2 layers56.7 × 27.7 mm
Solder
JavaScythe/dtect
Adjustable small haptic controller for light sensor and button override.
10 parts
2 layers85 × 55 mm
Singingcard
zeulewan/singingcardExperiment: Claude Code autonomously designs and orders PCBs from start to finish
- Size
- 85 × 55 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 14
- Pads
- 88
- Tracks, vias
- 157, 22
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Dec 2025
- Updated
- 1 Jan 2026
Overview
Singingcard is an open-source printed circuit board by zeulewan, from the zeulewan/singingcard repository on GitHub. It is a 2-layer board of 85 × 55 mm with 16 parts on 14 nets, routed with 157 tracks and 22 vias.
It is built around the ISD3900FYI, W25Q16JVSSIQ and CR2032, with the GL5528 and KLJ-01304T-08R07W among its other parts. Its parts include 6 capacitors, 4 resistors, 2 ICs, 1 connector and 1 switch.
Main components
5
ISD3900FYI
LQFP-48(7x7)-40℃~+85℃ 2.7V~3.6V 4kHz~48kHz I2S、SPI LQFP-48(7x7) Audio Interface ICs ROHSNuvoton TechAudio Interface ICs
W25Q16JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 10uA 133MHz 16Mbit 2.7V~3.6V 20 Years 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
CR2032
-- Unclassified goods ROHSMaxellUncategorised
GL5528
插件,P=3mm-30℃~+70℃ 0.6 10kΩ~20kΩ 150V 1MΩ 30ms 30ms 540nm 插件,P=3mm Photoresistors ROHS森霸Photoresistors
KLJ-01304T-08R07W
SMD-40℃~+85℃ 5% 700mW 850Hz 850Hz~20kHz 8Ω Electromagnetic SMD SMD Speakers ROHSKELIKINGSpeakers
README
README.mdKiCad Agent Experiment
An experiment to have Claude Code autonomously design and order PCBs from start to finish.
Goal
Given project requirements (e.g., "make an ESP32 dev board with USB-C and 3 GPIO LEDs"), Claude Code should be able to:
- Research and select appropriate components from JLCPCB's library
- Design the schematic with proper connections
- Create the PCB layout
- Auto-route the traces
- Run DRC/ERC checks
- Generate fabrication files
- Order the PCB via JLCPCB API
The human should only need to:
- Provide initial requirements
- Set up API keys
- Occasionally review/approve major decisions
Status
Setup Phase - Installing tools and creating workflow documentation.
Structure
singingcard/
├── kicad/ # KiCad project files
├── docs/ # Documentation and notes
├── venv/ # Python virtual environment
└── .claude/skills/ # Claude skill for KiCad workflowTools
See docs/tool-setup.md for installed tools and configuration.
Board Design
3D Render
Schematic
PCB Layout
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C4, C6 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R2, R3, R4 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C2, C5 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | Button | Button_Switch_SMD:SW_SPST_TL3342 | SW1 |
| 1 | CR2032 | singingcard:BAT-TH_CR2032-BS-6-1 | BT1 |
| 1 | GL5528 | singingcard:RES-TH_L5.1-W4.3-P3.40-D0.5 | R1 |
| 1 | ISD3900FYI | singingcard:LQFP-48_L7.0-W7.0-P0.50-LS9.0-BL | U1 |
| 1 | KLJ-01304T-08R07W | speaker:BUZ-SMD_4P-L13.0-W13.0-P11.4-BL | LS1 |
| 1 | Pull-Tab | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | W25Q16JVSSIQ | singingcard:SOIC-8_L5.3-W5.3-P1.27-LS8.0-BL | U2 |
Questions
How big is the Singingcard PCB?
It measures 85 × 55 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Singingcard use?
16 parts, built around the ISD3900FYI, W25Q16JVSSIQ, CR2032 and GL5528. 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 Singingcard KiCad files?
From the zeulewan/singingcard repository on GitHub, at the commit this page was made from: the board is kicad/singingcard.kicad_pcb and its schematic kicad/singingcard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Singingcard design in my own project?
Its repository states no licence, so its author keeps all rights: ask zeulewan before reusing the design.
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