2 layers63.2 × 85 mm
Badge blob
HeyPCB/badge-blob
Blob, the social battery badge: The name badge that tells people whether to come say hi. KiCad 10, heypcb.ai merch.
18 partsCERN-OHL-S-2.0
2 layers40 × 96.1 mm
Cable bunny
HeyPCB/cable-bunnyCable Bunny: Is it a charge-only cable? Ask the bunny. KiCad 10, heypcb.ai merch.
- Size
- 40 × 96.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 23
- Pads
- 93
- Tracks, vias
- 244, 27
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 5 Oct 2026
- Updated
- 5 Oct 2026
Overview
Cable bunny is an open-source printed circuit board by HeyPCB, from the HeyPCB/cable-bunny repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 40 × 96.1 mm with 25 parts on 23 nets, routed with 244 tracks and 27 vias.
It is built around the CL21A106KAYNNNE, B5819W and 3034TR, with the KT-0603R, TS-1187A-B-A-B and TYPE-C-31-M-12 among its other parts. Its parts include 12 resistors, 8 diodes, 2 connectors, 1 capacitor and 1 switch.
Main components
7
CL21A106KAYNNNE
080510uF 25V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
B5819W
SOD-123-55℃~+125℃ 1.5A 1mA@40V 25A 40V 600mV@1A Standalone SOD-123 Schottky Diodes ROHSMDDSchottky Diodes
3034TR
-- Battery Snap ROHSKeystone ElectronicsBatteryConnector
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
TS-1187A-B-A-B
SMD-4P,5.1x5.1mm-30℃~+85℃ 1.5mm 1.6N 100,000 cycles 12V 5.1mm 5.1mm 50mA Gold No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.1x5.1mm Tactile Switches ROHSXKB ConnectionTactile Switches
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB ConnectorsKT-0603Y
0603-40℃~+85℃ 120° 175mcd 2.4V 40mW 584nm~594nm 596nm Discrete Diode Water Clear Yellow 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
README
README.mdCable Bunny
Is it a charge-only cable? Ask the bunny.
Cable Bunny is a passive USB-C cable tester shaped like a bunny. Plug both ends of a cable into the two USB-C receptacles that are its feet and press its nose: a CR2032 drives every line of the first receptacle, and every line that reaches the second one lights its own LED in the bunny's ears, VBUS, GND and CC in the left ear and D+, D- and SBU in the right. A heart LED says the cell is good. There is no MCU and no firmware.
| Layers | Size | Parts | Nets | Connections routed | Vias | ERC errors | DRC errors / unconnected / parity | BOM @100 |
|---|---|---|---|---|---|---|---|---|
| 2 | 40.1 x 96.2 mm | 25 | 22 | 58 -> 0 open | 27 | 0 | 0 / 0 / 0 | $0.95 |
Not fabricated, assembled or powered yet. Every number on this page is measured by KiCad 10.0.6 on
the files in this repository (report.json, measured.json) or read
from the live JLC/LCSC catalogue (bom_cost.json).
| Spec, power budget, BOM | SPEC.md |
| Store copy | STORE_COPY.md |
| KiCad 10 project | kicad/ |
| Gerbers, drill, BOM, CPL, STEP, schematic PDF | fab/ |
| Firmware | none: no MCU on this board |
| Renders | front, back, hero, Circuit World thumbnail |
| Brief and generator | design/ |
What's on it
- Source foot (J1): every line (VBUS, CC, D+, D-, SBU) driven from the test rail through its own 150 Ω, both rows of the receptacle joined so either plug orientation works.
- Far foot (J2): each arriving line lights its own 0603 LED through 220 Ω to the far receptacle's ground, which reaches the cell only through the cable's ground wire; the GND LED (330 Ω from the rail) proves that wire. The far shell is not connected.
- Nose: a TS-1187A button that connects the cell only while pressed, through a B5819W Schottky that stops a powered cable from back-feeding the lithium cell.
- Heart: a red LED on the test rail: if the heart lights and an ear LED doesn't, that wire is broken.
- Power: one CR2032 in a Keystone 3034 holder, about 12,000 three-second tests (SPEC.md).
Finish
White solder mask, Black silkscreen, ENIG copper finish, 1.6 mm FR4, top-side SMT assembly (J1, J2: an SMD part whose shell legs go through plated holes, soldered on the same SMT line). The gold art is bare copper under a mask opening (ENIG), drawn with its own keep-out so no track runs under it. The QR code on the back opens https://heypcb.ai/world/b/e8dc1e4d9cfb.
How it was made
Designed with the HeyPCB method on KiCad 10.0.6, headless, by the heypcb-kicad pipeline: a written
brief composed from reusable circuit blocks, every pin from KiCad's own symbol library, every part bound
to an LCSC number from a dated catalogue read, then ERC, a netlist round trip, locked placement,
Freerouting 2.4.1, pours, silkscreen and board art, DRC with schematic parity, DFM and a fab gate,
each stage gated by a measurement. design/make_brief.py regenerates the brief (outline, part
locks and art) from code.
Part of the heypcb.ai merch collection.
License
Hardware: CERN-OHL-S v2. KiCad's symbol, footprint and 3D libraries used in the design are CC-BY-SA 4.0 with the KiCad library exception.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 150 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5 |
| 5 | 220 | Resistor_SMD:R_0603_1608Metric | R6, R7, R8, R9, R10 |
| 2 | 330 | Resistor_SMD:R_0603_1608Metric | R11, R12 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | B5819W | Diode_SMD:D_SOD-123 | D1 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | D8 |
| 1 | Red (CC) | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | Red (GND) | LED_SMD:LED_0603_1608Metric | D7 |
| 1 | Red (VBUS) | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | TS-1187A | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW1 |
| 1 | USB-C far end | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | USB-C source | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | Yellow (D+) | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | Yellow (D-) | LED_SMD:LED_0603_1608Metric | D5 |
| 1 | Yellow (SBU) | LED_SMD:LED_0603_1608Metric | D6 |
Questions
How big is the Cable bunny PCB?
It measures 40 × 96.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cable bunny use?
25 parts, built around the CL21A106KAYNNNE, B5819W, 3034TR and KT-0603R. 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 Cable bunny KiCad files?
From the HeyPCB/cable-bunny repository on GitHub, at the commit this page was made from: the board is kicad/cable_bunny.kicad_pcb and its schematic kicad/cable_bunny.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cable bunny 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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