Koe Pro v2
About the Koe Pro v2 PCB
Koe Pro v2 is an open source Nordic nRF PCB design by yukihamada, published on GitHub under the MIT license. It is a 4-layer board measuring 45 × 30 mm, with 43 components from 29 distinct parts.
Its main chip is the nRF5340-QKAA, from the Nordic nRF family. Other key parts include the DW3720, AK5720VT, PCM5102A, MAX98357A and nPM1300. By type, the board carries 15 capacitors, 9 resistors, 6 ICs, 4 connectors, 2 crystals and 2 diodes.
It belongs with the audio, rf & radio and power & battery designs in this gallery.
From the project
Koe — AI voice companion device + Soluna Edition festival audio. Open hardware, ESP32-S3 + Raspberry Pi CM5, GPS atomic clock sync.
nRF5340 + DW3720 UWB, 45x30mm 4-layer PCB.
Main components on the Koe Pro v2
Koe Pro v2 bill of materials (BOM)
43 components, 29 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | nRF5340-QKAA | QFN-94-1EP_7x7mm_P0.4mm | U1 |
| 1 | DW3720 | QFN-48-1EP_6.5x6.5mm_P0.5mm | U2 |
| 1 | AK5720VT | SSOP-16_5.3x6.2mm_P0.65mm | U3 |
| 1 | PCM5102A | TSSOP-20_4.4x6.5mm_P0.65mm | U4 |
| 1 | MAX98357A | QFN-16-1EP_3x3mm_P0.5mm | U5 |
| 1 | nPM1300 | QFN-32-1EP_5x5mm_P0.5mm | U6 |
| 1 | 32MHz | Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 32.768kHz | Crystal_SMD_1610-2Pin_1.6x1.0mm | Y2 |
| 1 | USB-C | USB_C_Receptacle_USB2.0 | J1 |
| 1 | PJ-320A | AudioJack3_SJ_CUI_SJ-3523-SMT | J2 |
| 1 | SMA_UWB | SMA_Amphenol_132289_EdgeMount | J3 |
| 1 | BLE_ANT | Texas_SWRA117D_2.4GHz_Right | J4 |
| 1 | LiPo_800mAh | JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT1 |
| 1 | Speaker | PinHeader_1x02_P2.54mm_Vertical | SPK1 |
| 1 | BTN | SW_SPST_CK_RS282G05A3 | SW1 |
| 2 | WS2812B | LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1, D2 |
| 1 | 10uH | L_0805_2012Metric | L1 |
| 1 | 4.7uH | L_0805_2012Metric | L2 |
| 5 | 100nF | C_0402_1005Metric | C1, C2, C5, C7, C9 |
| 2 | 10uF | C_0603_1608Metric | C3, C12 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1uF | C_0402_1005Metric | C4 |
| 1 | 10nF | C_0402_1005Metric | C6 |
| 3 | 10uF | C_0402_1005Metric | C8, C10, C11 |
| 1 | 22uF | C_0603_1608Metric | C13 |
| 2 | 12pF | C_0402_1005Metric | C14, C15 |
| 2 | 5.1k | R_0402_1005Metric | R1, R2 |
| 1 | 330R | R_0402_1005Metric | R3 |
| 2 | 4.7k | R_0402_1005Metric | R4, R5 |
| 4 | 10k | R_0402_1005Metric | R6, R7, R8, R9 |
Koe Pro v2 design files
The KiCad project lives in the yukihamada/koe-device repository on GitHub; these links point at the commit this page was built from.
Koe Pro v2: common questions
What microcontroller does the Koe Pro v2 use?
The Koe Pro v2 is built around the nRF5340-QKAA, from the Nordic nRF family.
How big is the Koe Pro v2 PCB?
The Koe Pro v2 measures 45 × 30 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Koe Pro v2?
43 components, from 29 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Koe Pro v2 design files?
From the yukihamada/koe-device repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Koe Pro v2 design in my own project?
Yes, under the terms of its MIT license, which yukihamada chose for the repository.
Can I test firmware for the Koe Pro v2 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.
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