch2_pin.raw_value )

    r = 0
    g = min(max(avg1.average()-base1, 0),255)
    b = min(max(avg2.average()-base2, 0),255)
    
    leds.fill( (r,g,b) )

    if g > 10:   # hand present
        note_new = note_base + int(g/4)
        if note_new != note:
            print(time.monotonic(),"******* ON! ",note_new,note)
            midi.send(NoteOn(note_new, velocity)) # turn on new note
            midi.send(NoteOn(note,0)) # 0=off  # turn off old note
            note = note_new  # save new note

    else: # no hand, turn off note
        midi.send(NoteOn(note,0)) # 0=off
    
    if b > 10:  # hand present
        midi.send(ControlChange( 74, 16+int(b/2.5)))  # 74 = filter cutoff

    time.sleep(0.001)
	# trinkey_theremin_pitch_code.py -- Trinkey MIDI Theremin! with pitch control!
	# 2021 @todbot
	# left antenna: pitch (by multiple MIDI notes, put your synth in legato mode)
	# right antenna: filter cutoff
	# video demo in comment below
	#
	import time
	import board
	import neopixel
	import touchio
	import usb_midi
	import adafruit_midi
	from adafruit_midi.note_on import NoteOn
	from adafruit_midi.control_change import ControlChange

	midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0)
	leds = neopixel.NeoPixel(board.NEOPIXEL, 4, brightness=0.2, auto_write=True)

	# announce we're alive and wait for things to stabilize
	# before creating touch pins so their raw_value baseline are okay
	leds.fill(0xff00ff)
	time.sleep(1.0)
	leds.fill(0)

	touch1_pin = touchio.TouchIn(board.TOUCH1)
	touch2_pin = touchio.TouchIn(board.TOUCH2)

	# a litlte helper class for noise filtering
	class RunningAverage:
	def __init__(self,count):
	self.count = count
	self.i = 0
	self.buf = [0] * self.count
	def add_value(self,val):
	self.buf[self.i] = val
	self.i = (self.i + 1) % self.count
	def average(self):
	return sum(self.buf)/self.count

	base1 = int(touch1_pin.raw_value * 1.02)
	base2 = int(touch2_pin.raw_value * 1.02)

	avg1 = RunningAverage(8)
	avg2 = RunningAverage(8)

	note_on = False

	note_base = 48 # C3 in MIDI land
	note = note_base
	velocity = 64 # half

	while True:
	avg1.add_value( touch1_pin.raw_value )
	avg2.add_value( touch2_pin.raw_value )

	r = 0
	g = min(max(avg1.average()-base1, 0),255)
	b = min(max(avg2.average()-base2, 0),255)

	leds.fill( (r,g,b) )

	if g > 10: # hand present
	note_new = note_base + int(g/4)
	if note_new != note:
	print(time.monotonic(),"******* ON! ",note_new,note)
	midi.send(NoteOn(note_new, velocity)) # turn on new note
	midi.send(NoteOn(note,0)) # 0=off # turn off old note
	note = note_new # save new note

	else: # no hand, turn off note
	midi.send(NoteOn(note,0)) # 0=off

	if b > 10: # hand present
	midi.send(ControlChange( 74, 16+int(b/2.5))) # 74 = filter cutoff

	time.sleep(0.001)