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Room environment monitor

kevinlutzer·room-environment-monitor·pcb/room_environment_monitor.kicad_pcb

Room environment monitor PCB layout, top view — open source ESP32 board by kevinlutzer

About the Room environment monitor PCB

Room environment monitor is an open source ESP32 PCB design by kevinlutzer, published on GitHub. It is a 4-layer board measuring 35.5 × 74.5 mm, with 41 components from 22 distinct parts.

Its main chip is the ESP32-C3-WROOM-02, from the ESP32 family. Other key parts include the SGP30-2.5K, BME280 and AP2112K-3.3. By type, the board carries 17 resistors, 8 capacitors, 5 diodes, 4 ICs, 3 transistors and 3 connectors.

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

From the project

An IOT device built of the raspberry pi

The Room Environment Monitor (REM) project was something that I started back in 2017. I wanted a small IoT device that could tell me if there was a concerning amount of volatile organic compounds (VOCs) and CO2 in my workshop. I built the first version based on a Raspberry Pi Zero, CCS811 air quality monitor, and a BME280 humidity and temperature sensor.

I went through multiple iterations of the project with the overall objective to reduce cost while increasing the precision of the measurements being made. At that time, the CCS811 sensor cost about 40 dollars alone, which brought the V1 bill…

Room environment monitor, from the project README
From the project README

Main components on the Room environment monitor

ESP32-C3-WROOM-02SGP30-2.5KBME280AP2112K-3.3

Room environment monitor bill of materials (BOM)

41 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-WROOM-02
U1
1
SGP30-2.5K
SGP40
U3
1
BME280
U4
1
AP2112K-3.3
U5
2
BSS138
Q1, Q3
1
BSS138
Q2
1
CONN_01X02_PIN
Conn_01x02_Pin
J1
1
CONN_01X04_PIN
Conn_01x04_Pin
J2
1
USB_C_Plug_USB2.0
P1
1
SW_SPST
SW1
1
CDBMS160
D1
1
LED
D2
3
WS2812B-2020
D3, D4, D5
4
0U1
0u1
C2, C3, C4, C5
4
1u
C6, C7, C10, C11
5
10K
10k
R1, R3, R7, R12, R13
1
220
R2
1
4.7
R4
4
0
R5, R6, R8, R9
2
2K2
2k2
R10, R11
Show 2 more
QtyPartRefs
2
5.1K
5.1k
R15, R20
2
10k
R17, R18

Room environment monitor design files

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

Room environment monitor: common questions

What microcontroller does the Room environment monitor use?

The Room environment monitor is built around the ESP32-C3-WROOM-02, from the ESP32 family.

How big is the Room environment monitor PCB?

The Room environment monitor measures 35.5 × 74.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Room environment monitor?

41 components, from 22 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 environment monitor design files?

From the kevinlutzer/room-environment-monitor 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 environment monitor design in my own project?

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

Can I test firmware for the Room environment monitor 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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