This isn’t a USB HID keyboard, instead it uses a USB-to-serial chip and appears to the host computer as a serial device. The keys themselves are simple momentary action switches, perhaps a ...
His Morse Code USB Keyboard Mk II adds to that list. It’s a Saturday afternoon project, with a few parts slapped onto a piece of perf-board, that allows using a Morse key as a USB keyboard.
It’s called a dual-mode keyboard as you can pair it with two devices via Bluetooth, and also connect a third device using a small USB wireless transmitter that’s included with the keyboard ...