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driver40

An ultraportable 4x5 ortholinear split keyboard

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I like split keyboards, and needed a portable keyboard to carry with me on a day-to-day basis. I looked around for a little while, and found nothing that caught my eye, so I decided to make my own. Although it would take more effort than just getting an off the shelf keyboard, I have previously done similar things, and I figured it'd be worth it since I could fine-tune it to my liking.

I set forth a few things I wanted out of a keyboard, and got sketching. You can see the whole process in the more in-depth write-up found at my website.

Driver40 is what I ended up with. I also implemented a few other nifty features and turned them into their own variations of the primary build, which you can see above.

Specs

  • 4x5 ortholinear layout
  • powered by an nrf52840 pro micro
  • 300mah battery capacity
  • ~36h (estimated) of battery life
  • null, single or dual integrated pointer devices
  • custom keycaps (4, to be precise)
  • BT & wired connectivity
  • snap-on magnetic backplates for better portability
  • additional 3d printable travel cover

Roadmap

Want to build a Driver40? Here's how:

  1. Choose your preferred variant.

  2. Get all the parts required for the build.

  3. Follow the build guide.

  4. Done!

License

© typewatch 2026. Some rights reserved.

This work is licensed under the Creative Commons CC-BY-NC-SA License.

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