CircuitPython code for volume knob

code.py

import board
from digitalio import DigitalInOut, Direction, Pull
from adafruit_hid.consumer_control import ConsumerControl
from adafruit_hid.consumer_control_code import ConsumerControlCode
import time
import usb_hid

class Button:
    """Debounced button handler. The user can assign a callback function
    to be called when the button is pressed and/or released."""

    def __init__(self, pin, on_press, on_release=None, debounce_time=0.01, normally=True):
        self.pin = DigitalInOut(pin)
        self.pin.direction = Direction.INPUT
        self.pin.pull = Pull.UP

        self.on_press = on_press
        self.on_release = on_release
        self.debounce_time = debounce_time
        self.normally = normally

        self.last_time = time.monotonic()
        self.state = normally

    def update(self):
        if self.pin.value != self.state:
            current_time = time.monotonic()
            if current_time - self.last_time >= self.debounce_time:
                self.state = self.pin.value
                self.last_time = current_time
                if (self.state != self.normally) and self.on_press:
                    self.on_press()
                elif (self.state == self.normally) and self.on_release:
                    self.on_release()

class RotaryEncoder:

    def __init__(self, clk_pin, dr_pin, on_cw, on_ccw):
        self.clk_pin = DigitalInOut(clk_pin)
        self.clk_pin.direction = Direction.INPUT
        self.clk_pin.pull = Pull.UP

        self.dr_pin = DigitalInOut(dr_pin)
        self.dr_pin.direction = Direction.INPUT
        self.dr_pin.pull = Pull.UP

        self.on_cw = on_cw
        self.on_ccw = on_ccw

        self.turning = False

    def update(self):
        if not self.turning:
            # if one of the rotary pins is high, we're turning
            if not self.clk_pin.value and self.dr_pin.value:
                self.on_cw()
                self.turning = True
            elif not self.dr_pin.value and self.clk_pin.value:
                self.on_ccw()
                self.turning = True
        else:
            if self.clk_pin.value and self.dr_pin.value:
                self.turning = False


cc = ConsumerControl(usb_hid.devices)

def mute():
    cc.press(ConsumerControlCode.MUTE)
    cc.release()

muteButton = Button(board.D2, mute)

def volume_up():
    cc.press(ConsumerControlCode.VOLUME_INCREMENT)
    cc.release()
def volume_down():
    cc.press(ConsumerControlCode.VOLUME_DECREMENT)
    cc.release()

volumeKnob = RotaryEncoder(board.D0, board.D1, volume_up, volume_down)


######################### MAIN LOOP ##############################

while True:
  volumeKnob.update()
  muteButton.update()