| dc.description.abstract | There are many different types of gases and gas needs. One of geses that is widely used
in both domestic life and industry is LPG. This gas is a colorless liquid that has sting smells.
LPG is formed from amixture of hydrocarbon compounds i.e. butane and propane. The
characteristic of LPG is sensitive to fires, flammable, odorless and colorless. The LPG that is
marketed in public is a flammable fuel and sensitive to fire. It often causes a fire. Because of
this fact, it is necessary to have a device that can detect any gas leaks. The systemof the
device introduced in this research works by detecting the gas from the LPG itself. the HS133
sensor which is used in this device is working when there is gas leak in a room, the basic
principle is if the gas molecul touchs sensor, it will make the resistance decline according to
gas concentration and will affect the output voltage anvice versa. Sensor output will be
processed by signal conditioning and
the result will be converted to AD0804 circuit. The ADC output will be read by
microcontroller AT89S51 and the result is displayed to the PC. The alarm will sound if the
gas concentration exceeded threshold. | en_US |
