Keyboard Builders' Digest / Projects
Leptosis
The Leptosis by Cheyao is a 7.5 mm ultra-low profile wireless split keyboard with PG1316 switches.
Published September 10, 2025
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Cheyao aka cyao12 open sourced this ultra-low profile split, the wireless Leptosis. The board features Kailh PG1316 switches, on-board nrf52 MCUs, and runs ZMK.
Lately I had some spare time on my hands, and I built my own super flat PG1316 bluetooth keyboard! […] "Leptos" stands for "flat" in greek, added with the suffix is, it forms the word "Leptosis", signifying the most flat. This represents my long lasting desire for a real flat keyboard that is portable and light – cyao12.
The device is very compact: 7.5 mm height, with a 13x9cm footprint per half.
- 36 keys (5x3+3)
- Kailh PG1316 switches, soldered
- Embedded nrf52 MCU
- Height: 7.5 mm
- Dimensions: 13.2x9.2 cm
- Custom battery management and optimization
- Battery life about 4 months for central and 1 year for peripheral
- ZMK Bluetooth
Resources
Published on Wed 10th Sep 2025. Featured in KBD #198 (source).
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