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df581b6 May 14, 2018
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@ladyada @craigargh @tannewt @dhalbert
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# CircuitPlayground demo - Keyboard emu
import time
import board
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
from adafruit_hid.keycode import Keycode
from digitalio import DigitalInOut, Direction, Pull
# A simple neat keyboard demo in circuitpython
# The button pins we'll use, each will have an internal pullup
buttonpins = [board.D2, board.D1, board.D0]
# our array of button objects
buttons = []
# The keycode sent for each button, will be paired with a control key
buttonkeys = [Keycode.A, Keycode.B, "Hello World!\n"]
controlkey = Keycode.SHIFT
# the keyboard object!
# sleep for a bit to avoid a race condition on some systems
time.sleep(1)
kbd = Keyboard()
# we're americans :)
layout = KeyboardLayoutUS(kbd)
# make all pin objects, make them inputs w/pullups
for pin in buttonpins:
button = DigitalInOut(pin)
button.direction = Direction.INPUT
button.pull = Pull.UP
buttons.append(button)
led = DigitalInOut(board.D13)
led.direction = Direction.OUTPUT
print("Waiting for button presses")
while True:
# check each button
for button in buttons:
if not button.value: # pressed?
i = buttons.index(button)
print("Button #%d Pressed" % i)
# turn on the LED
led.value = True
while not button.value:
pass # wait for it to be released!
# type the keycode or string
k = buttonkeys[i] # get the corresp. keycode/str
if isinstance(k, str):
layout.write(k)
else:
kbd.press(controlkey, k) # press...
kbd.release_all() # release!
# turn off the LED
led.value = False
time.sleep(0.01)