2 layers74 × 83.8 mm PCB Board, the printed circuit board in 3D

PCB Board

ReactPod: ESP32-C3 reaction buzzers – firmware, Config App (PWA), tools, hardware

Size: 74 × 83.8 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 70
Nets: 51
Pads: 262
Tracks, vias: 548, 71
Pours: 2
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 3 Mar 2024
Updated: 7 Nov 2026

Overview

PCB Board is an open-source printed circuit board by RunningJoke, from the RunningJoke/reactionButton repository on GitHub. It is a 2-layer board of 74 × 83.8 mm with 70 parts on 51 nets, routed with 548 tracks and 71 vias.

It is built around the ESP32-C3-WROOM-02-H4, TP4057 and SK6812, with the PTS645, 150040BS73220 and 150040VS73220 among its other parts. Its parts include 21 diodes, 16 resistors, 15 capacitors, 7 switches and 3 ICs. It belongs with the ESP32 and RISC-V boards of this library.

Main components

README

README.md

ReactPod

Reaction buzzers for training: an ESP32-C3 pod with an 18-LED ring and one big button. Several pods form a set; one pod is the central and runs the game program, the others are peripherals. Programs are JSON block graphs; the Config App builds, simulates and uploads them.

Config App: https://runningjoke.github.io/reactionButton/ (PWA, works offline, demo pod built in)
User manual, coach guide, game modes (en / de): wiki
Developing: CLAUDE.md (map, commands, workflow, rules) and the specs in docs/

pio run -d firmware -e NewBoard -t upload      # flash over USB (first install, recovery); later versions: Config App, This set (ADR 0009)
pio run -d firmware -e NewBoard -t uploadfs    # flash the programs
python tools/reactpod_serial.py monitor        # log over USB
cd app && npm install && npm run dev           # http://localhost:5173

In VS Code open reactpod.code-workspace so PlatformIO finds the firmware.

Parts

Qty	Value	Footprint	References
18	SK6812	LED_SMD:LED_SK6812_PLCC4_5.0x5.0mm_P3.2mm	D4, D5, D6, D7, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21 +2
12	C1uF	Capacitor_SMD:C_0402_1005Metric	C1, C3, C7, C8, C9, C10, C11, C13, C14, C15, C16, C17
7	R10K	Resistor_SMD:R_0402_1005Metric	R1, R4, R5, R10, R12, R13, R16
6	PTS645	Button_Switch_SMD:SW_SPST_PTS645	SW1, SW2, SW3, SW4, SW5, SW6
4	R100K	Resistor_SMD:R_0402_1005Metric	R6, R7, R8, R9
3	MountingHole_Pad	MountingHole:MountingHole_3.2mm_M3_DIN965_Pad_TopBottom	H2, H3, H4
2	C10uF	Capacitor_SMD:C_0402_1005Metric	C2, C5
2	R5.1k	Resistor_SMD:R_0402_1005Metric	R2, R3
1	150040BS73220	LED_SMD:LED_0402_1005Metric	D3
1	150040VS73220	LED_SMD:LED_0402_1005Metric	D2
1	BSS138	Package_TO_SOT_SMD:SOT-23	Q2
1	C2.2uF	Capacitor_SMD:C_0402_1005Metric	C4
1	ESP32-C3-WROOM-02	RF_Module:ESP32-C3-WROOM-02	U1
1	FDN340P	Package_TO_SOT_SMD:SOT-23	Q1
1	NDS331N	Package_TO_SOT_SMD:SOT-23	Q3
1	R2K	Resistor_SMD:R_0402_1005Metric	R15
1	R330	Resistor_SMD:R_0402_1005Metric	R11
1	R470	Resistor_SMD:R_0402_1005Metric	R14
1	S2B-PH-K-S	Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal	J2
1	SLW-1277545-3A-RA-N-D	Button_Switch_THT:SW_Slide_SPDT_Angled_CK_OS102011MA1Q	SW7
1	SS14	Diode_SMD:D_SMA	D1
1	TLV75533PDYDR	Package_TO_SOT_SMD:SOT-23-5	U2
1	TP4057	Package_TO_SOT_SMD:TSOT-23-6	U3
1	USB4105	Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal	J1

Questions

How big is the PCB Board PCB?

It measures 74 × 83.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the PCB Board use?

70 parts, built around the ESP32-C3-WROOM-02-H4, TP4057, SK6812 and PTS645. 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 PCB Board KiCad files?

From the RunningJoke/reactionButton repository on GitHub, at the commit this page was made from: the board is hardware/pcb/PCB Board/PCB Board.kicad_pcb and its schematic hardware/pcb/PCB Board/PCB Board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the PCB Board design in my own project?

Its repository states no licence, so its author keeps all rights: ask RunningJoke before reusing the design.

Category and platform

ESP32 RISC-V

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/runningjoke-reactionbutton" title="PCB Board in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/runningjoke-reactionbutton.jpg" alt="PCB Board" width="1200" height="900">

A picture that opens the board, for a README

[![PCB Board](https://pcbkit.io/embed/boards/runningjoke-reactionbutton.jpg?size=s)](https://pcbkit.io/boards/runningjoke-reactionbutton)

Source

Repository: RunningJoke/reactionButton
Board file: hardware/pcb/PCB Board/PCB Board.kicad_pcb
Commit: 752e33c
Homepage: runningjoke.github.io/reactionButton
Licence: Not stated

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