CircuitPython helper library for simulating HID devices.
Project description
Introduction
This driver simulates USB HID devices. Currently keyboard and mouse are implemented.
Dependencies
This driver depends on:
Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.
Additional Layouts
This library has an en-US layout. Please check out and expand the library from Neradoc for additional layouts.
Usage Example
The Keyboard class sends keypress reports for a USB keyboard device to the host.
The Keycode class defines USB HID keycodes to send using Keyboard.
import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keycode import Keycode
# Set up a keyboard device.
kbd = Keyboard(usb_hid.devices)
# Type lowercase 'a'. Presses the 'a' key and releases it.
kbd.send(Keycode.A)
# Type capital 'A'.
kbd.send(Keycode.SHIFT, Keycode.A)
# Type control-x.
kbd.send(Keycode.CONTROL, Keycode.X)
# You can also control press and release actions separately.
kbd.press(Keycode.CONTROL, Keycode.X)
kbd.release_all()
# Press and hold the shifted '1' key to get '!' (exclamation mark).
kbd.press(Keycode.SHIFT, Keycode.ONE)
# Release the ONE key and send another report.
kbd.release(Keycode.ONE)
# Press shifted '2' to get '@'.
kbd.press(Keycode.TWO)
# Release all keys.
kbd.release_all()The KeyboardLayoutUS sends ASCII characters using keypresses. It assumes the host is set to accept keypresses from a US keyboard.
If the host is expecting a non-US keyboard, the character to key mapping provided by KeyboardLayoutUS will not always be correct. Different keypresses will be needed in some cases. For instance, to type an 'A' on a French keyboard (AZERTY instead of QWERTY), Keycode.Q should be pressed.
Currently this package provides only KeyboardLayoutUS. More KeyboardLayout classes could be added to handle non-US keyboards and the different input methods provided by various operating systems.
import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
kbd = Keyboard(usb_hid.devices)
layout = KeyboardLayoutUS(kbd)
# Type 'abc' followed by Enter (a newline).
layout.write('abc\n')
# Get the keycodes needed to type a '$'.
# The method will return (Keycode.SHIFT, Keycode.FOUR).
keycodes = layout.keycodes('$')The Mouse class simulates a three-button mouse with a scroll wheel.
import usb_hid
from adafruit_hid.mouse import Mouse
m = Mouse(usb_hid.devices)
# Click the left mouse button.
m.click(Mouse.LEFT_BUTTON)
# Move the mouse diagonally to the upper left.
m.move(-100, -100, 0)
# Roll the mouse wheel away from the user one unit.
# Amount scrolled depends on the host.
m.move(0, 0, -1)
# Keyword arguments may also be used. Omitted arguments default to 0.
m.move(x=-100, y=-100)
m.move(wheel=-1)
# Move the mouse while holding down the left button. (click-drag).
m.press(Mouse.LEFT_BUTTON)
m.move(x=50, y=20)
m.release_all() # or m.release(Mouse.LEFT_BUTTON)The ConsumerControl class emulates consumer control devices such as remote controls, or the multimedia keys on certain keyboards.
import usb_hid
from adafruit_hid.consumer_control import ConsumerControl
from adafruit_hid.consumer_control_code import ConsumerControlCode
cc = ConsumerControl(usb_hid.devices)
# Raise volume.
cc.send(ConsumerControlCode.VOLUME_INCREMENT)
# Pause or resume playback.
cc.send(ConsumerControlCode.PLAY_PAUSE)Contributing
Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.
Documentation
For information on building library documentation, please check out this guide.
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