2 layers333.4 × 149.9 mm
2 layers63.5 × 50.8 mm
Charlieplex Light Bell
- Size
- 63.5 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 8
- Pads
- 61
- Tracks, vias
- 187, 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 Apr 2016
- Updated
- 20 Jul 2026
Overview
Bell is an open-source printed circuit board by UserHackable, from the UserHackable/Bell repository on GitHub. It is a 2-layer board of 63.5 × 50.8 mm with 26 parts on 8 nets, routed with 187 tracks and 3 vias.
It is built around the CR2032. Its parts include 20 diodes, 1 IC and 1 connector.
Main components
1README
README.mdBell
Board dimensions
- (250000, 200000) original units
- (2.5000, 2.0000) inches
- (63.5000, 50.8000) mm
| Front | Back |
|---|---|
 |  |
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | LED5MM | LED1, LED2, LED3, LED4, LED5, LED10, LED11, LED12, LED13, LED14, LED15, LED16, LED17, LED18, LED19, LED20 +4 | |
| 1 | dummyfp0 | UNK_HOLE_0 | |
| 1 | dummyfp1 | UNK_HOLE_1 | |
| 1 | CR2032 | CR2032-THRU | BATT0 |
| 1 | ICSP | 2X3-NS | J1 |
| 1 | TAC_SPST_NO | TAC_SPST_NO | RESET0 |
| 1 | TINY85 | DIP08 | U1 |
Questions
How big is the Bell PCB?
It measures 63.5 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bell use?
26 parts, built around the CR2032. 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 Bell KiCad files?
From the UserHackable/Bell repository on GitHub, at the commit this page was made from: the board is KiCad/Bell/Bell.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bell design in my own project?
Its repository states no licence, so its author keeps all rights: ask UserHackable before reusing the design.
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