Implementación de redes de sensores inalámbricas, en un sistema telemétrico para detectar y controlar fugas de gas GLP y monóxido de carbono en usos domésticos.

Abstract

In the present work, a Wireless sensor network was implemented in a telemetric system to detect and control liquefied petroleum gas (LPG) and carbon monoxide (CO) leaks in domestic uses. The Rational Unified Process (RUP) was used as methodology for the analysis, design, implementation and documentation of the project. The system evaluates the density of these gases in the environment remotely and controls their presence if the established exposure limits are exceeded. It comprises a network with three sensor nodes, one of which has the actuator function, which are integrated by an MQ 6 gas sensor and MQ 7 carbon monoxide sensor. It has a coordinating node that is responsible for receiving, displaying on a liquid crystal display (LCD), storing on a memory card and labeling the information supplied by the other nodes according to their identifier, which are communicated wirelessly with XBee S2 modules at distances of 40 square meters indoors, and linked to Arduino UNO modules from the transmission and processing block of the network. The coordinating node has the ability to generate alert and transmission messages over the cellular network when evaluating non allowed range of gases. From the test it was obtained that the system is able to measure, process and communicate in times less than 5 seconds with an average transfer rate between 2.09 Kbps and 2.38 Kbps from node to node and a percentage in the transmission and reception of data between 68.29 % to 89.29 %. It is recommended to use the data packet functionality (GPRS) of the coordinator node to store them on the web as historical information for possible investigations.