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February 28, 2021 00:00
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Gt-Py Knob midi control
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| # qtpy-knob-midi.py -- Mount a rotary encoder directly to an Adafruit QT Py, | |
| # use it for midi CC message | |
| # | |
| # 2020 @todbot / Tod Kurt | |
| # 2021 @David.Glaude / David Glaude | |
| import time | |
| import board | |
| from digitalio import DigitalInOut, Direction, Pull | |
| import rotaryio | |
| import usb_midi | |
| import adafruit_midi | |
| from adafruit_midi.control_change import ControlChange | |
| midi = adafruit_midi.MIDI(midi_out=usb_midi.ports[1], out_channel=0) | |
| # button of rotary encoder | |
| button = DigitalInOut(board.MOSI) | |
| button.pull = Pull.UP | |
| # Use pin A2 as a fake ground for the rotary encoder | |
| fakegnd = DigitalInOut(board.A2) | |
| fakegnd.direction = Direction.OUTPUT | |
| fakegnd.value = False | |
| encoder = rotaryio.IncrementalEncoder(board.A3, board.A1) | |
| last_encoder_val = encoder.position | |
| oldval = 63 | |
| newval = oldval | |
| oldbut = button.value | |
| newbut = oldbut | |
| while True: | |
| diff = last_encoder_val - encoder.position # encoder clicks since last read | |
| last_encoder_val = encoder.position | |
| if diff != 0: | |
| newval=oldval+diff | |
| if newval > 127: | |
| newval = 127 | |
| if newval < 0: | |
| newval = 0 | |
| newbut = button.value | |
| if oldbut != newbut: # button pressed | |
| if newbut: | |
| button_midi = ControlChange(2, 0) | |
| else: | |
| button_midi = ControlChange(2, 127) | |
| midi.send(button_midi) # sending CC message | |
| #### print("button:", newbut) | |
| oldbut = newbut | |
| else: # not pressed | |
| if oldval != newval: | |
| oldval = newval | |
| modWheel = ControlChange(1, newval) | |
| midi.send(modWheel) # sending CC message | |
| #### print("new:", newval) | |
| time.sleep(0.05) |
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Based on https://github.com/todbot/qtpy-knob
and on http://little-scale.blogspot.com/2016/07/simple-midi-rotary-encoder-with-teensy.html for possible midi CC value to use.
Alternate midi version by @todbot: https://github.com/todbot/qtpy-knob/blob/main/qtpy_knob_midi_cc.py