Imported from GitHub: taciturnaxolotl/thyme · commit 63afdd9 · license MIT

Description

my custom split keyboard 🫶

README

The thyme keyboard

[!NOTE] If you want to build this yourself then go grab the files from the latest release!

BOM

Part	Quantity	Price	Link	Description	Notes
PCB	1	$15.70	JLCPCB	2-layer, 1.6mm, black, leaded Hasl	I wanted to get ENIG but that bumped the price by $20
Total $15.70 + $13.04 shipping
Choc v1 switches	50	$25.00	Chosfox	pink variant: 20+-5 gf linear	$0.50 per switch
Choc PG1350	50	$7.25	Chosfox	hot swap sockets	$0.145 per socket
1u keycaps	40	$14.00	Chosfox	White PBT low profile	$0.35 per keycap
1u homing keycaps	2	$0.80	Chosfox	White PBT low profile	$0.40 per keycap
1.5u keycaps	2	$1.65	Chosfox	White PBT low profile	$0.83 per keycap
Total cost: $48.70 + $8 shipping				average of $0.37 per keycap
SuperMini NRF52840 (Nice!Nano footprint)	2	$8.08	AliExpress	Wireless Microcontroller	$4.04 per MCU
301230 3.7V 110mAh LiPo Battery	2	$7.50	AliExpress	the non jst ones are cheaper but the crimper is 60 bucks and there is no way im buying that	$3.75 per battery
Diodes	42	$0.99	Aliexpress	1N4148	$0.01 per diode
Machine Pins	1	$0.99	AliExpress	26x2 needed to socket the two MCUs	comes in a 100 pack of 4 per header
Total cost: $14.10 + $6.52 shipping
Power Switch	4	$0.39	DigiKey	added an extra switch for each side as backup	$0.10 per switch
JST PH 2.0mm 2-pin Connector	4	$0.40	DigiKey		$0.10 per connector
Total cost: $1.96 + $8.15 tarrif/sales tax/shipping	i cant find good matches for these on ali and shipping is ridiculous rn as well
Machine Sockets 2.54mm	1	$7.35	Amazon	26x2 needed to socket the two MCUs	comes in a 10 pack of 40x1 rows

Total cost: $123.52

Shipping / Tax / Tariffs / Per store shopping list

Store	Shipping	Subtotal	Total	Items
AliExpress	$6.52	$14.20	$20.62	2x SuperMini NRF52840, Machine Pins, 2x LiPo Battery, 42x diodes
DigiKey	$8.15 (tarrifs and tax too)	$1.96	$10.11	4x Power Switch, 4x JST Connector
Chosfox	$8	$48.70	$56.70	50x Choc v1 switches, 40x 1u keycaps, 2x 1u homing keycaps, 2x 1.5u keycaps
JLCPCB	$13.04	$15.70	$28.74	1x PCB
Amazon	$0	7.35	$7.35	machine sockets

Schematics

Build Notes

Panelization is the most annoying bit of this whole process. I was able to finally get it work work by using kikit to generate rails and tabs.

kikit panelize \
    --layout 'grid; rows: 1; cols: 1; space: 3mm;' \
    --tabs 'fixed; width: 3mm; vcount: 8;' \
    --cuts 'mousebites; drill: 0.5mm; spacing: 1mm; offset: 0.2mm; prolong: 0.5mm;' \
    --framing 'railstb; width: 5mm; space: 3mm; chamfer: 1mm;' \
    --tooling '3hole; hoffset: 2.5mm; voffset: 2.5mm; size: 1.5mm;' \
    --fiducials '3fid; hoffset: 5mm; voffset: 2.5mm; coppersize: 2mm; opening: 1mm;' \
    --post 'millradius: 1mm;' \
    --text 'simple; text: "THYME v1.14"; anchor: mt; voffset: 2mm;' \
    --text2 'simple; text: Created on {date} JLC Order: JLCJLCJLC; anchor: mb; voffset: -2.5mm; hjustify: center; vjustify: center;' \
    thyme.kicad_pcb panelization/panelized.kicad_pcb

Firmware is zmk and is maintained in the submodule /zmk. The latest firmware build can be grabbed from nightly.link/taciturnaxolotl/thyme-module/workflows/build as a zip containing the left and right half uf2 files.

The case was made in onshape and is available in this document. The case is made of PLA and printed on an A1 mini. It is likely to change quite a bit once I get my pcb assembled and can fit test stuff. Evenentually I would like to add a top plate that attaches to the bottom with magnets and mill the whole case out of aluminum.

A major tool that helped with the research and organization of my thoughts was my figjam board! I used it to keep track of all the resources I found and what parts I wanted to use. Once I got to actually picking specific parts I moved that to the bom table above.