HardLabs

Mystery box

cosmiccableltd·mystery-box·ver3/mystery_box-v3.kicad_pcb

Mystery box PCB layout, top view — open source ESP32 board by cosmiccableltd

About the Mystery box PCB

Mystery box is an open source ESP32 PCB design by cosmiccableltd, published on GitHub. It is a 2-layer board measuring 136 × 100 mm, with 61 components from 25 distinct parts.

Its main chip is the ESP32-S3-Zero, from the ESP32 family. Other key parts include the THVD1400D. By type, the board carries 14 connectors, 8 resistors, 5 LEDs, 5 diodes, 3 transistors and 3 switches.

From the project

PCB to visiual analogue telephone ringing

Mystery box, from the project README
From the project README

Main components on the Mystery box

THVD1400D

Mystery box bill of materials (BOM)

61 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
THVD1400D
U1
3
IRLZ44N
Q1, Q2, Q3
11
Screw_Terminal_01x02
J1, J8, J9, J10, J11, J12, J13, J14 +3
1
SERIAL1
J3
1
BARREL+AF8-JACK+AF8-MOUNTINGPIN
Barrel_Jack_MountingPin
J18
1
RJ45+AC0-CC+AC0-X2+AC0-ALIEXPRESS
rj45-CC-X2-Aliexpress
J20
1
M2
5V-Buck-Converter1
1
M1
24V-Boost-Converter1
4
Screw_Terminal_01x03
DMX_T1, NEO_T1, NEO_T2, NEO_T3
1
XLR3
DMX_XLR1
1
~
ESP32_S3
6
Conn_01x03_Pin
GPIO_CONN1, JMP_BUCK_PWR1, JMP_NEO1_PWR1, JMP_NEO2_PWR1, JMP_NEO3_PWR1, JMP_POE1
3
Screw_Terminal_01x02
GPIO_T1, GPIO_T2, GPIO_T3
2
Conn_01x02_Pin
JMP_5V_USB-BUCK1, PWR_12V_FAN1
3
Screw_Terminal_01x02
SW01, SW02, SW03
1
U3
SmartSwitch1
2
LED
LED_12V1, LED_12V_SW1
3
WS2812B
NEOPIXEL1, NEOPIXEL2, NEOPIXEL3
3
D
D1, D2, D3
1
1N914
D4
Show 5 more
QtyPartRefs
1
D_Zener
D5
2
100nF
C1, C2
3
100
R1, R2, R4
2
1k
R3, R9
3
10k
R6, R7, R8

Mystery box design files

The KiCad project lives in the cosmiccableltd/mystery-box repository on GitHub; these links point at the commit this page was built from.

Mystery box: common questions

What microcontroller does the Mystery box use?

The Mystery box is built around the ESP32-S3-Zero, from the ESP32 family.

How big is the Mystery box PCB?

The Mystery box measures 136 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mystery box?

61 components, from 25 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Mystery box design files?

From the cosmiccableltd/mystery-box repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Mystery box design in my own project?

The repository has no license, so all rights stay with cosmiccableltd. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Mystery box without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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