CanAirIO
Open-source firmware for ESP32-based air quality sensors, enabling citizen science monitoring of PM2.5 and CO2 levels.
What is CanAirIO?
CanAirIO Firmware is an open-source software package that transforms low-cost ESP32 microcontroller boards into functional air quality sensors. It reads data from attached PM2.5 or CO2 sensors and transmits it via WiFi or Bluetooth, enabling the creation of a distributed network for environmental monitoring. The project addresses the need for affordable, community-owned air quality data.
Citizen scientists, environmental activists, makers, and IoT developers interested in building or deploying low-cost, open-source air quality monitoring stations.
Developers choose CanAirIO for its strong focus on community, extensive hardware compatibility, and ease of use through features like a web installer and OTA updates. It provides a complete, ready-to-deploy solution that is more accessible and customizable than proprietary environmental monitoring systems.
Overview
CanAirIO is a citizen science initiative. We are developing a mobile application that is able to set a PM2.5 or CO2 sensors, and other related sensors, as a fixed station using WiFi or mobile station with an smartphone by using a Bluetooth connection.
Use Cases
Best For
- Building a personal mobile air quality sensor for biking or walking
- Deploying a network of fixed air quality stations in a neighborhood or city
- Integrating real-time PM2.5/CO2 data into a Home Assistant smart home setup
- Educational projects or workshops about environmental sensing and citizen science
- Prototyping low-cost IoT environmental monitoring devices
- Contributing to open-source citizen science data collection initiatives
Not Ideal For
- Projects requiring industrial-grade sensor accuracy for regulatory compliance or scientific research
- Deployments in areas with unreliable or no WiFi/Bluetooth connectivity for data transmission
- Users seeking a fully assembled, commercial off-the-shelf product with zero setup or technical knowledge
- Applications needing advanced on-device data processing, real-time analytics, or machine learning capabilities
Pros & Cons
Pros
The project features a browser-based installer that allows flashing firmware directly from Chrome or Edge, simplifying initial setup without requiring complex development tools.
Supports over 15 ESP32 board variants and multiple PM2.5/CO2 sensors via a modular sensor library, as detailed in the extensive boards table in the README.
Includes over-the-air firmware updates with stable and testing channels, enabling remote maintenance and easy access to new features without physical intervention.
Integrates with platforms like Home Assistant and Anaire Cloud, and encourages contributions through a active Telegram group and open documentation, fostering a collaborative ecosystem.
Cons
The README explicitly states the CanAirIO Android app is currently down, limiting Bluetooth-based mobile functionality and GPS tagging until it's restored, which affects core features.
While the web installer is user-friendly, alternative methods like PlatformIO compilation or Docker require technical knowledge, additional software installation, and command-line expertise, posing barriers for non-developers.
Designed for affordability, the project uses sensors that may have lower accuracy and require calibration, making it unsuitable for precision-critical applications without additional validation efforts.
Frequently Asked Questions
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