HardLabs

Air quality sensor

roepkefeller·air-quality-sensor·hardware/pcb/air_quality_sensor/air_quality_sensor.kicad_pcb

Air quality sensor PCB layout, top view — open source ESP32 board by roepkefeller
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About the Air quality sensor PCB

Air quality sensor is an open source ESP32 PCB design by roepkefeller, published on GitHub. It is a 4-layer board measuring 50.8 × 45 mm, with 75 components from 39 distinct parts.

Its main chip is the ESP32-C3-WROOM-02, from the ESP32 family. Other key parts include the TLV62569A, SHT40, BMP280, TPD2EUSB30 and SCD41. By type, the board carries 34 capacitors, 17 resistors, 9 ICs, 4 inductors, 3 jumpers and 3 diodes.

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

From the project

DIY air quality monitor: ESP32-C3, 4 Sensirion/Bosch sensors, custom 4-layer PCB, ESPHome firmware with Home Assistant integration.

A DIY open-source air quality monitor built around an ESP32-C3-WROOM-02, featuring a custom 4-layer PCB with four Sensirion/Bosch sensors, a laser-cut glass top panel, and a 3D-printed holder. Firmware runs on ESPHome and integrates natively with Home Assistant. An optional PMSA003I particulate matter add-on connects via the onboard QWIIC connector to add PM1.0, PM2.5, PM10, and EPA AQI measurements.

Air quality sensor, from the project README
From the project README

Main components on the Air quality sensor

TLV62569ASHT40BMP280TPD2EUSB30SCD41SGP41TPS7A20ESP32-C3-WROOM-02TLV75533P

Air quality sensor bill of materials (BOM)

75 components, 39 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TLV62569A
U1
1
SHT40
U2
1
BMP280
U3
1
TPD2EUSB30
U4
1
SCD41
U5
1
SGP41
U6
1
TPS7A20
U7
1
ESP32-C3-WROOM-02
U8
1
TLV75533P
U9
1
USB4110
J1
1
QWIIC Connector
J2
1
PPTC 8V 750mA
F1
3
0/1%
JP1, JP2, JP3
2
Push_Button
SW1, SW2
1
ESDALC5
D1
1
LED 0603 red
D2
1
WS2812
D3
2
1k@100MHz
FB1, FB3
1
1k@100MHz
FB2
1
1uH/20%/9.6A
L1
Show 19 more
QtyPartRefs
1
4.7µ/10V/X5R
C1
11
100N/10V/X5R
100n/10V/X5R
C2, C3, C5, C12, C13, C21, C22, C25 +3
3
10P/10V/C0G
10p/10V/C0G
C4, C9, C10
2
22µ/10V/X5R
C6, C29
12
1µ/10V/X5R
C7, C8, C11, C17, C18, C19, C20, C24 +4
2
47µ/10V/X5R
C14, C27
1
100µ/16V
C15
1
1µ/10V/X5R
C16
1
47u/16V/20%
C23
2
4.7k/1%
R1, R2
2
22/1%
R3, R9
2
5.1k/1%
R4, R5
1
270k/1%
R6
1
180k/1%
R7
1
100k/1%
R8
2
330/1%
R10, R12
1
36/1%
R11
1
0/1%
R13
4
10k/1%
R14, R15, R18, R19

Air quality sensor design files

The KiCad project lives in the roepkefeller/air-quality-sensor repository on GitHub; these links point at the commit this page was built from.

Air quality sensor: common questions

What microcontroller does the Air quality sensor use?

The Air quality sensor is built around the ESP32-C3-WROOM-02, from the ESP32 family.

How big is the Air quality sensor PCB?

The Air quality sensor measures 50.8 × 45 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Air quality sensor?

75 components, from 39 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 Air quality sensor design files?

From the roepkefeller/air-quality-sensor 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 Air quality sensor design in my own project?

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

Can I test firmware for the Air quality sensor 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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