LPG gas leaks cause serious problems in its use, it is very vulnerable to leaks that cause LPG gas cylinders to explode and catch fire, therefore an automatic gas leak detection and monitoring system was developed. If a gas leak occurs, the sensor will immediately recognise the incident and send a notification in the form of an alarm sound and a warning notification sent to the Smartphone. This detection system is made to determine gas leaks in gas cylinder regulators using the Relatime Database method on the RTOS (Real Time Operating System) system with Fog-Cloud Computing services.

PT. Duta Nichirindo Pratama is a company engaged in the field of Autoparts Manufacture. Barcode is the identity of an item / product on the package. Barcode technology has been used as the identity of goods in a production. Barcodes are used to facilitate the identification of goods produced. Paste the barcode on the packaging of packaging results at PT. Duta Nichirindo Pratama is done manually, but there are often errors attached to the barcode on a similar packaging. This research will design and create a system based on Visual Basic.Net and Arduino to select barcode attachment errors that have the potential to be sent to consumers. The system is designed using Unified Modeling Language (UML) diagrams, database design and interface menu design. The system created will then be tested to detect the black box test. With a computing-based design system that functions to detect barcodes on the packaging automatically, the problem of sticking barcodes on the packaging can be detected.