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 layers156 × 55.9 mm
Ruler dino
HeyPCB/ruler-dinoRuler Dino: The bench ruler that measures, sizes screws and tests your wires. KiCad 10, heypcb.ai merch.
- Size
- 156 × 55.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 5
- Pads
- 19
- Tracks, vias
- 42, 9
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 5 Oct 2026
- Updated
- 5 Oct 2026
Overview
Ruler dino is an open-source printed circuit board by HeyPCB, from the HeyPCB/ruler-dino repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 156 × 55.9 mm with 13 parts on 5 nets, routed with 42 tracks and 9 vias.
It is built around the CL21A106KAYNNNE, 3034TR and M2.5, with the KT-0603R among its other parts. Its parts include 2 resistors, 1 capacitor and 1 diode.
Main components
4
CL21A106KAYNNNE
080510uF 25V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
3034TR
-- Battery Snap ROHSKeystone ElectronicsBatteryConnectorM2.5
-0.45mm 2.5mm 2mm 5mm DIN934 Hex M2.5X0.45 Nickel plated Silver white - Hexagonal nutsShuntianHex Nut
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
README
README.mdRuler Dino
The bench ruler that measures, sizes screws and tests your wires.
Ruler Dino is a 15 cm workbench ruler shaped like a long-necked dinosaur. Gold ENIG millimetre ticks run along its straight bottom edge; gold land patterns size 0402-1206 passives and SOT-23 parts; drilled holes size M2-M4 screws. A CR2032 in its belly runs an LED tester and a continuity tester: anything that conducts between its gold nose and its gold tail club lights its tail light. The back carries a resistor colour code and an inch scale. There is no MCU.
| Layers | Size | Parts | Nets | Connections routed | Vias | ERC errors | DRC errors / unconnected / parity | BOM @100 |
|---|---|---|---|---|---|---|---|---|
| 2 | 156.1 x 56.0 mm | 9 (+4 pads) | 5 | 10 -> 0 open | 9 | 0 | 0 / 0 / 0 | $0.48 |
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
- Scale: 0-150 mm as one gold comb (1/5/10 mm teeth) 0.6 mm in from the measuring edge; cm numbers in silk; a 1/8" inch scale on the back.
- Gauges: gold 0402, 0603, 0805, 1206 and SOT-23 lands; drilled M2, M2.5, M3 and M4 clearance holes.
- Continuity: VBAT through 220 Ohm and the red tail-light LED to the tail club; the nose is ground.
- LED tester: VBAT through 100 Ohm to a gold + pad; the - pad is ground.
- Power: one CR2032 in a Keystone 3034 holder, used only while pads are bridged.
Finish
Purple 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/9077794f93d5.
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
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | CR2032 | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | LED+ | TestPoint:TestPoint_Pad_2.0x2.0mm | TP3 |
| 1 | LED- | TestPoint:TestPoint_Pad_2.0x2.0mm | TP4 |
| 1 | M2 | MountingHole:MountingHole_2.2mm_M2 | H1 |
| 1 | M2.5 | MountingHole:MountingHole_2.7mm_M2.5 | H2 |
| 1 | M3 | MountingHole:MountingHole_3.2mm_M3 | H3 |
| 1 | M4 | MountingHole:MountingHole_4.3mm_M4 | H4 |
| 1 | PROBE_A | TestPoint:TestPoint_Pad_D4.0mm | TP1 |
| 1 | PROBE_B | TestPoint:TestPoint_Pad_D4.0mm | TP2 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | D1 |
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Questions
How big is the Ruler dino PCB?
It measures 156 × 55.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ruler dino use?
13 parts, built around the CL21A106KAYNNNE, 3034TR, M2.5 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 Ruler dino KiCad files?
From the HeyPCB/ruler-dino repository on GitHub, at the commit this page was made from: the board is kicad/ruler_dino.kicad_pcb and its schematic kicad/ruler_dino.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ruler dino 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).