Willis
About the Willis PCB
Willis is an open source PCB design by krikun98, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 188.9 × 83.9 mm, with 84 components from 21 distinct parts.
Other key parts include the TP4054 and E73-2G4M08S1C-52840. By type, the board carries 38 diodes, 21 relays, 4 connectors, 4 capacitors, 4 resistors and 2 ICs.
It belongs with the keyboards and iot & wireless designs in this gallery.
From the project
Wireless PCB for Bruce the Keyboard
The Willis is a wireless ZMK PCB for whydobearsxplod and jlw's Bruce the Keyboard.
It is licensed under the permissive CERN-OHL-P v2.
Wireless with a built-in E73 module ZMK support via a module Fuses and ESD protection High Voltage mode for the best power efficiency Soldered MX 34- or 36-key layouts Meant for 431575 450 mAh battery in the PCB hole Externally accessible softoff and reset buttons Math-generated silkscreen Is a keyboard * Very much is not a human.
Main components on the Willis
Willis bill of materials (BOM)
84 components, 21 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TP4054 | SOT-23-5_HandSoldering | U1 |
| 1 | E73-2G4M08S1C-52840 | E73-2G4M08S1C-52840 | U3 |
| 1 | AO3407 | SOT-23_Handsoldering | Q1 |
| 1 | 32.768kHz | Crystal_SMD_MicroCrystal_CM9V-T1A-2Pin_1.6x1.0mm_HandSoldering | X1 |
| 1 | SWD | connector_swd_REV | J1 |
| 1 | Battery | Battery_TH | J2 |
| 1 | Battery JST | JST_SH_SM02B-SRSS-TB_1x02-1MP_P1.00mm_Horizontal | J4 |
| 1 | TC2030_SWD | CON_TC2030_outlined | J5 |
| 4 | MountingHole | M2_Hole_TH_mod | H1, H2, H3, H4 |
| 21 | KEYSW | SW_MX_1u | K1, K3, K8, K9, K10, K13, K14, K17 +13 |
| 2 | SW_PUSH | SW_SPST_EVQP7C | RSW1, RSW2 |
| 2 | Stabilizer | STAB_MX_P_2u | S1, S2 |
| 36 | D_Small | D_SOD-323_HandSoldering | D1, D2, D3, D4, D5, D6, D7, D8 +28 |
| 1 | RED | LED_1206_3216Metric_ReverseMount_Hole1.8x2.4mm | D39 |
| 1 | 1N5819 | D_SOD-323_HandSoldering | D40 |
| 1 | 10uH | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | L3 |
| 2 | 12pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C4 |
| 2 | 4.7uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C5 |
| 2 | 1K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R6 |
| 1 | 3K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 100K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7 |
Willis design files
The KiCad project lives in the krikun98/Willis repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/willis.kicad_pcb
- Schematicpcb/willis.kicad_sch
Willis: common questions
How big is the Willis PCB?
The Willis measures 188.9 × 83.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Willis?
84 components, from 21 distinct parts. The full bill of materials is listed on this page.
Where can I download the Willis design files?
From the krikun98/Willis repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Willis design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which krikun98 chose for the repository.
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