2 layers48.3 × 48.3 mm
Lora sensor
KolijnWolfaardt/TTN_sensor_node
An experimental sensor node for The Things Network.
82 parts
2 layers220 × 300 mm
Schematic and PCB for a circuit board map of Seattle area public transit.
- Size
- 220 × 300 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 448
- Nets
- 446
- Pads
- 1,772
- Tracks, vias
- 2,721, 757
- Pours
- 735
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 13 Mar 2026
- Updated
- 25 Aug 2026
Overview
Transit is an open-source printed circuit board by thebenedict, from the thebenedict/seattletransit-hardware repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 220 × 300 mm with 448 parts on 446 nets, routed with 2,721 tracks and 757 vias.
It is built around the ESP32-C3-MINI-1-H4X, BH1603FVC-TR and SN74LVC2T45DCURE4, with the TPU3013S5, USBLC6-2SC6 and WS2812B-2020 among its other parts. Its parts include 389 diodes, 18 resistors, 16 capacitors, 6 ICs and 3 connectors. It belongs with the ESP32 and RISC-V boards of this library.
Main components
9
ESP32-C3-MINI-1-H4X
SMD,16.6x13.2mm-104dBm -40℃~+105℃ 2.4GHz 20.5dBm 350mA 3V~3.6V 82mA ESP32-C3FH4 Integrated Bluetooth function On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD,16.6x13.2mm WiFi Modules ROHSEspressif SystemsWiFi Modules
BH1603FVC-TR
WSOF-6-40℃~+85℃ 1.6mm 2.4V~5.5V 3mm 9uA Light Intensity WSOF-6 Ambient Light Sensors ROHSROHM SemiconductorAmbient Light Sensors
SN74LVC2T45DCURE4
VSSOP-832mA 32mA Level translator Power-off protection、Output enable high-impedance VSSOP-8 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
TPU3013S5
SOT-23-5-40℃~+85℃ 1 2.9V~5.5V 3A 40mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Over Temperature Protection SOT-23-5 Power Distribution Switches ROHSTECH PUBLICPower Distribution Switches
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
WS2812B-2020
SMD,2.2x2mm0.6mA 0.84mm 120us 160mcd 200mcd 2kHz 2mm 2mm 300ns 470.4nm 515.6nm 520mcd 5V 622.5nm 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function Top-mount SMD,2.2x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
WS2812B-MINI-X2
SMD3535-4P0.6mA 0.95mm 2kHz 3.5V~5.3V 3.5mm 3.5mm 800Kbit/s B:215mcd、R:330mcd、G:700mcd R:620nm~625nm、B:467nm~472nm、G:515nm~520nm 内置上电复位电路、内置掉电复位电路、集成智能反向连接保护功能 SMD3535-4P RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
SMBJ6.0CA
DO-214AA(SMB)ESD And Surge Protection (TVS/ESD)hongjiacheng
README
README.mdSeattle Transit Live
Schematic and PCB for a circuit board map of Seattle area public transit.
This board uses an ESP32-C3 to drive 383 individually addressable WS2812 LEDs arranged as a stylized regional transit map. The LEDs are split across two chains, and represent live movement across rail, ferry, water taxi, and monorail routes.
Main Functionality
- Displays a physical transit map with addressable LEDs placed along the network.
- Uses an
ESP32-C3-MINI-1as the main controller. - Takes power and USB data over
USB-C. - Drives the LED chains through level shifting and a switchable LED power rail.
- Includes an ambient light sensor for auto-dimming in software.
Repo Contents
transit.kicad_sch,transit.kicad_pcb, and the sub-sheet.kicad_schfiles contain the Rev C schematic and PCB layout.production/contains fabrication outputs, BOM data, positions, and packaged manufacturing files.tools/contains scripts and transit GIS/GTFS inputs used to generate LED map configuration data.3d_views/andweb/public/contain renders and SVG exports of the board.
License
Hardware license: The hardware design files in this repository are licensed under the CERN Open Hardware Licence Version 2 — Weakly Reciprocal (CERN-OHL-W-2.0).
