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The Ultimate DIY Air Quality Monitor: Breathe Smarter, Live Healthier

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Are you truly aware of the air you breathe indoors every day? The air inside our homes and offices can be significantly more polluted than the air outside, impacting our health, focus, and overall well-being. It's time to stop guessing and start measuring.

Introducing the AirGuardian C3 Pro Kit – a powerful, compact, and fully open-source PCB designed for the ultimate DIY air quality station. Powered by the efficient ESP32-C3 controller and a suite of professional-grade sensors, this board gives you a complete, real-time picture of your environment, empowering you to create a healthier living space.

Precision Where It Matters Most: Generic VOC sensors often provide only a broad air quality index, missing specific compounds that can be harmful in certain environments. That’s why the AirGuardian C3 Pro includes a dedicated formaldehyde (CH₂O) sensor — a crucial advantage for 3D printing, laser cutting, or workshop setups. It instantly detects sharp spikes in emissions caused by different filament types or heated plastics, giving you real-time visibility into what’s really in the air. Whether you’re switching from PLA to ABS or experimenting with new materials, you’ll know immediately how your workspace air quality changes.

Why Choose the AirGuardian C3 Pro?

  • Comprehensive 7-in-1 Sensing: Why settle for one or two metrics? The AirGuardian C3 Pro measures everything that matters: Carbon Dioxide (CO2), Volatile Organic Compounds (VOCs), NOx Index, Particulate Matter (PM1.0, PM2.5, & PM10.0), Formaldehyde (CH2O), Temperature, Humidity, and Barometric Pressure.

  • Seamless Smart Home Integration: Built on the powerful ESPHome platform, this monitor integrates flawlessly with Home Assistant. Not a Home Assistant user? No problem! With built-in MQTT support, you can send data to any platform, dashboard, or database you choose.

  • Reliable & Rock-Solid: Designed with stability in mind, featuring robust power filtering with multiple decoupling capacitors and a dedicated voltage regulator. Set it up once and let it run for years.

  • Compact & Discreet: Its small form factor allows you to place it anywhere without clutter. The perfect foundation for a custom 3D-printed case that matches your home decor.

  • Fully Open & Customizable: You get the complete ESPHome configuration file. Tweak it, expand it, and make it your own. This is DIY at its best – powerful, flexible, and entirely under your control.

Technical Specifications & Connections

The AirGuardian C3 Pro is engineered for performance and ease of use for the electronics hobbyist and smart home enthusiast.

Core Components

  • Microcontroller: ESP32-C3 Super Mini Pro (Wi-Fi & Bluetooth LE)

  • Power: 5V DC input via standard pins.

  • Voltage Regulation: On-board AMS1117 regulator provides a clean 3.3V supply to the controller and sensors.

  • Power Filtering: Includes 10µF input, 22µF, and 100nF decoupling capacitors for exceptionally stable operation.

On-board Sensors

  • SCD40: True NDIR sensor for accurate Carbon Dioxide (CO2), Temperature, and Humidity.

  • SGP41: Measures Volatile Organic Compounds (VOC Index) and Nitrogen Oxides (NOx Index).

  • AHT20 + BMP280 Combo: A secondary sensor providing Temperature, Humidity, and precise Barometric Pressure.

  • PMS5003: Laser-based sensor for Particulate Matter (PM1.0, PM2.5, PM10.0).

  • ZE08-CH2O: Electrochemical sensor for Formaldehyde (CH2O) concentration.

 

Firmware

The device is designed to be flashed with ESPHome. We provide a complete, ready-to-use yaml configuration file to get you up and running in minutes. The firmware enables a local web server for viewing data without any smart home hub and publishes all sensor readings to MQTT for maximum compatibility.