HeyPCB/torch-catTorch Cat: Boop the cat's nose and its eyes light up your keyhole. KiCad 10, heypcb.ai merch.
Torch cat is an open-source printed circuit board by HeyPCB, from the HeyPCB/torch-cat repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 40.3 × 61.3 mm with 18 parts on 13 nets, routed with 112 tracks and 16 vias.
It is built around the ATTINY412-SSN, AO3400A and XL-2835UWC-05, with the CC0603KRX7R9BB104, CL21A106KAYNNNE and 3034TR among its other parts. Its parts include 6 resistors, 2 capacitors, 2 diodes, 2 transistors and 1 IC. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Boop the cat's nose and its eyes light up your keyhole.
Torch Cat is a keychain flashlight shaped like a black cat, on one CR2032. Its two 2835 white LED eyes are the torch; double-tap its gold nose and they turn into a softly breathing night glow instead. The nose is a touch pad read without touch hardware (RC charge time through 1 MΩ), and its left ear is pierced for the keyring.
| Layers | Size | Parts | Nets | Connections routed | Vias | ERC errors | DRC errors / unconnected / parity | BOM @100 |
|---|---|---|---|---|---|---|---|---|
| 2 | 40.4 x 61.4 mm | 14 (+4 pads) | 12 | 28 -> 0 open | 16 | 0 | 0 / 0 / 0 | $1.21 |
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 | firmware/ |
| Renders | front, back, hero, Circuit World thumbnail |
| Brief and generator | design/ |
Black solder mask, White silkscreen, ENIG copper finish, 1.6 mm FR4, top-side SMT assembly. 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/1127a7fb044e.
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.
Hardware: CERN-OHL-S v2. Firmware: MIT (see firmware/LICENSE). KiCad's symbol, footprint and 3D
libraries used in the design are CC-BY-SA 4.0 with the KiCad library exception.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R2, R4 |
| 2 | 4.7 | Resistor_SMD:R_0603_1608Metric | R1, R3 |
| 2 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | White 2835 | LED_SMD:LED_PLCC_2835 | D1, D2 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | ATtiny412 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | GND | TestPoint:TestPoint_Pad_1.0x1.0mm | TP3 |
| 1 | TOUCH | TestPoint:TestPoint_Pad_D4.0mm | TP4 |
| 1 | UPDI | TestPoint:TestPoint_Pad_1.0x1.0mm | TP2 |
| 1 | VCC | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1 |
It measures 40.3 × 61.3 mm and has 2 copper layers, 1.6 mm thick.
18 parts, built around the ATTINY412-SSN, AO3400A, XL-2835UWC-05 and CC0603KRX7R9BB104. 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.
From the HeyPCB/torch-cat repository on GitHub, at the commit this page was made from: the board is kicad/torch_cat.kicad_pcb and its schematic kicad/torch_cat.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
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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