06-09-2017, 10:09 AM
LPG gas is supplied in pressurized steel cylinders. As this gas is heavier than air, when it escapes a cylinder that flows along the ground and tends to settle in low places, such as a basement. This can cause fire or suffocation if left untreated. Here is a circuit that detects the leakage of LPG gas and alerts the user through audio-visual signals.
This LPG gas sensor (MQ6), ideal sensor to detect the presence of a dangerous liquefied petroleum gas (LPG) and has high sensitivity to propane, butane, isobutene, natural gas. The sensor can also be used to detect combustible gases, especially methane. This circuit can detect leaks in your home, car or at a service station, the storage tank environment. This unit can be easily implemented at the industrial level by improving its ranges.
Block diagram
The load sensor detects the weight of the gas cylinder and gives the result in kilograms. This is interconnected using the USART (serial communication interface) of the microcontroller PIC16F877A. From the current total weight of the gas bottle in kilograms, we are calculating the percentage of LPG gas remaining in the cylinder and displaying it connected to the microcontroller. For the calculation of the percentage, we know the weight of the empty cylinder printed on the gas cylinder itself and also the total weight is printed on it. From these two values, we can calculate the amount of gas remaining by subtracting the weight of the empty cylinder from the total weight. This can be converted to a percentage and displayed on the LCD. At the same time, an LPG sensor module is used to detect any gas leakage and is interconnected with the microcontroller using the digital port pin and if a gas leak is detected, the output signal of the LPG sensor module changes and is detected by the microcontroller to display on the LCD, as well as give an audio alert using the buzzer connected to the microcontroller. If there is a gas leak, then the household AC power source can be disconnected using a relay. If no gas leakage is detected, the AC power supply is not disconnected. Programming for the microcontroller is done using built-in c using the MPLABX IDE and XC8 compiler. The circuit can be powered using a power supply consisting of an LM7805 IC regulator that provides a regulated 5v DC output. The entrance to the regulator
is a 9v DC adapter.
This LPG gas sensor (MQ6), ideal sensor to detect the presence of a dangerous liquefied petroleum gas (LPG) and has high sensitivity to propane, butane, isobutene, natural gas. The sensor can also be used to detect combustible gases, especially methane. This circuit can detect leaks in your home, car or at a service station, the storage tank environment. This unit can be easily implemented at the industrial level by improving its ranges.
Block diagram
The load sensor detects the weight of the gas cylinder and gives the result in kilograms. This is interconnected using the USART (serial communication interface) of the microcontroller PIC16F877A. From the current total weight of the gas bottle in kilograms, we are calculating the percentage of LPG gas remaining in the cylinder and displaying it connected to the microcontroller. For the calculation of the percentage, we know the weight of the empty cylinder printed on the gas cylinder itself and also the total weight is printed on it. From these two values, we can calculate the amount of gas remaining by subtracting the weight of the empty cylinder from the total weight. This can be converted to a percentage and displayed on the LCD. At the same time, an LPG sensor module is used to detect any gas leakage and is interconnected with the microcontroller using the digital port pin and if a gas leak is detected, the output signal of the LPG sensor module changes and is detected by the microcontroller to display on the LCD, as well as give an audio alert using the buzzer connected to the microcontroller. If there is a gas leak, then the household AC power source can be disconnected using a relay. If no gas leakage is detected, the AC power supply is not disconnected. Programming for the microcontroller is done using built-in c using the MPLABX IDE and XC8 compiler. The circuit can be powered using a power supply consisting of an LM7805 IC regulator that provides a regulated 5v DC output. The entrance to the regulator
is a 9v DC adapter.