Kami hardware
About the Kami hardware PCB
Kami hardware is an open source ESP32 PCB design by Nicolai-Electronics, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 95 × 86 mm, with 100 components from 38 distinct parts.
Its main chip is the ESP32-WROVER-E, from the ESP32 family. Other key parts include the 74LVC1G17GW,125, MPR121QR2, TPS63020DSJR, XT4054K421MR-G and SY6280AAC. By type, the board carries 37 resistors, 30 capacitors, 15 ICs, 5 connectors, 5 diodes and 4 transistors.
From the project
Kami is a modernized re-imagining of the SHA2017 epaper badge by Badge.Team.
Kami is a modernized re-imagining of the SHA2017 epaper badge by Badge.Team.
Need the schematic? It's in this repository as a PDF file.
This hardware design may be used under the terms of the CERN-OHL-P license.
Main components on the Kami hardware
Kami hardware bill of materials (BOM)
100 components, 38 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LVC1G17GW,125 | SOT-353_SC-70-5 | U1 |
| 1 | MPR121QR2 | UQFN-20_3x3mm_P0.4mm | U2 |
| 1 | ESP32-WROVER-E | ESP32-WROVER-E | U3 |
| 1 | TPS63020DSJR | VSON-14_L4.0-W3.0-P0.50-BL-EP_TI_DSJ | U4 |
| 1 | XT4054K421MR-G | SOT-23-5 | U5 |
| 1 | SY6280AAC | SOT-23-5 | U6 |
| 1 | CH340K | SSOP-10-1EP_3.9x4.9mm_P1mm_EP2.1x3.3mm | U7 |
| 6 | SK6805 | SK6805-EC20 | U8, U11, U12, U13, U14, U15 |
| 2 | SY6280AAC Silergy Corp | SOT-23-5 | U9, U10 |
| 2 | AP2302B | SOT-23 | Q2, Q3 |
| 2 | AO3400 (A09T) | SOT-23 | Q4, Q5 |
| 1 | QWIIC | Qwiic 1X04_1MM_RA_GND | J1 |
| 1 | Micro_SD_Card | SD_Card-micro_socket_A | J2 |
| 1 | USB-C | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J6 |
| 1 | Battery | JST_S2B-ZR-SM4A-TF(LF)(SN) | J9 |
| 1 | E-Paper | Hirose_FH12-24S-0.5SH_1x24-1MP_P0.50mm_Horizontal | J10 |
| 1 | 1A | Fuse_0805_2012Metric | F1 |
| 1 | SW_SPDT | SW_SPDT_PCM12_MP | SW6 |
| 5 | NSR0320MW2T1G | D_SOD-323 | D23, D24, D25, D26, D27 |
| 1 | CMLW6028S1R5MST | IND-SMD_L6.0-W6.0 | L1 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 47u | L_1210_3225Metric | L2 |
| 10 | 100n | C_0402_1005Metric | C1, C2, C3, C8, C12, C23, C24, C25 +2 |
| 6 | 22u | C_0805_2012Metric | C4, C5, C7, C9, C26, C27 |
| 4 | 10u | C_0805_2012Metric | C6, C10, C11, C28 |
| 8 | 1u | C_0603_1608Metric | C13, C14, C16, C17, C18, C19, C20, C21 |
| 1 | 4.7u | C_0603_1608Metric | C15 |
| 1 | 470n | C_0603_1608Metric | C22 |
| 1 | 75k | R_0402_1005Metric | R1 |
| 15 | 10k | R_0402_1005Metric | R2, R6, R7, R14, R17, R18, R19, R20 +7 |
| 7 | 100k | R_0402_1005Metric | R4, R23, R24, R30, R31, R32, R35 |
| 2 | 45.3k | R_0402_1005Metric | R5, R8 |
| 5 | 4.7k | R_0402_1005Metric | R10, R13, R27, R28, R33 |
| 1 | 1M | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R11 |
| 1 | 180k | R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R12 |
| 2 | 5.1k | R_0402_1005Metric | R15, R16 |
| 1 | 2k | R_0402_1005Metric | R25 |
| 1 | 1k | R_0402_1005Metric | R29 |
| 1 | 2.2 | R_0805_2012Metric | R34 |
Kami hardware design files
The KiCad project lives in the Nicolai-Electronics/kami-hardware repository on GitHub; these links point at the commit this page was built from.
- Layoutkami.kicad_pcb
- Schematickami.kicad_sch
Kami hardware: common questions
What microcontroller does the Kami hardware use?
The Kami hardware is built around the ESP32-WROVER-E, from the ESP32 family.
How big is the Kami hardware PCB?
The Kami hardware measures 95 × 86 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Kami hardware?
100 components, from 38 distinct parts. The full bill of materials is listed on this page.
Where can I download the Kami hardware design files?
From the Nicolai-Electronics/kami-hardware repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Kami hardware design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which Nicolai-Electronics chose for the repository.
Can I test firmware for the Kami hardware 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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