4 layers37 × 34.3 mm
Readout 60pin
opentac/opentac
OpenTac: open tools to design, fabricate, read and simulate flex-PCB tactile skins that sense normal and shear force, for any robot surface.
55 parts92MIT
4 layers21.6 × 35.8 mm
DevBoard ESP32-rounded
toby-alpha/transparent-devboard1The Dev Board is based off the ESP32 C3 Mini module. It contains a USB-C port, power LED, user LED, 3x WS2812B 2020 Adressable LEDs, >6V voltage input, as well as all GPIO being broken out.
- Size
- 21.6 × 35.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 44
- Pads
- 168
- Tracks, vias
- 888, 67
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Jul 2025
- Updated
- 8 Jul 2025
Overview
DevBoard ESP32-rounded is an open-source printed circuit board by toby-alpha, from the toby-alpha/transparent-devboard repository on GitHub. It is a 4-layer board of 21.6 × 35.8 mm with 30 parts on 44 nets, routed with 888 tracks and 67 vias.
It is built around the AP2112K-3.3TRG1, XL-2020RGBC-WS2812B and TSA343G00D-250J2, with the BM04B-SRSS-TB(LF)(SN) and GT-USB-7058 among its other parts. Its parts include 8 resistors, 7 capacitors, 5 diodes, 3 connectors and 2 ICs. It belongs with the microcontroller boards boards and the ESP32 and RISC-V boards of this library.
Main components
5
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) RegulatorsXL-2020RGBC-WS2812B
SMD- LCDH ROHSXINGLIGHTUncategorised
TSA343G00D-250J2
SMD,4x3mm-25℃~+70℃ 12V 2.5N 2mm 3mm 4mm 50,000 cycles 50mA Black No Round Button SMD(SMT) Tab SPST Surface Mount,Vertical Without Bracket SMD,4x3mm Tactile Switches ROHSBRIGHTTactile Switches
BM04B-SRSS-TB(LF)(SN)
SMD,P=1mm-25℃~+85℃ 1 1A 1mm 1x4P 3.6mm 4 4.25mm 4P 50V 6mm Auxiliary Solder Pin Copper alloy PA SR Surface Mount,Vertical Tin UL94V-0 White SMD,P=1mm Wire To Board Connector ROHSJSTWire To Board Connector
GT-USB-7058
SMD-40℃~+85℃ 0.12mm 1 10,000 Cycles 16P 24V 5.4mm 5A Black Female Laminated board Type-C USB 2.0 SMD USB Connectors ROHSG-SwitchUSB Connectors
README
README.mdESP32-C3 Based (not so) Transparent Dev Board
- unforchantly due to manufacturing constraints, the transparent board has to come to an end.. (it was 300USD for 20 transparents). I'll look for ways to produce it after this, and probably persue it as a personal endeavor.*
The Dev Board is based off the ESP32 C3 Mini module. It contains a USB-C port, power LED, user LED, 3x WS2812B 2020 Adressable LEDs, >6V voltage input, as well as all GPIO being broken out. The USB-C connector is inline to conform to a slim profile. It also has a JST SH connector for i2C connections.
It's specially manufactured from a transparent FR4 material to give it's unique look.
Why I designed this?
I was really intrigued with the concept of a transparent PCB, after seeing a JLCPCB advertisement for it. This prompted me to create an ESP devboard, that would be useful in many scenarios, while also exploring this new technology. The PCB also serves as a great method of education, showing inside of the complex electronics.
BOM
| Item | Cost (AUD) | Cost (USD) | Source | Link |
|---|---|---|---|---|
| Components Parts | 45 | 29 | LCSC | PDF Quote Upon Request |
| Hot Plate | 34 | 22 | Aliexpress | https://www.aliexpress.com/item/1005008125355441.html |
| Misc (Solder Paste.. Etc) | 30 | 19.5 | Aliexpress | |
| PCB + Stencil | 15 | 9.75 | JLCPCB | |
| Total | 81 |
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2, C5, C6, C8 |
| 3 | XL-2020RGBC-WS2812B | EASYEDA2KICAD:LED-SMD_4P-L2.0-W2.0-BR-1 | LED1, LED2, LED3 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1, C3 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R2, R8 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R3 |
| 2 | Conn_01x09_Pin | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical | J1, J2 |
| 2 | TSA343G00D-250J2 | EASYEDA2KICAD:SW-SMD_L4.0-W2.9-P4.15-EH | SW1, SW2 |
| 1 | 100 | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | AP2112K-3.3TRG1 | EASYEDA2KICAD:SOT-25-5_L2.9-W1.6-P0.95-LS2.8-BL | U2 |
| 1 | BM04B-SRSS-TB(LF)(SN) | EASYEDA2KICAD:CONN-SMD_BM04B-SRSS-TB | CN1 |
| 1 | Blue LED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | ESP32-C3-MINI-1-H4(4MB) | EASYEDA2KICAD:WIFIM-SMD_ESP32-C3-MINI-1 | U1 |
| 1 | GT-USB-7058 | EASYEDA2KICAD:USB-C-SMD_GT-USB-7058 | USB1 |
| 1 | Green LED | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | LOGO | LOGO | G*** |
| 1 | SolderJumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
Questions
How big is the DevBoard ESP32-rounded PCB?
It measures 21.6 × 35.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the DevBoard ESP32-rounded use?
30 parts, built around the AP2112K-3.3TRG1, XL-2020RGBC-WS2812B, TSA343G00D-250J2 and BM04B-SRSS-TB(LF)(SN). 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 DevBoard ESP32-rounded KiCad files?
From the toby-alpha/transparent-devboard repository on GitHub, at the commit this page was made from: the board is KiCAD Files/DevBoard ESP32-rounded.kicad_pcb and its schematic KiCAD Files/DevBoard ESP32-rounded.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DevBoard ESP32-rounded design in my own project?
Its repository states no licence, so its author keeps all rights: ask toby-alpha before reusing the design.
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