2 layers62 × 117 mm
Open squib esp wroom
chromalock/OpenSquib
Open-Sourced implementation of a PCB-Based Squib
29 parts17CC0-1.0
2 layers92 × 73.1 mm
Open squib esp wroom v2
chromalock/OpenSquib17Open-Sourced implementation of a PCB-Based Squib
- Size
- 92 × 73.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 38
- Pads
- 113
- Tracks, vias
- 208, 205
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.99 (file 20250401)
- Created
- 10 Oct 2024
- Updated
- 8 Sep 2025
Overview
Open squib esp wroom v2 is an open-source printed circuit board by chromalock, from the chromalock/OpenSquib repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 92 × 73.1 mm with 37 parts on 38 nets, routed with 208 tracks and 205 vias.
It is built around the ESP-WROOM-02, SI2302CDS and SI2305. Its parts include 13 resistors, 5 capacitors, 5 diodes, 4 switches and 3 transistors.
Main components
3
ESP-WROOM-02
SMD-18P-40℃~+85℃ -98dBm 170mA 2.4GHz 2.7V~3.6V 20dBm 50mA、56mA ESP8266EX On-board PCB Antenna UART、SPI、I2C、GPIO、PWM、I2S SMD-18P WiFi Modules ROHSEspressif SystemsWiFi Modules
SI2302CDS
SOT-231 N-channel 2.9A 20V 3.5nC@10V,4.5V 550mW 75mΩ@2.5V 850mV N-Channel SOT-23 MOSFETs ROHSVishay IntertechnologyMOSFETsSI2305
SOT-23-55℃~+150℃ 1 P-Channel 12V 15nC@4.5V 290pF 350mW 4.1A 45mΩ@4.5V 740pF 900mV SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
README
README.mdOpenSquib
Open-Source implementation of an ESP-WROOM-02 based squib, originally designed by William Osman and his team of crackhead engineers for the Mr. Beast Squid Game video.
I do not claim to be the inventor nor the original designer of this PCB; I have only reverse-engineered the portrayed functionality, documented the project, and made changes for accessibility and improved stability.
Due to the original schematics not being known, many components have been determined via educated guess, such as the power MOSFET, boost converter, and passive components.
Explanation Video
Inspiration (youtube)
Project Structure
app contains the code for a client-side application that allows you to remotely detonate a squib.
server contains the server code that communicates with all the squibs on the network.
firmware contains the code that runs on the ESP-WROOM-02D module.
pcb contains schematics and hardware designs for the PCB.
docs contains documentation and tutorials.
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R4, R5, R6, R8, R9, R10 |
| 5 | 1k | Resistor_SMD:R_0603_1608Metric | R1, R2, R11, R12, R13 |
| 3 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C5 |
| 2 | SI2302CDS | Package_TO_SOT_SMD:SOT-23-3 | Q1, Q3 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 12BH321P-GR | 12BH321P-GR:12BH321PGR | BAT1 |
| 1 | 1339345-1 | 1339345-1:13393451 | J2 |
| 1 | 22uF | Capacitor_SMD:C_1206_3216Metric | C1 |
| 1 | 4.7uH | Inductor_SMD:L_1210_3225Metric | L1 |
| 1 | BOOT | TS04_66_55_BK_100_SMT:SW_TS04-66-55-BK-100-SMT | SW3 |
| 1 | CONFIG | TS04_66_55_BK_100_SMT:SW_TS04-66-55-BK-100-SMT | SW4 |
| 1 | CONT | LED_SMD:LED_0603_1608Metric | D5 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | Conn_01x07_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J1 |
| 1 | ESP-WROOM-02 | RF_Module:ESP-WROOM-02 | U2 |
| 1 | MCP1642B-33I_MS | MCP1642B-33I_MS:SOP65P490X110-8N | U1 |
| 1 | POWER | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | PWR | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | SW1 |
| 1 | RESET | TS04_66_55_BK_100_SMT:SW_TS04-66-55-BK-100-SMT | SW2 |
| 1 | RPP | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | SI2305 | Package_TO_SOT_SMD:SOT-23-3 | Q2 |
| 1 | TRIG | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | ~{ARMED} | LED_SMD:LED_0603_1608Metric | D2 |
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Questions
How big is the Open squib esp wroom v2 PCB?
It measures 92 × 73.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Open squib esp wroom v2 use?
37 parts, built around the ESP-WROOM-02, SI2302CDS and SI2305. 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 Open squib esp wroom v2 KiCad files?
From the chromalock/OpenSquib repository on GitHub, at the commit this page was made from: the board is pcb/open_squib_esp_wroom_v2/open_squib_esp_wroom_v2.kicad_pcb and its schematic pcb/open_squib/open_squib_xiao.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Open squib esp wroom v2 design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).