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Azit  / JOJAPS – JOURNAL ONLINE JARINGAN COT POLIPD
            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
















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