QMK numpad hack for TKL keyboards

Problem

TKL keyboard (“tenkeyless”) means there is no numpad.

Sometimes you want a numpad, so it would be great if there was a hack to get one.

Solution

QMK makes this easy.

I made Scroll lock a key that activates the temporary numpad layer, and for good measure I made the numpad light up blue.

These are the keys in the numpad layer:

I arranged the keys as close as possible to how they are in a “numpad-ful” keyboard.

(Holding Scroll lock disables the layer)

Demonstration

Here’s me entering 123.4560:

Code

See my example code here