IoT Environmental Monitoring System
We designed and built a complete IoT sensor system for multi-parameter environmental monitoring — measuring temperature, humidity, dust, and air quality on a custom PCB centered around the STM32F4 microcontroller. Sensor data is transmitted in real time to a cloud backend, making continuous environmental oversight accessible for industrial sites, research facilities, and smart-building deployments.
Category:
IoTIndustry:
Industrial IoTYear:
2023The Challenge
Industrial and research environments need reliable, continuous environmental data — but off-the-shelf sensors lack the integration, analog conditioning, and connectivity required for accurate, cloud-connected monitoring. Custom hardware was necessary to combine multiple sensor types, handle analog signal conditioning, and deliver data reliably over wireless links to a central cloud platform.
Our Solution
We developed a custom PCB integrating an STM32F4 microcontroller with a multi-channel analog front-end, supporting I²C and SPI sensor buses. The firmware handles sensor polling, data fusion, and real-time wireless transmission via MQTT to a cloud backend. The hardware design prioritized signal integrity for the analog front-end and low-power operation for extended deployment without maintenance. The cloud side provides historical logging, threshold alerting, and a dashboard for trend analysis.
Key Features
- Multi-Parameter Sensing: Simultaneous measurement of temperature, humidity, dust (particulate matter), and air quality parameters on a single device.
- Custom PCB with Analog Front-End: Purpose-designed hardware with STM32F4 MCU, sensor interfaces, and analog conditioning stages ensuring measurement accuracy and noise immunity.
- Real-Time Cloud Connectivity: MQTT-based wireless data transmission to a cloud backend, enabling remote access, historical charting, and threshold-based alerting.
- I²C / SPI Multi-Sensor Bus: Flexible sensor bus architecture accommodating a variety of environmental sensor modules without hardware redesign.
- Low-Power Operation: Optimized firmware duty cycles and power management for long-term unattended deployment in industrial or field environments.
Technologies
- STM32F4
- C/C++
- Custom PCB
- Analog Front-End
- I²C
- SPI
- MQTT
- Cloud Backend
- Dust Sensor
Results
The system delivers continuous, multi-parameter environmental data with industrial reliability — enabling proactive monitoring, automated alerts, and data-driven decision-making for clients in manufacturing, research, and building automation.
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