Demonstrate rotaryio sending USB keyboard events in CircuitPython on RaspberryPiPico

rotaryio_demo_usb_keyboard_code.py

# wire a rotary encoder to GP2,GP3, and encoder switch to GP4, with commons going to Gnd
import board
import rotaryio
import keypad
import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keycode import Keycode

CLK_PIN = board.GP4
DT_PIN = board.GP3
SW_PIN = board.GP2

keyboard = Keyboard(usb_hid.devices)

encoder = rotaryio.IncrementalEncoder(CLK_PIN, DT_PIN) # must be consecutive on Pico
encoder_button = keypad.Keys(pins=(SW_PIN,), value_when_pressed=False)

last_position = encoder.position

def left():
    print("left")
    keyboard.send(Keycode.D)

def right():
    print("right")
    keyboard.send(Keycode.A)

while True:
    pos = encoder.position
    if pos > last_position:
        left()
    if pos < last_position:
        right()
    last_position = pos

    if button := encoder_button.events.get():
        if button.pressed:
            print("pressed!")
        if button.released:
            print("released!")