Multi-node Networked Indoor Air Quality Monitor

We present an open-source wireless indoor air quality monitoring system consisting of carbon dioxide (CO2), 2.5 mu m particulate matter (PM2.5), and airflow sensors. This system also contains wireless mesh networking capabilities, allowing many of these systems to be placed throughout a space to measure the indoor air quality of a wide area. The system is easily user-configurable to achieve 3 months, 6 months, or 1 year of battery life. The nodes wirelessly communicate with a host system, which stores the data locally in text-based log files and displays the data in plots organized by measurement. The system is designed to be open-source, utilizing predominantly off-the-shelf components and software. We expect this approach to allow for greater adaptability and ease of use for those wishing to design or use similar sensor systems.