HardLabs

Room

Jerzeek·room-pcb·pcb/room-pcb.kicad_pcb

Room PCB layout, top view — open source ESP32 board by Jerzeek
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About the Room PCB

Room is an open source ESP32 PCB design by Jerzeek, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 50 × 55 mm, with 24 components from 16 distinct parts.

Its main chip is the ESP32-C6_SUPERMINI_TH, from the ESP32 family. Other key parts include the COZIR, BH1750FVI and AHT20. By type, the board carries 5 connectors, 4 ICs, 4 capacitors, 4 resistors, 3 test points and 2 diodes.

It belongs with the iot & wireless and sensors designs in this gallery.

From the project

An open-source, mains-powered room sensor PCB based on the ESP32-C6. Measures CO2, temperature, humidity, illuminance, and presence, with a WS2812B LED status indicator. Supports both ESPHome (Wi-Fi / Home Assistant) and Zigbee firmware out of the box.

An open-source, mains-powered room sensor PCB based on the ESP32-C6. Measures CO2, temperature, humidity, illuminance, and presence, with a WS2812B LED status indicator. Supports both ESPHome (Wi-Fi / Home Assistant) and Zigbee firmware out of the box.

- Direct mains AC input via onboard HLK-5M05 AC-DC converter (no external power brick needed) - CO2, temperature, and humidity via CozIR sensor (NDIR CO2, UART) - Ambient light via BH1750 (I2C, lux) - Secondary temperature + humidity via AHT20 (I2C) - Presence/occupancy detection via LD2410 mmWave radar (UART) - Visual CO2 status indicator: 2×…

Main components on the Room

COZIRBH1750FVIAHT20ESP32-C6_SUPERMINI_TH

Room bill of materials (BOM)

24 components, 16 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
COZIR
U1
1
BH1750FVI
BH1750FVI-TR
U2
1
AHT20
U3
1
ESP32-C6_SUPERMINI_TH
U5
1
CONN_01X02
Conn_01x02
J2
1
CONN_01X04
Conn_01x04
J3
1
CONN_01X05
Conn_01x05
J4
2
CONN_01X04
Conn_01x04
J5, J6
1
Polyfuse
F1
1
HLK-5M05
PS1
3
TestPoint
TP1, TP2, TP3
2
WS2812B
D1, D2
1
1U
C1
3
0.1U
C4, C5, C6
1
1K
R1
3
10K
R5, R6, R7

Room design files

The KiCad project lives in the Jerzeek/room-pcb repository on GitHub; these links point at the commit this page was built from.

Room: common questions

What microcontroller does the Room use?

The Room is built around the ESP32-C6_SUPERMINI_TH, from the ESP32 family.

How big is the Room PCB?

The Room measures 50 × 55 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Room?

24 components, from 16 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 Room design files?

From the Jerzeek/room-pcb 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 Room design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which Jerzeek chose for the repository.

Can I test firmware for the Room 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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