4 layers68.1 × 75 mm
2 layers
Airquality sensor
frodegill/airsensorPCB and Arduino code for custom air quality sensor
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 54
- Pads
- 138
- Tracks, vias
- 203, 49
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Feb 2026
- Updated
- 25 Feb 2026
Overview
Airquality sensor is an open-source printed circuit board by frodegill, from the frodegill/airsensor repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board with 22 parts on 54 nets, routed with 203 tracks and 49 vias.
It is built around the ESP32-C6-WROOM-1-N8, AM2302 and MQ-2, with the 74HC4051, AMS1117-3.3 and MQ-6 among its other parts. Its parts include 7 resistors, 6 connectors, 5 switches and 4 ICs. It belongs with the sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
6
ESP32-C6-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -99.2dBm 2.4GHz 20.5dBm 382mA 3V~3.6V 78mA ESP32-C6 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
AM2302
插件0%RH~99.9%RH 16bit 3.3V~5.5V 300uA Single-bus ±0.5℃ ±2%RH SIP-4 Temperature and Humidity Sensor ROHSAosong ElecTemperature And Humidity Sensor
MQ-2
插件多气体检测能力 插件 Gas Sensors ROHSZhengzhou Winsen Elec TechGas Sensors
74HC4051
SOP-16-40℃~+85℃ 1 170MHz 28ns 29ns 3V~9V 5ns 5pF 80Ω 8:1 SOP-16 Analog Switches, Multiplexers ROHSWuxi I-core ElecAnalog Switches, Multiplexers
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsMQ-6
-- Lack of specifications ROHSZhengzhou Winsen Elec TechUncategorised
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10K | Resistor_SMD:R_1206_3216Metric | R3, R7 |
| 2 | 5K1 | Resistor_SMD:R_1206_3216Metric | R5, R6 |
| 1 | 1.8K | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 1K | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | 47K | Resistor_SMD:R_1206_3216Metric | R4 |
| 1 | 74HC4051 | custom_footprints:74HC4051D | U5 |
| 1 | AM2302 | Sensor:ASAIR_AM2302_P2.54mm_Vertical | U1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | BOOT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | ESP32-C6-WROOM-1 | espressif:ESP32-C6-WROOM-1 | U4 |
| 1 | KY018 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | LCD | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | MQ-135 | custom_footprints:MQ-x | S3 |
| 1 | MQ-2 | custom_footprints:MQ-x | S5 |
| 1 | MQ-6 | custom_footprints:MQ-x | S4 |
| 1 | MQ-8 | custom_footprints:MQ-x | S1 |
| 1 | MQ-9 | custom_footprints:MQ-x | S2 |
| 1 | RESET | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Setup | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_Amphenol_12401610E4-2A | J3 |
Questions
What parts does the Airquality sensor use?
22 parts, built around the ESP32-C6-WROOM-1-N8, AM2302, MQ-2 and 74HC4051. 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 Airquality sensor KiCad files?
From the frodegill/airsensor repository on GitHub, at the commit this page was made from: the board is airquality_sensor/airquality_sensor.kicad_pcb and its schematic airquality_sensor/airquality_sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Airquality sensor design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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