Air Quality Monitor
We built a dedicated IoT air quality monitoring device that combines laser-based particulate matter sensing (PM2.5 / PM10), multi-gas detection, and environmental sensors (temperature, humidity) into a single compact unit. Data is transmitted in real time via MQTT to a cloud dashboard, giving operators instant visibility into air quality conditions and long-term trend data for compliance and health management.
Category:
IoTIndustry:
Environmental IoTYear:
2024The Challenge
Accurate particulate matter and gas detection in real indoor and outdoor environments is difficult: sensor cross-sensitivity, temperature drift, and variable airflow all degrade measurement quality. At the same time, deployments require wireless connectivity, low-power operation, and a cloud layer that makes the data actionable, not just a raw number stream. Achieving all of this in a compact, affordable device demands careful hardware and firmware co-design.
Our Solution
We selected a laser particle counter (PMS5003-class sensor) for PM2.5/PM10 measurement, paired with electrochemical gas sensors for CO₂ and VOCs, and a combined temperature/humidity module. An STM32 microcontroller handles sensor polling, calibration compensation, and data packaging. Connectivity is provided via Wi-Fi or cellular, with MQTT delivering readings to a cloud backend that stores historical data, generates trend charts, and triggers configurable threshold alerts. The enclosure design ensures controlled airflow across all sensor inlets.
Key Features
- PM2.5 / PM10 Particulate Sensing: Laser particle counter delivers accurate fine and coarse dust concentration readings with ±10% precision, covering the most health-critical size fractions.
- CO₂ & VOC Gas Detection: Electrochemical and metal-oxide sensors detect carbon dioxide, volatile organic compounds, and other key air quality indicators for indoor environment management.
- Temperature & Humidity Measurement: Calibrated environmental sensors provide the ambient context needed to interpret particulate and gas readings correctly.
- Real-Time Cloud Dashboard: MQTT data stream feeds a cloud backend with live readings, historical charts, and configurable alerting for threshold exceedances.
- Compact, Deployment-Ready Form Factor: Optimized enclosure with controlled airflow inlets enables wall-mounted or freestanding installation indoors or in sheltered outdoor settings.
Technologies
- STM32
- PMS5003
- CO₂ Sensor
- VOC Sensor
- Custom PCB
- Wi-Fi / MQTT
- Cloud Backend
- C/C++
Results
The air quality monitor provides actionable, scientifically grounded environmental data for industrial facilities, office buildings, schools, and research deployments, turning raw sensor readings into insights that protect occupant health and satisfy regulatory requirements.
Work With Us
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From Edge AI inference to production firmware, we turn complex embedded challenges into real, deployable solutions. Let's talk.
