4 layers38.1 × 82.5 mm
4 layers221.8 × 105.9 mm
Katori
grassfedreeve/katori1130-key wireless topre/ec hummingbird keyboard
- Size
- 221.8 × 105.9 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 98
- Nets
- 32
- Pads
- 330
- Tracks, vias
- 769, 530
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Nov 2024
- Updated
- 8 Mar 2025
Overview
Katori is an open-source printed circuit board by grassfedreeve, from the grassfedreeve/katori repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 4-layer board of 221.8 × 105.9 mm with 98 parts on 32 nets, routed with 769 tracks and 530 vias.
It is built around the TMUX1308BQBR. Its parts include 31 switches, 16 resistors, 4 capacitors, 4 ICs and 2 connectors.
Main components
1README
README.md
katori
30-key wireless topre/ec hummingbird keyboard based on the rufous & topreviung
named after katori senkō mosquito coils that inspired the original conical spring design for topre switches, as well as katori's translation to bird as homage to the hummingbird.
Status
Revision 1 has been built and tested. Had design error fixed in r2 but yet to be officially ordered
Manufacturing
Can be hand soldered or ordered assembled using assembly files
Currently setup to use a 1.2mm aluminum single layer pcb as the plate
Parts needed
- 1 pcb
- 1 plate
- 1 case
- 1 seeed xiao compatible controller
- 30 1u EC housing + slider
- 30 Rubber domes
- 30 Conical springs
- 26 m1.6 5mm full thread standoffs
- 1 3x6x5 tht reset switch
- 26 m1.6 3mm screws
- 6 m3 3mm screws
BOM
- 1 PCM12SMTR - power switch
- 7 SMTSO3020MTJ - SMD solder nut
- 2 TSSOP-16 multiplexers
- 1 0603 1k resistor
- 13 0603 100k resistors
- 3 0603 100n capacitors
- 1 0603 220pF capacitor
Optional
- Silencing rings
- 450mah 601148 battery
- 1 PCM12SMTR - power switch
PCB Renders
Inspiration & Thanks
- jcmkk3's rufous hummingbird variation, of which I used the Ergogen config and splay etc.
- pete johanson for his incredible help during the project and his topreviung keyboard, which was the basis of the schematic and entire EC portions.
- PJE66's original hummingbird keyboard
Acknowledgements
Thank you to PCBWay for sponsoring this project!
You can find and order the parts for this project on PCBWay using these links:
Parts
98| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | EC_SW | capacitive_sensors:katori_pad_1U_90deg | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +10 |
| 26 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | PH1, PH2, PH10, PH11, PH12, PH13, PH14, PH15, PH16, PH17, PH18, PH19, PH20, PH21, PH22, PH23 +10 |
| 13 | 100k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R10, R11, R12, R13, R14, R15 |
| 8 | MountingHole | katori:Bumpon | BUMP1, BUMP2, BUMP3, BUMP4, BUMP5, BUMP6, BUMP7, BUMP8 |
| 6 | MountingHole | katori:MountingHole_3mm_Pad_NonPTH_TopOnly | H1, H2, H3, H4, H5, H6 |
| 4 | EC_SW | capacitive_sensors:katori_pad_1U | SW27, SW28, SW29, SW30 |
| 3 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2, C4 |
| 2 | 74HC4051 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U2, U4 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R16 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8 |
| 1 | 220pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3 |
| 1 | DNP | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R9 |
| 1 | JST ACH | Connector_JST:JST_ACH_BM02B-ACHSS-GAN-ETF_1x02-1MP_P1.20mm_Vertical | J1 |
| 1 | OPA357AIDBVR | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | POWER | Button_Switch_SMD:SW_SPDT_PCM12 | SW31 |
| 1 | SW_PUSH | Button_Switch_THT:SW_PUSH_1P1T_6x3.5mm_H5.0_APEM_MJTP1250 | RESET1 |
| 1 | SeeeduinoXIAO_Hybrid | katori:xiao-ble-tht-cutout-topre-no-reset-outline | U1 |
| 1 | Solder | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
Questions
How big is the Katori PCB?
It measures 221.8 × 105.9 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Katori use?
98 parts, built around the TMUX1308BQBR. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Katori KiCad files?
From the grassfedreeve/katori repository on GitHub, at the commit this page was made from: the board is pcb/katori.kicad_pcb and its schematic pcb/analog.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Katori design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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