2 layers60 × 40 mm
2 layers
LRE Xiao Addon
KaitoCross/LuminousRhythmEmitter5DIY Penlight project
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 21
- Pads
- 41
- Tracks, vias
- 81, 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Jul 2025
- Updated
- 6 Mar 2026
Overview
LRE Xiao Addon is an open-source printed circuit board by KaitoCross, from the KaitoCross/LuminousRhythmEmitter repository on GitHub. It is a 2-layer board with 14 parts on 21 nets, routed with 81 tracks and 8 vias.
It is built around the S8050. Its parts include 6 resistors, 3 transistors, 3 connectors and 1 diode.
Main components
1README
README.mdFuture Gadget #16: Luminous Rhythm Emitter
DIY Penlight project
Description
This project is a work in progress! Use and build at your own risk! No guarantees given. Parts of the current version may be untested.
This project aims to create an open-source homemade penlight for various concerts (J-Pop, Idols, VTuber, Vocaloid) that can be controlled remotely. You'll need access to a 3D printer and equipment for soldering SMD parts. You'll have to order a PCB, based on the KiCad design provided in the Circuits folder, as well as some electronic parts. The 3D folder contains the stl files for 3D printing. A parts list is located in the Circuits folder.
Setup
A brief How-To is located in Circuits
Current Features
- Rechargable via USB-C
- Manual selection of LED color by pressing the button (cycling though a preset with 12 colors)
- Setting the color via (unsecured) Bluetooth Low Energy
- Separate Power Off switch
Shoutouts
Shoutouts to:
- rico132 (for helping with Fusion 360 and helping in fixing electronics)
- CaptainMeow (for the Otomo drawing on the PCB design)
- Dominik K (brainstormed the idea with me)
- KFP & the general VTubing community
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 15500 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3 |
| 3 | S8050 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 2 | 5 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R4, R6 |
| 2 | Conn_01x06_Socket | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J1, J3 |
| 1 | 40 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Inolux_IN-P55TATRGB | LED_SMD:LED_Inolux_IN-P55TATRGB_PLCC6_5.0x5.5mm_P1.8mm | D5 |
| 1 | LOGO | general:pcbtomo_smol_v2 | G*** |
Questions
What parts does the LRE Xiao Addon use?
14 parts, built around the S8050. 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 LRE Xiao Addon KiCad files?
From the KaitoCross/LuminousRhythmEmitter repository on GitHub, at the commit this page was made from: the board is Circuits/LRE_Xiao_Addon/LRE_Xiao_Addon.kicad_pcb and its schematic Circuits/LRE_Xiao_Addon/LRE_Xiao_Addon.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LRE Xiao Addon design in my own project?
Its repository states no licence, so its author keeps all rights: ask KaitoCross before reusing the design.
Similar boards
- 10 layers224.5 × 160 mm
Haasoscope pro adc fpga board
drandyhaas/HaasoscopePro
Affordable 2 GHz 3.2 GS/s 12 bit open-source open-hardware expandable USB real-time oscilloscope
586 parts485MIT - 2 layers100 × 57 mm
- 4 layers74 × 104 mm
- 2 layers189.5 × 204.9 mm
SmartSpin2k Panelized
doudar/SmartSpin2k
Transform your spin bike into a Smart Trainer!
749 parts292GPL-2.0 - 2 layers13.7 × 21.4 mm
- 4 layers43 × 49 mm
- 2 layers85 × 56 mm
