This is a fork dating from October 2021 of the original repo by nathalis, before it was removed around May 2022. By that time the README had been updated to say that this repo was deprecated in favour of a newer one, Arduino-USB-KM-Switch-3.0, which used a different hardware configuration for wireless use.
Arduino KM (Keyboard + Mouse) Switch version 2.0 is now using USB Host Shield with MAX3421E, using Arduino DUE for better performance, it has 4 Hardware Serial Bus connected with Arduino Micro (Leonardo ATMEGA32U4). The configuration is set to support 4 HID devices in 1 hub (but I recommend only one Keyboard and Mouse, not for example: 2 Keyboards with 2 Mouses, but in many cases it will work). Main software Library is UHS30 (Pre-release of USB Host Library version 3.0). It is using HID RAW readings (and if you have a mouse not working, the solution is to map raw data from the mouse in source code, because I tested only 4 mouses and each has different RAW data and sensitivity).
- ScrollLock = switching from actual device to next in loop
- ScrollLock + F1 = First HID device
- ScrollLock + F2 = Second HID device
- ScrollLock + F3 = Third HID device
- ScrollLock + F4 = Fourth HID device
Serial speed between Arduino DUE and Arduino Micro is 115200 Baud rate and 4bytes per reading.
- Arduino DUE USB host not start, try reset Arduino DUE
- Devices not connecting through hub, try connect external power 5V / 2A to Arduino DUE or USB HUB.
- if the mouse cursor position jumps, wait 3 minutes to stabilize or try to reboot the computer (it is partially software fixed, but it is a hardware problem).
- one cable keyboard of two keyboards is lagging, use only one keyboard or two cable keyboards (some wireless keyboards repeatedly sending empty data for keep connection, that could make problem with other keyboards)
- my mouse has low sensitivity, try disable debugging (bool debug = false;)
