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The goal is to build a keyboard filter — something that sits in between the keyboard and the main computer, and provides macro capabilities.

There's also the goal of building a USB Rubber Ducky, but that's for another day, for more malicious purposes. The keyboard-filter is useful for benign purposes of macros. It could also be used as a keylogger, but again, this page is for more benign goals.

Keyboards that have macro programming built-in

These macros must be BUILT-IN via firmware, inside the keyboard, since many of the computing environments I work in don't allow installing ANY software, which excludes nice options like AutoHotkey. The upside to this is that they work in any OS, not just Windows or MacOS.

Arduino

Raspberry Pi