2 layers27.9 × 16.5 mm
2 layers92.1 × 88.6 mm
Zenitsu
syvrc/zenitsua Zenitsu keychain that wakes up in the dark! Made for Solder YSWS
- Size
- 92.1 × 88.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 11
- Pads
- 43
- Tracks, vias
- 130, 10
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 Jun 2025
- Updated
- 11 Jun 2025
Overview
Zenitsu is an open-source printed circuit board by syvrc, from the syvrc/zenitsu repository on GitHub. It is a 2-layer board of 92.1 × 88.6 mm with 18 parts on 11 nets, routed with 130 tracks and 10 vias.
Its parts include 8 resistors, 3 transistors, 2 capacitors, 2 diodes and 1 switch.
README
README.mdzenitsu
I made a zenitsu keychain that has 2 LEDs for its eyes that fade on in the dark with a photoresistor and capacitor, it also has a push button to turn the LEDs off even in the dark.
Schematic
PCB
| PCB Front | PCB Back |
|---|---|
 |  |
3d render
| Front | Back |
|---|---|
|  |
Features
it has photoresistor to control when LEDs will be:
ON (dark)andOFF (light)
capacitor for a light fade effect on the LEDs
a toggle button switch to turn off LEDs even when dark outside
its a KEYCHAINN !!!
BOM
| Component | Qty |
|---|---|
| LEDs | 2 |
| Battery Holder | 1 |
| Photoresistor | 1 |
| Potentiometer | 1 |
| 2.2M Resistor | 1 |
| 4.7k Resistor | 1 |
| 47k Resistor | 1 |
| 100k Resistor | 1 |
| 220 Resistor | 1 |
| 470 Resistors | 2 |
| 10uF Capacitor | 1 |
| 470nF Capacitor | 1 |
| Push Button | 1 |
| NPN Transistors | 3 |
made by @syvr (on slack) 🚶♂️
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | NPN | Package_TO_SOT_THT:TO-92L_HandSolder | Q1, Q2, Q3 |
| 2 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 1 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D8.0mm_P5.00mm | C1 |
| 1 | 2.2M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 4.7K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 470nF | Capacitor_THT:CP_Radial_D8.0mm_P5.00mm | C2 |
| 1 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | R_Photo | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R3 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
Questions
How big is the Zenitsu PCB?
It measures 92.1 × 88.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Zenitsu use?
18 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 Zenitsu KiCad files?
From the syvrc/zenitsu repository on GitHub, at the commit this page was made from: the board is src/zenitsu.kicad_pcb and its schematic src/zenitsu.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Zenitsu design in my own project?
Its repository states no licence, so its author keeps all rights: ask syvrc before reusing the design.
Similar boards
- 2 layers42.7 × 13.7 mm
Stm32-mini12864
VoronDesign/Voron-Hardware
Cool Hardware designed by the Voron Design group
18 parts1.1kGPL-3.0 - 2 layers41.2 × 46.6 mm
- 2 layers44 × 51.3 mm
4272MAVcoder R4
hackclub/OnBoard
💡 Join 1,000 teenagers and make your first PCB with a $100 grant!
18 parts915 - 2 layers28.3 × 14.3 mm
Tap Photosensor PCB
VoronDesign/Voron-Tap
Tap is a nozzle-based z-probe for the V2 and Trident printer designs. The entire toolhead moves to trigger an optical switch. Tap offers many advantages:
18 parts716GPL-3.0 - 2 layers20.3 × 15.2 mm
L0 stepper driver
Luos-io/luos_engine
Open-source and real-time orchestrator for cyber-physical-systems, to easily design, test and deploy embedded applications and digital twins.
18 parts546MIT - 2 layers
- 2 layers42.5 × 28.8 mm
C5VRX JACK DIY V2
Twotoz/C5VRX
Ultra-minimal, zero-CPU 5.8 GHz analog FPV video receiver using ESP32-C5 Wi-Fi 6 PHY MODEM_DIAG, BitScrambler WBFM demodulation & resistor DAC CVBS
18 parts515GPL-3.0