WK-1
About the WK-1 PCB
WK-1 is an open source ESP32 PCB design by zOnlyKroks, published on GitHub under the CC0-1.0 license. It is a 4-layer board measuring 49.9 × 99.8 mm, with 89 components from 40 distinct parts.
Its main chip is the ESP32-S3-MINI-1U, from the ESP32 family. Other key parts include the CC110LRGPR, CS4344, PRTR5V0U2X, MIC5504-3.3YM5 and PAM8406D. By type, the board carries 36 capacitors, 15 switches, 12 resistors, 11 ICs, 7 connectors and 4 inductors.
Main components on the WK-1
WK-1 bill of materials (BOM)
89 components, 40 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CC110LRGPR | QFN50P400X400X100-21N-D | IC1 |
| 1 | ESP32-S3-MINI-1U | ESP32-S2-MINI-1U | U1 |
| 1 | CS4344 | TSSOP-10_3x3mm_P0.5mm | U2 |
| 1 | PRTR5V0U2X | SOT-143 | U4 |
| 1 | MIC5504-3.3YM5 | SOT-23-5 | U5 |
| 1 | PAM8406D | SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 4 | WS2812B-B | LED_WS2812B-B | U7, U8, U9, U10 |
| 1 | PCF8574AT | SOIC-16W_7.5x10.3mm_P1.27mm | U11 |
| 1 | 26MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | C8465 L_OUT | WJ500V-5.08-2P | J1 |
| 1 | USB_C_RECEPTACLE_USB2.0 USB_C_Receptacle_USB2.0 | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
| 1 | C8465 R_OUT | WJ500V-5.08-2P | J3 |
| 1 | AUDIOJACK3 AudioJack3 | Jack_3.5mm_CUI_SJ1-3533NG_Horizontal | J4 |
| 1 | CONN_01X04_PIN Conn_01x04_Pin | PinSocket_1x04_P2.54mm_Vertical | J8 |
| 1 | C5116483 DEBG | PinSocket_1x04_P2.54mm_Vertical | J9 |
| 1 | C496551 ANT | SMA_BAT_Wireless_BWSMA-KWE-Z001 | J10 |
| 1 | C135341 500 mA | Fuse_1206_3216Metric | F1 |
| 1 | ICS-43434 | InvenSense_ICS-43434-6_3.5x2.65mm | MK1 |
| 1 | 56k | R_0603_1608Metric | Rbias1 |
| 1 | SSSS811101 | SSSS811101 | S1 |
Show 20 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 14 | C2837531 EN | KH-6X6X5H-STM_SKE | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +6 |
| 2 | 33 nH | L_0805_2012Metric | L16, L19 |
| 2 | 18 nH | L_0805_2012Metric | L17, L18 |
| 7 | 10UF 10uF | C_0603_1608Metric | C3, C5, C7, C9, C38, C39, C40 |
| 2 | 3.3 uF | CP_Elec_6.3x5.4 | C4, C31 |
| 6 | 100NF 100nF | C_0603_1608Metric | C6, C22, C23, C34, C35, C41 |
| 1 | 680 uF | CP_Elec_8x10.5 | C8 |
| 1 | 3.3UF 3.3uF | C_0603_1608Metric | C10 |
| 3 | 12 pF | C_0603_1608Metric | C11, C12, C46 |
| 2 | 1 uF | C_0603_1608Metric | C21, C42 |
| 4 | 47UF 47uF | C_1206_3216Metric | C25, C26, C32, C33 |
| 4 | 220PF 220pF | C_0603_1608Metric | C27, C28, C29, C30 |
| 2 | 3.3 pF | C_0603_1608Metric | C36, C37 |
| 2 | 6.8 pF | C_0603_1608Metric | C43, C45 |
| 2 | 220 pF | C_0603_1608Metric | C44, C47 |
| 3 | 4.7K 4.7k | R_0603_1608Metric | R2, R3, R14 |
| 3 | C25804 10k Ohm | R_0603_1608Metric | R5, R10, R11 |
| 2 | 5.1K 5.1k | R_0603_1608Metric | R6, R7 |
| 2 | 22 | R_0603_1608Metric | R8, R9 |
| 2 | C23179 470 Ohm | R_0603_1608Metric | R12, R13 |
WK-1 design files
The KiCad project lives in the zOnlyKroks/pcb-consortium repository on GitHub; these links point at the commit this page was built from.
WK-1: common questions
What microcontroller does the WK-1 use?
The WK-1 is built around the ESP32-S3-MINI-1U, from the ESP32 family.
How big is the WK-1 PCB?
The WK-1 measures 49.9 × 99.8 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the WK-1?
89 components, from 40 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 WK-1 design files?
From the zOnlyKroks/pcb-consortium 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 WK-1 design in my own project?
Yes, under the terms of its CC0-1.0 license, which zOnlyKroks chose for the repository.
Can I test firmware for the WK-1 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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