IoT sensory platform for monitoring temperature, relative humidity of the air and CO2 in situ

This article addresses the development of a sensory platform capable of measuring temperature, relative humidity, and carbon dioxide. The system is based on concepts of an IoT (Internet of Things) platform using the ESP8266 microcontroller connected to DHT21 and CSS811 sensors, the power system has lithium batteries. An App (Application) in Blynk technology was used to display the collected information and georeferenced the data, which in turn are stored in a digital cloud. Two experiments were carried out to determine the environmental quality in a forest and urban area within Belém, showing the quality of the developed system and the influence that trees have on air quality in relation to carbon dioxide and thermal comfort. Furthermore, a reformulation of the urban public transportation system must be employed, enabling it to be used in an efficient and less polluting way, since transportation is the leading emitter of pollutants that contribute to the greenhouse effect and aggravates factors related to public health. The description of the developed device allows its reproducibility and has as main differentials: optimized power system, possibility of integration with renewable energies, low cost platform; connection with several sensors; easy programming and operation; internet access and, last but not least, low cost.