Toilet paper roll chorded keyboard concept

TL;DR: Here’s a non-functioning concept of a handheld chorded keyboard.

concept of keyboard

Recently I’ve been interested in chorded keyboards. Well, interested might be an understatement, it’s more like consumed. I tried a TapStrap v1, which unfortunately didn’t live up to my expectations. The main problem was the thing everyone fears about this product, the accuracy of recognising the taps. This led me to look at other options that use physical keys like the BAT Keyboard or the wonderful things the maker community comes up with.

I like the feature of the TapStrap where you don’t need a table to use it. Any surface should be suitable. In my experience, that’s not how it works in reality, but I love the concept.

I have a BlueMicro 4x4 macropad on the way and as I already have a QMK based keyboard, I don’t need another keyboard or a macropad. Why order it you ask? N+1 keyboards is why 😁. Being Bluetooth gives me hope it’ll make a good base for a wireless chorded keyboard, just like what we’re talking about here.

These are the requirements I have for a chorded keyboard:

You’ve already seen it at the top of this post because everybody knows if you don’t start a blog post with an image, even an unrelated one, then nobody will hang around for the words. I’ll just pretend you haven’t already seen it, so… Introducing a concept to satisfy the requirements. We’re sparing no expense and making it from a toilet paper roll:

A cylinder doesn’t feel like exactly the right shape, but it’s close enough. This key layout lets your hand sit in essentially the static, relaxed position so it feels pretty good.

I’d like to get a third key under the thumb. From my other experiments with keyboards, I’ve found that having three thumb keys side-by-side is a bit too much for me. Instead, I’ve found I quite like having a low profile switch (Kailh Choc style) in front of a full height switch (Cherry MX style). I’m fairly confident I can make it work, but it’ll need testing to confirm.

I’ve gone with a slight columnar stagger for the finger keys. I’m a believer that fingers of different lengths are happy with staggered keys. Ignore the letters on the keys, they’re just what I had lying around. I think I’ll try to stand on the shoulders of giants and try out the mapping that the BAT Keyboard uses:

…or, as /u/qpockets pointed out the layout is gaining momentum. I’m keen to try the artsey layout but at this point I feel like having a strap to hold the ‘board to your hand so you can use the thumb for a few extra keys will be a winning strategy.

I’m right handed so I’ve been making it to suit, but I’ve found that if you turn it upside down, it will fit the left hand because the stagger of the finger keys goes the other way. Yes, the thumb keys are at the wrong end but if the thumb keys were mirrored at both ends, it should work as an ambidextrous keyboard.

The toilet paper roll is not up to any kind of serious use so the next version will probably be made from a plastic drink bottle. More rigidity but still easy to cut up with a knife.

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