Parts
448| Qty | Value | Footprint | References |
|---|---|---|---|
| 369 | WS2812B-2020 | EasyEDA:LED-SMD_4P-L2.0-W2.0-TL_WS2812B-2020 | LED1001, LED1002, LED1003, LED1004, LED1005, LED1006, LED1007, LED1008, LED1009, LED1010, LED1011, LED1012, LED1013, LED1014, LED1102, LED1103 +353 |
| 14 | WS2812B-MINI-X2 | EasyEDA:LED-SMD_4P-L3.5-W3.5-TL_WS2812B-MINI-X2 | LED301, LED307, LED401, LED406, LED419, LED514, LED518, LED701, LED719, LED801, LED919, LED1015, LED1101, LED1110 |
| 5 | 100n | EasyEDA:C0603 | C1, C4, C10, C14, C15 |
| 5 | 10K | EasyEDA:R0603 | R1, R11, R12, R17, R18 |
| 5 | 5K1 | EasyEDA:R0603 | R2, R3, R6, R15, R16 |
| 5 | ~ | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4, H5 |
| 4 | 0R | EasyEDA:R0603 | R7, R8, R9, R10 |
| 4 | 10u | EasyEDA:C0805 | C2, C5, C6, C8 |
| 4 | 1u | EasyEDA:C0603 | C9, C12, C13, C16 |
| 3 | SW_SPST | EasyEDA:KEY-SMD_L6.2-W3.6-LS8.0_K2-1107ST-A4SW-06 | SW1, SW2, SW3 |
| 2 | 100R | EasyEDA:R0603 | R13, R14 |
| 2 | BLUE | EasyEDA:LED0805-R-RD | LED2, LED3 |
| 2 | SS34 | EasyEDA:D_SMA | D2, D3 |
| 2 | USB_C_Receptacle_USB2.0_16P | Transit:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1, J2 |
| 1 | +3V3 | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP2 |
| 1 | +VBUS | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP1 |
| 1 | +VLED | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP3 |
| 1 | 100K | EasyEDA:R0603 | R5 |
| 1 | 150u | EasyEDA:CAP-SMD_L3.5-W2.8 | C7 |
| 1 | 22u | EasyEDA:C0805 | C11 |
| 1 | 47K | EasyEDA:R0603 | R4 |
| 1 | 47u | EasyEDA:C0805 | C3 |
| 1 | 6V_3A | EasyEDA:F1210 | F1 |
| 1 | BH1603FVC-TR | EasyEDA:WSOF-6_L2.6-W1.6-P0.50-BL-EP | U5 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | ESP32-C3-MINI-1-H4X | PCM_Espressif:ESP32-C3-MINI-1 | U1 |
| 1 | FERRY | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP6 |
| 1 | GREEN | EasyEDA:LED0805-R-RD | LED1 |
| 1 | LED-5V-EN | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP4 |
| 1 | RAIL | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP7 |
| 1 | SMBJ6.0CA | EasyEDA:SMB_L4.3-W3.6-LS5.4-BI | D1 |
| 1 | SN74LVC2T45DCUR | EasyEDA:VSSOP-8_2.3x2mm_P0.5mm | U6 |
| 1 | TLV75733PDYDR | EasyEDA:Texas_DYD0005A_SOT-23-5-EP | U2 |
| 1 | TPU3013S5 | EasyEDA:SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BR | U4 |
| 1 | USBLC6-2SC6 | EasyEDA:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL | U3 |
| 1 | VBUS_RAW | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP5 |
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Questions
How big is the Transit PCB?
It measures 220 × 300 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Transit use?
448 parts, built around the ESP32-C3-MINI-1-H4X, BH1603FVC-TR, SN74LVC2T45DCURE4 and TPU3013S5. 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 Transit KiCad files?
From the thebenedict/seattletransit-hardware repository on GitHub, at the commit this page was made from: the board is transit.kicad_pcb and its schematic edmonds_kingston.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Transit design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).