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
After that, it's all software. The magnetic connector has power and ground, the two wires of an I2C bus, and one sense wire. The sense wire is pulled to ground in the keyboard. When the future number pad is attached, the number pad will pull the sense wire high. I need to make the software skip the I2C communications when the sense line is low.
Considering how new I am to programmnig in C, I'll take any advice given. Last time I actually did any real programming, it was on a TI-89 and a Commodore 128. O_o