For a <> onboard computer (Dakar type truck), I use a matrix keyboard glued on the dashboard to control GPS, sound, data monitoring (via Processing), emergency broadcast (GSM shield). This keyboard controls the PC via an Arduino Micro.
This excellent tutorial provides me control of the sound.
I’d like to emulate other functions such as screen brightness or sleep mode.
ASCII codes won’t send this orders through the HID emulated keyboard.
Is there any modification on HID or USBapi files to add more <> keys?
Thanks a lot.
PS: The computer is an Acer 3680 fanless with SSD, turn into tablet with a thick plexiglass screen (touchscreen would break within hours under the Sahara heat + vibrations).