Create CircuitPlaygroundExpress_HIDKeyboard.py

Circuit Playground Express HID Keyboard demo

Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_HIDKeyboard.py

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+# CircuitPlaygroundExpress_HIDKeyboard
+
+from digitalio import DigitalInOut, Direction, Pull
+import touchio
+import board
+import time
+from adafruit_hid.keyboard import Keyboard
+from adafruit_hid.keycode import Keycode
+from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
+
+# A simple neat keyboard demo in circuitpython
+
+# The button pins we'll use, each will have an internal pulldown
+buttonpins = [board.BUTTON_A, board.BUTTON_B]
+# our array of button objects
+buttons = []
+# The keycode sent for each button, will be paired with a control key
+buttonkeys = [Keycode.A, "Hello World!\n"]
+controlkey = Keycode.SHIFT
+
+# the keyboard object!
+kbd = Keyboard()
+# we're americans :)
+layout = KeyboardLayoutUS(kbd)
+
+# make all pin objects, make them inputs w/pulldowns
+for pin in buttonpins:
+    button = DigitalInOut(pin)
+    button.direction = Direction.INPUT
+    button.pull = Pull.DOWN
+    buttons.append(button)
+
+led = DigitalInOut(board.D13)
+led.direction = Direction.OUTPUT
+
+print("Waiting for button presses")
+
+while True:
+    # check each button
+    # when pressed, the LED will light up,
+    # when released, the keycode or string will be sent
+    # this prevents rapid-fire repeats!
+    for button in buttons:
+        if  button.value:   # pressed?
+            i = buttons.index(button)
+            print("Button #%d Pressed" % i)
+
+            # turn on the LED
+            led.value = True
+
+            while  button.value:
+                pass  # wait for it to be released!
+            # type the keycode or string
+            k = buttonkeys[i]    # get the corresp. keycode/str
+            if type(k) is 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)