2 layers66 × 55.9 mm
4 layers39 × 40 mm
Kicad keybridge v2
abdalrahimnaser/keybridge-pcb28USB adapter board for Home Assistant
- Size
- 39 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 52
- Pads
- 159
- Tracks, vias
- 203, 82
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 Oct 2026
- Updated
- 18 Oct 2026
Overview
Kicad keybridge v2 is an open-source printed circuit board by abdalrahimnaser, from the abdalrahimnaser/keybridge-pcb repository on GitHub. It is a 4-layer board of 39 × 40 mm with 33 parts on 52 nets, routed with 203 tracks and 82 vias.
It is built around the ESP32-S2-MINI-2-N4, AP2112K-3.3TRG1 and LESD5D5.0CT1G, with the AF180QT1.0 and USB-TYPE-C-009 among its other parts. Its parts include 11 capacitors, 10 resistors, 4 diodes, 3 ICs and 3 connectors. It belongs with the ESP32 boards of this library.
Main components
5
ESP32-S2-MINI-2-N4
SMD-40℃~+105℃ -97dBm 19.5dBm 2.4GHz 310mA 3V~3.6V 63mA ESP32-S2FH4 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD WiFi Modules ROHSEspressif SystemsWiFi Modules
AP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LESD5D5.0CT1G
SOD-523-55℃~+150℃ 100W 12pF 16V 1uA 5V 7A 7V Bidirectional ESD IEC 61000-4-2 SOD-523 ESD and Surge Protection (TVS/ESD) ROHSGOODWORKUncategorised
AF180QT1.0
SMD-25℃~+85℃ 1 1.5A 13.8mm 30V 4P 5 thousand cycles Beige Female Surface Mount, Right Angle Type-A USB 2.0 SMD USB Connectors ROHSSHOU HANUSB Connectors
USB-TYPE-C-009
SMD-25℃~+85℃ 1 10000 times 5A 5V 6.8mm 6P Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSDEALONUSB Connectors
README
README.mdGet yourself a premade KeyBridge here: https://localdevices.net/products/keybridge
Link to the software repo: https://github.com/abdalrahimnaser/keybridge-esphome
License
This hardware design is licensed under CC BY-NC-SA 4.0. You are free to build and modify it for personal, non-commercial use. Commercial manufacturing and sales are prohibited without prior written permission.
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1u/50V (10%) | Capacitor_SMD:C_0805_2012Metric | C9, C10, C13 |
| 3 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6, R7, R8 |
| 3 | LESD5D5.0CT1G | EasyEDA:SOD-523_L1.2-W0.8-LS1.6-BI | D1, D3, D4 |
| 2 | 10u/25V (10%) | Capacitor_SMD:C_0805_2012Metric | C5, C12 |
| 2 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R5 |
| 2 | 1u/50V (10%) | Capacitor_SMD:C_0805_2012Metric | C4, C14 |
| 2 | 22R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11, R12 |
| 2 | 4.7n/1kV (10%) | Capacitor_SMD:C_1206_3216Metric | C1, C7 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3 |
| 2 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2 |
| 1 | 1.27mm IDC | EasyEDA:CONN-SMD_6P-P1.27-LS5.8 | CN3 |
| 1 | 120u/35V (20%) | Capacitor_SMD:CP_Elec_6.3x7.7 | C11 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R4 |
| 1 | 4.7u/25V (10%) | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | AF180QT1.0 | EasyEDA:USB-A-SMD_AF180QT1.0 | CN2 |
| 1 | AP2112K-3.3TRG1 | EasyEDA:SOT-25-5_L2.9-W1.6-P0.95-LS2.8-BL | U2 |
| 1 | AP2151WG-7 | EasyEDA:SOT-25-5_L3.0-W1.8-P0.95-LS3.0-BR | U3 |
| 1 | ESP32-S2-MINI-2-N4 | EasyEDA:WIFI-SMD_ESP32-MINI-1-N4 | U1 |
| 1 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | USB-TYPE-C-6P_Power | EasyEDA:TYPE-C-SMD_TYPE-C-6P | CN1 |
Questions
How big is the Kicad keybridge v2 PCB?
It measures 39 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Kicad keybridge v2 use?
33 parts, built around the ESP32-S2-MINI-2-N4, AP2112K-3.3TRG1, LESD5D5.0CT1G and AF180QT1.0. 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 Kicad keybridge v2 KiCad files?
From the abdalrahimnaser/keybridge-pcb repository on GitHub, at the commit this page was made from: the board is kicad_keybridge_v2.kicad_pcb and its schematic kicad_keybridge_v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Kicad keybridge v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask abdalrahimnaser before reusing the design.
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