4 layers26 × 26 mm
Koe coin
yukihamada/koe-device
Koe — AI voice companion device + Soluna Edition festival audio. Open hardware, ESP32-S3 + Raspberry Pi CM5, GPS atomic clock sync.
24 parts1MIT
4 layers45 × 30 mm
Koe pro v2
yukihamada/koe-device1Koe — AI voice companion device + Soluna Edition festival audio. Open hardware, ESP32-S3 + Raspberry Pi CM5, GPS atomic clock sync.
- Size
- 45 × 30 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 47
- Nets
- 41
- Pads
- 95
- Tracks, vias
- 50, 20
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Mar 2026
- Updated
- 28 Jul 2026
Overview
Koe pro v2 is an open-source printed circuit board by yukihamada, from the yukihamada/koe-device repository on GitHub, published under the MIT licence. It is a 4-layer board of 45 × 30 mm with 47 parts on 41 nets, routed with 50 tracks and 20 vias.
It is built around the NRF5340-QKAA-R, AK5720VT and PCM5102APW, with the WS2812B and PJ-320A among its other parts. Its parts include 15 capacitors, 9 resistors, 6 ICs, 4 connectors and 2 diodes. It belongs with the radio and wireless boards and the nRF52 and nRF5x boards of this library.
Main components
5
NRF5340-QKAA-R
AQFN-94(7x7)-40℃~+105℃ -97.5dBm 1.7V~5.5V 2.4GHz 2.6mA 2Mbps 3.2mA 3dBm Bluetooth、802.15.4 SPI、USB、UART、ADC、I2S、PWM transceiver AQFN-94(7x7) RF Transceiver ICs ROHSNordic SemiconRF Transceiver ICs
AK5720VT
TSSOP-16-40℃~+105℃ 10uA 2 2.7V~5.5V 24 96000Hz Audio Analog-to-Digital Converter I2S TSSOP-16 ADCs/DACs - Special Purpose ROHSAsahi Kasei MicrodevicesADCs/DACs - Special Purpose
PCM5102APW
TSSOP-20-25℃~+85℃ 1.8V~3.3V 2 32 384kHz 500uA 50MHz Audio Decoder Digital filtering、Power-down mode I2S TSSOP-20 ADCs/DACs - Special Purpose ROHSTexas InstrumentsADCs/DACs - Special Purpose
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
PJ-320A
插件-20℃~+70℃ 3.5mm Headphone Jack 30V 500mA 插件 Audio Connectors ROHSXKB ConnectionAudio Connectors (Headphones)
README
hardware/kicad-pro-v2/README.mdKoe Pro v2 --- KiCad Project
nRF5340 + DW3720 UWB, 45x30mm 4-layer PCB.
Open in KiCad
- Install KiCad 8.0+
- Open koe-pro-v2.kicad_pro
- Install Nordic lib: Plugin Manager -> Add repo -> https://raw.githubusercontent.com/hlord2000/hlord2000-kicad-repository/main/repository.json
Generate Manufacturing Files
- Plot -> Gerber (F.Cu, B.Cu, In1.Cu, In2.Cu, F.Mask, B.Mask, F.SilkS, Edge.Cuts)
- Drill -> Excellon
- BOM -> KiCad BOM plugin
- CPL -> Fabrication Outputs -> Footprint Position
JLCPCB Order
- Upload Gerber ZIP
- Select 4-layer, 1.6mm, FR-4, HASL
- Upload BOM + CPL for SMT assembly
Key ICs
| Ref | Part | Function |
|---|---|---|
| U1 | nRF5340-QKAA | BLE 5.3 MCU (dual-core M33) |
| U2 | DW3720 | UWB transceiver |
| U3 | AK5720 | 24-bit ADC |
| U4 | PCM5102A | 32-bit DAC |
| U5 | MAX98357A | I2S speaker amp |
| U6 | nPM1300 | PMIC (LiPo charger + buck) |
BOM Cost
~$23.05 per board (JLCPCB SMT assembly)
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C5, C7, C9 |
| 4 | 10k | Resistor_SMD:R_0402_1005Metric | R6, R7, R8, R9 |
| 4 | M2 | MountingHole:MountingHole_2.2mm_M2_Pad | MH1, MH2, MH3, MH4 |
| 3 | 10uF | Capacitor_SMD:C_0402_1005Metric | C8, C10, C11 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C3, C12 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C14, C15 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | WS2812B | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1, D2 |
| 1 | 10nF | Capacitor_SMD:C_0402_1005Metric | C6 |
| 1 | 10uH | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 22uF | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_1610-2Pin_1.6x1.0mm | Y2 |
| 1 | 32MHz | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 330R | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 4.7uH | Inductor_SMD:L_0805_2012Metric | L2 |
| 1 | AK5720VT | Package_SO:SSOP-16_5.3x6.2mm_P0.65mm | U3 |
| 1 | BLE_ANT | RF_Antenna:Texas_SWRA117D_2.4GHz_Right | J4 |
| 1 | BTN | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW1 |
| 1 | DW3720 | Package_QFN:QFN-48-1EP_6.5x6.5mm_P0.5mm | U2 |
| 1 | LiPo_800mAh | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT1 |
| 1 | MAX98357A | Package_QFN:QFN-16-1EP_3x3mm_P0.5mm | U5 |
| 1 | PCM5102A | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U4 |
| 1 | PJ-320A | Connector_Audio:AudioJack3_SJ_CUI_SJ-3523-SMT | J2 |
| 1 | SMA_UWB | Connector_Coaxial:SMA_Amphenol_132289_EdgeMount | J3 |
| 1 | Speaker | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SPK1 |
| 1 | USB-C | Connector_USB:USB_C_Receptacle_USB2.0 | J1 |
| 1 | nPM1300 | Package_QFN:QFN-32-1EP_5x5mm_P0.5mm | U6 |
| 1 | nRF5340-QKAA | Package_QFN:QFN-94-1EP_7x7mm_P0.4mm | U1 |
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Questions
How big is the Koe pro v2 PCB?
It measures 45 × 30 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Koe pro v2 use?
47 parts, built around the NRF5340-QKAA-R, AK5720VT, PCM5102APW and WS2812B. 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 Koe pro v2 KiCad files?
From the yukihamada/koe-device repository on GitHub, at the commit this page was made from: the board is hardware/kicad-pro-v2/koe-pro-v2.kicad_pcb and its schematic hardware/kicad-pro-v2/koe-pro-v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Koe pro v2 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).