2 layers43.9 × 27.7 mm
2 layers83 × 97.9 mm
Fidget keychain
GlassyBridge/Keychain-PCB3My first PCB design. Made for solder at hack club. Thanks PCBway.
- Size
- 83 × 97.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 9
- Pads
- 39
- Tracks, vias
- 68, 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Jun 2025
- Updated
- 3 Jul 2025
Overview
Fidget keychain is an open-source printed circuit board by GlassyBridge, from the GlassyBridge/Keychain-PCB repository on GitHub, published under the MIT licence. It is a 2-layer board of 83 × 97.9 mm with 19 parts on 9 nets, routed with 68 tracks and 2 vias.
Its parts include 8 resistors, 2 diodes, 2 switches and 1 transistor.
README
README.mdKeychain-PCB
My first PCB design. Made for solder at hackclub, a challenge that requires the partticipants to build a PCB using limited components. It is a Keychain based on my PFP(profile picture) on hackclub's slack, @GB114.
Features
- Two LEDs that light up when SW1 is pressed.
- Photoresistor with transistor(NPN) to not turn on the LEDs in bright environments.
- DC_Motor(Vibrator) that vibrates when SW2 is pressed.
- The intensity is adjustable by a potentiometer.
How to get yours?
- Just take the gerber.zip file from the production folder and give it to your manufacturer. (or manufacture it yourself.)
BOM (Bill of Materials)
| Material | Footprint | Quantity | Types |
|---|---|---|---|
| Battery holder | BatteryHolder_Keystone_3034_1x20mm | 1 | |
| LEDs | LED_D5.0mm | 2 | |
| DC_Motor | PinHeader_1x02_P2.54mm_Vertical | 1 | |
| Transistor(NPN) | TO-92L_HandSolder | 1 | |
| Resistors | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | 7 | 6 - 220Ω, 1 - 4.7kΩ |
| R_Photo | R_LDR_5.1x4.3mm_P3.4mm_Vertical | 1 | |
| Potentiometer | Potentiometer_Vishay_T73YP_Vertical | 1 | |
| Push buttons | SW_PUSH_6mm | 2 |
Schematics
PCB
3D view
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | ~ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R6, R7, R8 |
| 3 | LOGO | LOGO | G***, G***, G*** |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | Motor_DC | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | M1 |
| 1 | NPN | Package_TO_SOT_THT:TO-92L_HandSolder | Q1 |
| 1 | R-220Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | R-220Ω each = 44Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | R-4.7kΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | R_Photo | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R2 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
Questions
How big is the Fidget keychain PCB?
It measures 83 × 97.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Fidget keychain use?
19 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 Fidget keychain KiCad files?
From the GlassyBridge/Keychain-PCB repository on GitHub, at the commit this page was made from: the board is Fidget_keychain.kicad_pcb and its schematic Fidget_keychain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Fidget keychain design in my own project?
Its repository publishes it under the MIT 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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