4 layers300 × 120 mm
4 layers65 × 56 mm
Le DAW!!!
- Size
- 65 × 56 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 80
- Nets
- 74
- Pads
- 268
- Tracks, vias
- 480, 108
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Feb 2026
- Updated
- 1 Nov 2026
Overview
Hat is an open-source printed circuit board by wang-edward, from the wang-edward/ledaw repository on GitHub, published under the MIT licence. It is a 4-layer board of 65 × 56 mm with 80 parts on 74 nets, routed with 480 tracks and 108 vias.
It is built around the CAT24C256LI and ESDA6V1BC6. Its parts include 30 capacitors, 5 resistors, 5 connectors, 4 ICs and 1 diode.
Main components
2
CAT24C256LI
PDIP-81,000,000 cycles 1.8V~5.5V 100 Years 256Kbit 400kHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C PDIP-8 EEPROM ROHSonsemiEEPROM
ESDA6V1BC6
SOT-23-6L-40℃~+125℃@(Ta) 1uA 20pF 4 5V 6.1V 6.1V 80W Bidirectional ESD IEC 61000-4-2 SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
README
README.mdledaw
run desktop app
cargo runbuild
cargo buildbuild firmware
cargo build -p firmwaretest
cargo testlint + format
# rustup component add clippy rustfmt # if you don't have it
cargo clippy --all-targets --all-features
cargo fmt --checkFirmware
see firmware/README.md for flashing the rp2350.
pics
Video demo
Video demo 2 (art project)
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 1uF | Capacitor_SMD:C_0805_2012Metric | C205, C206, C207, C208, C209, C217, C218, C220, C221, C223, C225, C226, C227, C228, C229 |
| 6 | 100nF | Capacitor_SMD:C_0805_2012Metric | C101, C202, C204, C210, C212, C216 |
| 5 | 600Ohm@100MHz | Inductor_SMD:L_0805_2012Metric | FB201, FB202, FB203, FB204, FB205 |
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric | C201, C203, C213, C215 |
| 4 | 470pF | Capacitor_SMD:C_0805_2012Metric | C211, C214, C219, C222 |
| 4 | MountingHole_2.7mm_M2.5 | MountingHole:MountingHole_2.7mm_M2.5 | MH1, MH2, MH3, MH4 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R201, R203 |
| 2 | 3.9k | Resistor_SMD:R_0805_2012Metric | R101, R102 |
| 1 | 12.288MHz | Oscillator:Oscillator_SMD_SeikoEpson_SG210-4Pin_2.5x2.0mm | Y201 |
| 1 | 2.2k | Resistor_SMD:R_0805_2012Metric | R202 |
| 1 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C224 |
| 1 | 5V | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP101 |
| 1 | CAT24C256 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U102 |
| 1 | CODEC_MCLK | TestPoint:TestPoint_Pad_D2.0mm | TP201 |
| 1 | ESDA6V1BC6 | Package_TO_SOT_SMD:SOT-23-6 | D201 |
| 1 | GND | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TP102 |
| 1 | GPIO | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J101 |
| 1 | HPL | TestPoint:TestPoint_Pad_D2.0mm | TP212 |
| 1 | HPR | TestPoint:TestPoint_Pad_D2.0mm | TP209 |
| 1 | HPSNS | TestPoint:TestPoint_Pad_D2.0mm | TP214 |
| 1 | Headphone | footprints:CUI_SJ-43514-SMT-TR | J203 |
| 1 | ID_WP | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP101 |
| 1 | INA1 | TestPoint:TestPoint_Pad_D2.0mm | TP208 |
| 1 | INA2 | TestPoint:TestPoint_Pad_D2.0mm | TP211 |
| 1 | JACKSENSE | TestPoint:TestPoint_Pad_D2.0mm | TP203 |
| 1 | LDO_IN | TestPoint:TestPoint_Pad_D2.0mm | TP217 |
| 1 | LDO_OUT | TestPoint:TestPoint_Pad_D2.0mm | TP218 |
| 1 | LineIn | Connector_Audio:Jack_3.5mm_CUI_SJ-3523-SMT_Horizontal | J202 |
| 1 | LineOut | Connector_Audio:Jack_3.5mm_CUI_SJ-3523-SMT_Horizontal | J201 |
| 1 | MAX98089ETN_T | footprints:MAX98089ETN_T | U201 |
| 1 | MIC2N | TestPoint:TestPoint_Pad_D2.0mm | TP215 |
| 1 | MIC2P | TestPoint:TestPoint_Pad_D2.0mm | TP213 |
| 1 | MICBIAS | TestPoint:TestPoint_Pad_D2.0mm | TP207 |
| 1 | MicL | Sensor_Audio:Knowles_LGA-5_3.5x2.65mm | MK201 |
| 1 | MicR | Sensor_Audio:Knowles_LGA-5_3.5x2.65mm | MK202 |
| 1 | Oled | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | U101 |
| 1 | RECN | TestPoint:TestPoint_Pad_D2.0mm | TP206 |
| 1 | RECP | TestPoint:TestPoint_Pad_D2.0mm | TP204 |
| 1 | SPKLN | TestPoint:TestPoint_Pad_D2.0mm | TP205 |
| 1 | SPKLP | TestPoint:TestPoint_Pad_D2.0mm | TP202 |
| 1 | SPKRN | TestPoint:TestPoint_Pad_D2.0mm | TP216 |
| 1 | SPKRP | TestPoint:TestPoint_Pad_D2.0mm | TP210 |
| 1 | SpeakerL | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | LS201 |
| 1 | SpeakerR | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | LS202 |
| 1 | TPS7A20xxxDBV | Package_TO_SOT_SMD:SOT-23-5 | U202 |
| 1 | Uart | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J102 |
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Questions
How big is the Hat PCB?
It measures 65 × 56 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Hat use?
80 parts, built around the CAT24C256LI and ESDA6V1BC6. 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 Hat KiCad files?
From the wang-edward/ledaw repository on GitHub, at the commit this page was made from: the board is hardware/hat/hat.kicad_pcb and its schematic hardware/RP-008173-DS-1-CM4IO-KiCAD/CM4IOv5.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hat 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).