Diseño y construcción de nodos embebidos integrables a una red inalámbrica para la alerta, supervisión y desinfección por medio de ozono en ambientes cerrados.

Abstract

The objective of the current graduation work was to design and build embedded nodes that can be integrated into a wireless network for warning, supervision, and disinfection with ozone in closed environments. For its development, a bibliographic review of similar existing systems was made, the elements that compose it were selected based on a comparative study of its technical information; functionality, cost and ease of interaction were considered. It is an easy-to-use portable device made up of four nodes based on Wi-Fi technology. The Sensor Node (SN) collects the data emitted by the sensors, processes them with a NodeMCU development card and sends them using the ESP-NOW communication protocol to the other embedded nodes, in addition to this, it contains a real-time clock module to specify the respective times, the Generation Node (GN) is responsible for controlling the emission of ozone gas (O3), the Warning Node (WN) alerts with light signals the accessibility to the environment, for this, it considers that the ozone level is acceptable in order to preserve human health, and the Visualization Node (VN) that allows data to be displayed and stored through the Ubidots platform. From the tests carried out, it was verified that when comparing the MQ-131 sensor with standard equipment, it does not incorporate error, remaining less than 5%, and it was established that the effectiveness of the PIR HC-SR501 sensor is 96.66%, which determines its reliability. When applying the coefficient of variation, a value of less than 15% was obtained, demonstrating stability. Communication tests evidenced lossless data reception at 250m with no obstacles. It is concluded that the device is reliable to help improve air quality. It is recommended to continue with research, which incorporates air quality sensors and uses payment platforms.