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Re gret

rschenk·re-gret·pcb/regret.kicad_pcb

Re gret PCB layout, top view — open source Nordic nRF board by rschenk
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About the Re gret PCB

Re gret is an open source Nordic nRF PCB design by rschenk, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 228.1 × 103.5 mm, with 119 components from 9 distinct parts.

Its main chip is the xiao-ble, from the Nordic nRF family. By type, the board carries 35 diodes, 34 switches, 12 LEDs, 1 IC and 1 transformer.

It belongs with the keyboards and iot & wireless designs in this gallery.

From the project

34 key choc hotswap keyboard, wireless

The Re-gret is a 34 key remix of my Egret keyboard.

Featuring: 34 keys, Choc spacing, Choc v1 hot swappable, Seeed Xiao MCU, wireless compatible, RGB undeglow when plugged in, and a silicone gasket sandwich stackup.

Compared to the original Egret, besides having two thumb buttons per side, the Re-gret has a more angle between the halves, and the ring and pinky fingers have more stagger and more splay. It also has a Xiao MCU which is cheaper and cuter than a Nice Nano. Certainly a more re-fined re-mix that I have no re-grets about making.

Re gret, from the project README
From the project README

Re gret bill of materials (BOM)

119 components, 9 distinct parts.

QtyPartRefs
1
—
MCU1
1
74HC595
19.051
1
—
B1
34
—
S1, S2, S3, S4, S5, S6, S7, S8 +26
34
—
SB1, SB2, SB3, SB4, SB5, SB6, SB7, SB8 +26
1
—
T1
1
—
JST1
11
VAL**
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +3
35
—
D1, D2, D3, D4, D5, D6, D7, D8 +27

Re gret design files

The KiCad project lives in the rschenk/re-gret repository on GitHub; these links point at the commit this page was built from.

Re gret: common questions

What microcontroller does the Re gret use?

The Re gret is built around the xiao-ble, from the Nordic nRF family.

How big is the Re gret PCB?

The Re gret measures 228.1 × 103.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Re gret?

119 components, from 9 distinct parts. The full bill of materials is listed on this page.

Where can I download the Re gret design files?

From the rschenk/re-gret repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Re gret design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which rschenk chose for the repository.

Can I test firmware for the Re gret without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.

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