mirror of
https://github.com/KevinMidboe/python-gpiozero.git
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07c95598d1
Tweak the second keyboard robot recipe so it detects keyboards and doesn't throw exceptions on unknown keys. Also add a note to the recipe that it won't work over remote connections like SSH.
37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
from gpiozero import Robot
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from evdev import InputDevice, list_devices, ecodes
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robot = Robot(left=(4, 14), right=(17, 18))
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# Get the list of available input devices
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devices = [InputDevice(device) for device in list_devices()]
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# Filter out everything that's not a keyboard. Keyboards are defined as any
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# device which has keys, and which specifically has keys 1..31 (roughly Esc,
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# the numeric keys, the first row of QWERTY plus a few more) and which does
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# *not* have key 0 (reserved)
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must_have = {i for i in range(1, 32)}
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must_not_have = {0}
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devices = [
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device
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for device in devices
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for keys in (set(device.capabilities().get(ecodes.EV_KEY, [])),)
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if must_have.issubset(keys)
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and must_not_have.isdisjoint(keys)
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]
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# Pick the first keyboard
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keyboard = devices[0]
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keypress_actions = {
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ecodes.KEY_UP: robot.forward,
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ecodes.KEY_DOWN: robot.backward,
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ecodes.KEY_LEFT: robot.left,
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ecodes.KEY_RIGHT: robot.right,
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}
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for event in keyboard.read_loop():
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if event.type == ecodes.EV_KEY and event.code in keypress_actions:
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if event.value == 1: # key down
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keypress_actions[event.code]()
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if event.value == 0: # key up
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robot.stop()
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