Arduino only-based adapter (no PC needed)

[Useus]

Unfortunately this project was limited in many ways by Arduino speed and flash size.

if it were able to convert to rpi pico, there would be no need even of the usb host shield and it would have a 1ms response. unfortunately I'm not able to do it, otherwise I would have done it already.

source usb host device https://github.com/sekigon-gonnoc/Pico-PIO-USB