Device description
Overview
The CICERONE AirLink firmware is an embedded system designed for continuous indoor air quality monitoring with remote telemonitoring capabilities. Built on the Arduino framework for the Nano 33 BLE Sense Rev2, the firmware implements a non-blocking, timer-based architecture that ensures reliable data collection and transmission.
Key Features
- Multi-Sensor Integration: Seamlessly interfaces with SEN54 (particulate matter & VOC) and T6793-5K (CO₂) sensors
- Periodic Data Acquisition: Sensor readings every 5 seconds with 10-minute averaging cycles (144 data points per day)
- NB-IoT Connectivity: Optional wireless data transmission via SIM7020G module
- Real-Time Clock: Accurate timestamping using DS3231M RTC with battery backup
- Modular Design: Clean separation of concerns with dedicated APIs for each component
- Debug System: Multi-level logging framework for development and troubleshooting
- Low Power: Optimized for battery-powered deployment scenarios
- Production Ready: Conditional compilation eliminates unused code for minimal footprint
Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| Platform | Arduino Mbed OS Nano | Nano 33 BLE Sense Rev2 |
| Language | C/C++ | Arduino framework |
| Compiler | GCC ARM | Via Arduino CLI |
| Flash Memory | ~100-150 KB | Depends on enabled modules |
| RAM Usage | ~20-30 KB | Dynamic allocation minimal |
| Sampling Rate | 5 seconds | Configurable in code |
| Averaging Period | 10 minutes | 120 samples per average |
| Transmission Interval | 10 minutes | 144 transmissions/day |