按键事件

    1. import keypad
    2. import time
    3. import board
    5. KEY_PINS = (
    6.     board.UP,
    7.     board.DOWN,
    8.     board.LEFT,
    9.     board.RIGHT,
    10.     board.BTNA,
    11.     board.BTNB,
    12. )
    13. keys = keypad.Keys(KEY_PINS, value_when_pressed=False, pull=True)
    15. while True:
    16.     event = keys.events.get()
    17.     if event:
    18.         if event.pressed:
    19.             print(event.key_number)

    把按键显示在屏幕上

    1. import time
    2. import board
    3. import displayio
    4. import keypad
    6. from adafruit_bitmap_font import bitmap_font
    7. from adafruit_display_text import label
    9. display = board.DISPLAY
    11. KEY_PINS = (
    12.     board.UP,
    13.     board.DOWN,
    14.     board.LEFT,
    15.     board.RIGHT,
    16.     board.BTNA,
    17.     board.BTNB,
    18. )
    19. keys = keypad.Keys(KEY_PINS, value_when_pressed=False, pull=True)
    21. text = "HELLO WORLD"
    23. font = bitmap_font.load_font("fonts/Helvetica-Bold-16.bdf")
    24. color = 0x0000FF
    26. text_area = label.Label(font, text=text, color=color)
    28. # Set the location
    29. #text_area.x = 80
    30. #text_area.y = 60
    32. # Set in center 80=160/2 60=120/2
    33. text_area.anchor_point = (0.5, 0.5)
    34. text_area.anchored_position = (80, 60)
    36. display.show(text_area)
    38. while True:
    39.     event = keys.events.get()
    40.     if event:
    41.         if event.pressed:
    42.             print(event.key_number)
    43.             if event.key_number==0:
    44.                 text_area.text="UP"
    45.             if event.key_number==1:
    46.                 text_area.text="DOWN"
    47.             if event.key_number==2:
    48.                 text_area.text="LEFT"
    49.             if event.key_number==3:
    50.                 text_area.text="RIGHT"
    51.             if event.key_number==4:
    52.                 text_area.text="button A"
    53.             if event.key_number==5:
    54.                 text_area.text="button B"
    55.     #time.sleep(0.4)
    56.     pass