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LPG Gas Leakage Detector using (MQ-9) Gas Sensor and pic18f2550 Microcontroller . MQ-9 Gas Sensor is one kind of semiconductor which has very lower conductivity in open air . But in Carbon Monoxide , Methane and LPG gas it's conductivity increases and by using ADC of pic microcontroller we can measure it . Let's take a look on MQ-9 sensor . Apr 02, 2018 · Micocontroller detects if the LPG level crossess threshold Level. Buzzer is turned on in case of LPG gas leakage detection. At the same time, a relay is turned on. LCD display shows the value of ... In the mini project category, we have added fire detection alarm system using 8051 microcontroller. In this project, we have used 89S51 microcontroller and a smoke sensor. For smoke detection, we have used an MQ9 gas sensor which detects carbon monoxide and even LPG, and methane. This sensor is very useful for detection of gas leakage. The presence of dangerous LPG leakage in the cars, service station or in the storage tank environment can be detected using the Ideal Gas Sensor. This LPG gas leakage detector unit can be easily integrated into a unit that can sound an alarm or give a visual suggestion of the LPG concentration. The ... Gas sensor is used to detect the Gas, which is connected to 8051 micro controller through ADC0804. LCD is used to Display the Gas level and Relay status. GSM is used to send the message when it detects the Gas in room or home. Buzzer also make sound when controller detects any Gas.