Bitlocker PIN dongle based on Raspberry Pi Pico running CircuitPython firmware

boot.py

import board
import digitalio
import time
import storage

storage.disable_usb_drive()

led = digitalio.DigitalInOut(board.LED)
led.direction = digitalio.Direction.OUTPUT

led.value = True
time.sleep(0.2)
led.value = False

code.py

import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keycode import Keycode
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS

import board
import digitalio
import time

led = digitalio.DigitalInOut(board.LED)
led.direction = digitalio.Direction.OUTPUT

while True:
    try:
        kbd = Keyboard(usb_hid.devices)
        kbd_layout = KeyboardLayoutUS(kbd)
        for x in range(3):
            time.sleep(3)
            led.value = True
            time.sleep(0.1)
            led.value = False
            if kbd.led_on(Keyboard.LED_NUM_LOCK):
                kbd_layout.write("\b\b\b\b\b\b\b\b12345678\n")
    except:
        for x in range(3):
            time.sleep(0.4)
            led.value = True
            time.sleep(0.1)
            led.value = False

    time.sleep(20)