Okereke Eze Aru
Volume: 11 Issue: 04, 2023
Abstract:
Liquefied Petroleum Gas (LPG) is a major source of cooking energy in Nigeria today, especially in the city areas because of its clean energy compare to firewood and charcoals used in the rural areas. There is always a danger of gas leakage as a result of negligence or failure from the regulating valve of the gas cylinder which poses great danger to the inhabitants of those houses, due to highly flammable nature of cooking gas. Cases of gas related fire has been on the rise and this can be avoided by employing a technology. In this work, a gas leakage detector system is proposed. The system is designed using microcontroller 8051, MQ-6 sensor, resistors, transistors, transformer, buzzer etc. The use of microcontroller 8051 is to enable the design and construction of a high accurate and fast response detection system. The detection system uses MQ-6 module, which has a gas detection range of 300-10000ppm as the LPG sensor, 89S52 microcontroller as the control unit, a buzzer as an alarm and a number of LEDs to indicate the gas leakage status. The microcontroller senses the presence of a gas when the voltages signal from the MQ-6 sensor goes beyond a certain level and gives an audio alarm. The microcontroller is programmed using assembly language and all the peripherals connected to it through it pins. When the system is powered ON, the microcontroller light a green LED to show the absence of a gas leakage. LPG is released and the sensor voltage signal monitored through the microcontroller. If the sensor output voltage level is below 2.0V, the green LED is kept ON and when the voltage is more or equal to 2.0V, the microcontroller blinks a red LED and set off an alarm to show the presence of a gas. The sensor has a high resistance in a clean air. In the presence of LPG gas, the sensor conductivity increases and the characteristic of the sensor is at 2.0V output from the sensor, the gas concentration is 300ppm, thus the trigger level is 2.0V.