Desenvolvimento de um sistema de segurança contra vazamento de gás numa residência usando sensores e alerta via sms

Abstract

In the present work, a security system against gas in a residence was developed using sensors and alerts via SMS. In the prototype built, a low cost and easy access policy was used when purchasing some essential components such as: Arduino Uno, MQ 2 Sensor, Protoboard, 2 Channel Relay and GSM Module. This work is based on qualitative research, where tests were carried out for 90 minutes using a lighter to simulate the source of gas leakage close to the MQ–2 sensor, in other to detect the gas leakage. After that the system response time was in three (3) different environments, namely: closed environment, partially closed environment and outdoor. The system performed the proposed functions by detecting gas in the environment, when the gas leakage level was between 30% – 50%, the ventilation system was activated through the cooler as a way of evacuating the gas in the location and the electrical network worked normally. When the gas leakage level was above 50%, the cooler and the electrical network were automatically turned off, the green, blue and red LEDs remained on and the system sent a text message to the numbers registered in the program with the following content: "Danger, Evacuate the location". A simulation was carried out with the aim of testing the capacity of the system, taken outdoors and subjected to gas from the lighter, however, due to air currents, the gas level did not exceed the safety limit, thus no dangerous situation occurred due to the leakage.