A project just for fun, to see if I can type on it.
The layout:
↑ ◐ ● ◑ ↹ ⌫ ↩ ␣ ◐ ● ◑ ↓
Imagine mapping the home row ASDFG to three keys, using chords.
Let's say we only have the SDF keys, the mapping will be like this:
S = A
SD = S
D = D
DF = F
F = G
So, if you wanted to type SAD then you would press SD S D. The grouped keys becomes a chord for your ring and middle finger.
Now then, what if you wanted to type FEAST?
Notice that ↑ on the pinky? It shifts the home row up.
Before things get crazy, let's rename SDF to ◐●◑.
Now, then FEAST becomes:
F E A S T
●◑ ↑● ● ◐● ↑◑
The same applies for the ↓ on the right pinky. This shifts the home row down.
So what about the thumbs then?
The left thumb has two keys, a TAB ↹ and a BACKSPACE ⌫.
The right thumb has RETURN ↩ and SPACE ␣.
However, when held they enter other layers.
In my (still only slideware) config, I've mapped the numbers to the top row on the SPACE layer.
So, for me to type out 1337 it would be:
1 3 3 7
↑◐␣ ↑●␣ ↑●␣ ↑␣●◑
I will post my complete keymap when it's ready.
We could also realize five keys by using timing and only two keys.
A S D F G
◐ ◐-◑ ◑◐ ◑-◐ ◑
S and F has a roll, while D is at the same time (within a confurable Δt ms).
Will try to play with this as well, and thus getting the layout down to 10 keys total.