This gas can harm human's life by inhaling it for a few minutes because it can make us feel dizzy and fainted. In 6 December 2018, The explosion of a fast-food restaurant in the City ONE Megamall mall was believed to be caused by a butane-type liquid petroleum gas (LPG) leak. The incident resulted in 3 workers being killed as a result of collapsing walls and ceilings and injuring 41 other victims, including civilians visiting the mall. Retrieve from, Joni.M. (2018,December).Kebocoran gas dipercayai punca letupan https://www.bharian.com.my/berita/kes/2018/12/506078/kebo coran-gas-butanedipercayai-punca-letupan. In this cases, gas leak detector becomes necessary because it can help people from the danger of any gas leaks. There are several research papers have been published on gas leak detection techniques. We have studied a research articles about gas detector based on IoT from Sahu, L. K. (2017). Internet of Things (IOT) Based Gas Leakage Monitoring and Alerting System with MQ2Sensor. https://www.ijedr.org/papers/IJEDR1702333.pdf.. This document presents the detection using alarm and consists a Wi-Fi module that will inform the user by sending an SMS message to their phone. The LPG leak detection with reporting system has been introduced and can be used with alternating current. In this products, LCD and air valve is used and Arduino Uno as a microcontroller and provide a power of + 5V. MQ-2 gas is used to detect LPG. In this project, butane and methane were used because it is affordable and it is easy to obtain compared to the others. Thus, this two gases are mainly used either in factory restaurants and home.