2 layers28.3 × 39.8 mm
LevelShifter
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
21 parts5.1kGPL-3.0
2 layers50.2 × 74.9 mm
Keychain
transcental/HCLEDFidgetKeychainFor my Solder project, I decided to make a keychain that has LEDs arranged into the Hack Club "h" logo. The LEDs turn on when it gets dark, and turn off when it's light, using a photoresistor.
- Size
- 50.2 × 74.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 13
- Pads
- 44
- Tracks, vias
- 128, 6
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 15 May 2025
- Updated
- 15 May 2025
Overview
Keychain is an open-source printed circuit board by transcental, from the transcental/HCLEDFidgetKeychain repository on GitHub. It is a 2-layer board of 50.2 × 74.9 mm with 21 parts on 13 nets, routed with 128 tracks and 6 vias.
Its parts include 10 resistors, 6 diodes, 1 transistor and 1 switch.
README
README.mdHack Club LED Fidget Keychain
For my Solder project, I decided to make a keychain that has LEDs arranged into the Hack Club "h" logo. The LEDs turn on when it gets dark, and turn off when it's light, using a photoresistor. The design also features a button controller vibration motor for maximum fidgeting ability.
Parts List
- 1x PCB
- 6x LEDs
- 6x 220Ω resistors
- 3x 4.7kΩ resistors
- 1x Photoresistor
- 1x Push button
- 1x Vibration motor
- 1x CR2032 battery holder
- 1x CR2032 battery
- 1x NPN transistor
Images
Schematic
PCB
3D Model
Made by Amber - @transcental on Slack
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R8, R9, R10 |
| 6 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | LOGO | LOGO | G*** |
| 1 | Motor_DC | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical | M1 |
| 1 | NPN | Package_TO_SOT_THT:TO-92L_HandSolder | Q1 |
| 1 | R_Photo | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R7 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
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Questions
How big is the Keychain PCB?
It measures 50.2 × 74.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keychain use?
21 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 Keychain KiCad files?
From the transcental/HCLEDFidgetKeychain repository on GitHub, at the commit this page was made from: the board is src/Keychain.kicad_pcb and its schematic src/Keychain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keychain design in my own project?
Its repository states no licence, so its author keeps all rights: ask transcental before reusing the design.