Using rp2040 as a keyboard AND a mouse through micropython #17475

dov · 2025-06-10T20:31:22Z

dov
Jun 10, 2025

I'm working on writing a micropython program for the the Pico W to make it into a websocket controlled USB-keyboard and mouse. I'm using the the micropython-lib packages usb-device-keyboard and usb-device-mouse. The keyboard part now seem to be working and I wanted to add mouse support as well. But when initializing the mouse, the keyboard part stops working.

Here is how to reproduce the problem.

Install the dependent packages:

mpremote connect /dev/ttyACM0 mip install usb-device-mouse
mpremote connect /dev/ttyACM0 mip install usb-device-keyboard

Add the following to main.py:

import usb.device
from usb.device.keyboard import KeyboardInterface, KeyCode, LEDCode
from usb.device.mouse import MouseInterface
import time

time.sleep_ms(5000) # Sleep so that we can interrupt at start

kb = KeyboardInterface()
mouse = MouseInterface()
usb.device.get().init(kb, builtin_driver=True)
# usb.device.get().init(mouse, builtin_driver=True)   # <--- If I do this init, I can no longer send keyboard events!

# Send the character 'a' twice a second
while True:
    kb.send_keys([KeyCode.A])  # <--- This is only received if I don't init the mouse
    kb.send_keys([])
    time.sleep_ms(500)

Restart the MCU and wait for the incoming 'a' characters
Change main.py and uncomment the mouse initialization
Redo and verify that there are no incoming 'a' characters.

So my question is, how can I initialize both the keyboard AND the mouse?

My version of micropython is:

MicroPython v1.25.0 on 2025-04-15; Raspberry Pi Pico W with RP2040

dov · 2025-06-11T06:38:48Z

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Using rp2040 as a keyboard AND a mouse through micropython #17475

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MicroPython

Using rp2040 as a keyboard AND a mouse through micropython #17475

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dov Jun 10, 2025

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dov Jun 11, 2025 Author

dov
Jun 10, 2025

dov
Jun 11, 2025
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