ACROPOLIS CO₂ Sensor Network

This repository contains the software and hardware blueprints for the measurement systems deployed at the edge of the ACROPOLIS (Autonomous and Calibrated Roof-top Observatory for MetroPOLItan Sensing) CO₂ sensor network. This initial network consists of twenty prototype systems evenly distributed across the city of Munich. The project is part of ICOS Cities, funded by the European Union's Horizon 2020 Research and Innovation Programme under grant agreement No. 101037319.

Key Features

• Non-Expert Setup: The software is designed for easy deployment, requiring minimal technical expertise for setup and operation.
• Scalability: The network infrastructure allows for seamless scaling, enabling easy expansion to a larger number of devices and locations.
• Remote Software and Configuration Update: Supports remote updates for software and configuration, ensuring continuous improvement and easy deployment of changes.
• Dockerized Edge Software: The edge software runs within a Docker container for isolated and consistent deployment.
• Edge Agent: A standalone process managing the Dockerized edge software, controlling the active container version and acting as the endpoint for remote commands. It implements a MQTT client to act as a communication gateway.
• ThingsBoard Integration: All measurements are transmitted via MQTT to a hosted ThingsBoard instance for centralized data collection and analysis.
• Offline Data Backup: SQLite implementation serves as a local backup for measurement data.

Repository Overview

• Software
• Hardware
• Setup

System Overview

Each edge system is managed by a Raspberry Pi 4, utilizing an LTE hat (NB-IoT) for internet connectivity. The primary sensor is the Vaisala GMP343 CO₂ sensor, accompanied by auxiliary BME280 and SHT45 sensors for environmental monitoring. Airflow is regulated by a brushless membrane pump and 2/2 valves, which switch between the sampling head and calibration tanks. Additionally, a Vaisala WXT-532 wind sensor is co-located with the sampling head to monitor wind conditions. The system includes a UPS and battery backup to ensure uninterrupted operation.

Software Architecture

First Draft