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Censor that used in this system is MQ-2 gas censor. This Censor is used to detect LPG gas, i-butana, propana, metana,
alkohol, hidrogen, dan smoke, In this system, we use itu to detect LPG gas.
Figure 2
2.1.3 Buzzer
It is a device that can convert electric current into sound vibration. In this system it has a function as an alarm or a sign.
Figure 3
2.1.4 Relay
Has function is as an automatic switch to deliver electrical current.
Figure 4
481 | V O L 1 1 - I R S T C 2 0 1 7 & R E S P E X 2 0 1 7
