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
Edit: oh sorry, I thought you were talking about the varmilo electronics. Regarding Adafruit module (https://www.adafruit.com/products/2829) - it seems fine (3.3v, built-in HID profile, 20 GPIO pins - enough for 10x10 array, 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging for $29.95, you will spend about the same trying to put together separate modules). Plus, unlike VB87M it could work via USB interface (VB87M is Bluetooth only, USB is just for charging).