Abstract. LPG gas is the main fuel used in households. These days LPG gas leak triggered an accident that resulted in huge losses, especially if the accident occurred within the dense housing. LPG gas leakage monitoring and early detection of a gas leak and a leak warning is needed to prevent more fatal accident. Wireless sensor networking is a technology that can be used to build a centralized monitoring system by using a microcontroller as the interface and control system. This research developed system device monitoring and early detection of gas leaks by utilizing gas sensors MQ-4 and AVR microcontroller family as control devices. The system is also equipped with XBee PRO S2B nirkable devices as the interface to the wireless networking system that is used to transmit sensor data from the detection point to the monitoring center equipped with a PC and software integrated Visual Basic. Gas leak alert is sent with the message formats through social networking Gtalk.
Digitally height and weight of human body measuring instrument based sound module arduino is a modern measuring instrument that serves to measure the height and weight of the human body and provides information on BMI (body mass index) and weight of the human body. This tool is designed using ultrasonic sensors SRF-04 as a measurement of height and Load Cell as a measurement of weight and has an LCD display and output of the sound module. This tool has a maximum height limit measure measuring 200 cm and maximum weight limit of 200 Kg. The working principle of this tool is arduino read wheter object is to use the tool if yes then the sensor will transmit data to the microcontroller and the data will be displayed through the LCD and will be read out via the sound module. The information to be read is the weight, height, BMI, BMI status, ideal weight. From the results of testing this tool has a fault or error in the measurement of the weight of 0,43%.
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