2 layers117.3 × 54.5 mm
2 layers21.6 × 33.4 mm
LEDKeychain
LizOnAir/PCB-KeychainA keychain that can carry a url and blink when tapped on a phone
- Size
- 21.6 × 33.4 mm
- Copper layers
- 2
- Thickness
- 1.29 mm
- Parts
- 69
- Nets
- 8
- Pads
- 19
- Tracks, vias
- 21, 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 19 Mar 2026
- Updated
- 2 Apr 2026
Overview
LEDKeychain is an open-source printed circuit board by LizOnAir, from the LizOnAir/PCB-Keychain repository on GitHub. It is a 2-layer board of 21.6 × 33.4 mm with 69 parts on 8 nets, routed with 21 tracks and 1 via.
Its parts include 1 capacitor, 1 resistor, 1 IC, 1 diode and 1 inductor.
README
README.mdPCB Keychain
This keychain have a NFC chip and a LED. It act as a RFID tag, which use NFC tools to program the NFC chip.
Features:
- RFID tag to carry url
- LED for glowing effect
PCB:
Here's my PCB! It was made in KiCad. Schematic
PCB
I generate the antenna with this script. I also follow these design guide: design guide 1, design guide 2
Result:
BOM:
Here should be everything you need to make this keychain
- 1x 220nF capacitor
- 1x 51 ohm resistor
- 1x 2V LED
- 1x NT3H2111W0FHKH NFC chip
Parts
69| Qty | Value | Footprint | References |
|---|---|---|---|
| 61 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +45 |
| 1 | 13.56MHz | NFCLib:XQFN-8_L1.6-W1.6-P0.50-BL_NT3H2111W0FHKH | U1 |
| 1 | 220nF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 47 | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | L | Antenna:Antenna_8500000x5500000mm | L1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
The 66 most common of 69 parts.
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Questions
How big is the LEDKeychain PCB?
It measures 21.6 × 33.4 mm and has 2 copper layers, 1.29 mm thick.
What parts does the LEDKeychain use?
69 parts. 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 LEDKeychain KiCad files?
From the LizOnAir/PCB-Keychain repository on GitHub, at the commit this page was made from: the board is PCB/LEDKeychain.kicad_pcb and its schematic PCB/LEDKeychain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LEDKeychain design in my own project?
Its repository states no licence, so its author keeps all rights: ask LizOnAir before reusing the design.