VentQsys: Low-cost open IoT system for [Formula: see text] monitoring in classrooms

In educational context, a source of nuisance for students is carbon dioxide ([Formula: see text] ) concentration due to closed rooms and lack of ventilation or circulatory air. Also, in the pandemic context, ventilation in indoor environments has been proven as a good tool to control the COVID-19 infections. In this work, it is presented a low cost IoT-based open-hardware and open-software monitoring system to control ventilation, by measuring carbon dioxide ([Formula: see text] ), temperature and relative humidity. This system provides also support for automatic updating, auto-self calibration and adds some Cloud and Edge offloading of computational features for mapping functionalities. From the tests carried out, it is observed a good performance in terms of functionality, battery durability, compared to other measuring devices, more expensive than our proposal. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11276-021-02799-5.