What is SpaceFN and why you should give it a try
The SpaceFN concept - setting up your space key as a layer switch when held - is probably one of the most useful tweaks in the keyboard hobby. Let me explain how it works. My SpaceFN article on kbd.news made some rounds recently - quite surprisingly given the age of this concept. This piece you're reading is a condensed version of the full post. If you're left with unanswered questions, you'll most likely find the info you're looking for in the original write-up. On my imaginary top list of the most useful keyboard features, tweaks and hacks, SpaceFN would deserve a podium finish for sure. But what makes it so special? In short: SpaceFN is easy to implement, easy to learn, costs nothing, can be used with any keyboard, and can improve your productivity instantly. I will list its benefits below, but can state right at this point that the SpaceFN concept, setting up your space key as a layer switch when held, is clearly one of the most useful tweaks in the keyboard hobby....
Apr 30, 2024
Remind it before you purchase one.
https://www.gitbook.com/book/qmk/firmware/details
However, with power comes complexity, in both usage and setup.
There is an easier way to do it if your keyboard is supported: http://kbfirmware.com/
You just use KLE and upload your KLE raw to that site. Not sure if it works for KBD75 though, but there are several guides out there for it.
I'd rather use something QMK based than the easy to use proprietary options at this point, honestly.
Some instructions https://drive.google.com/file/d/0B9XoYZuzpjWnakdHSjJtU183cEU/view
I had more trouble flashing the firmware to my pro micro (up until I found out a workaround) than modifying a keymap, defining my own string macros that are on multiple layers, and generating the .hex file.