<![CDATA[The security system plays an important role for the comfort of human life today. Moreover, in the development of the times which are increasing day by day. In the world of technology, many things are implemented in security systems to increase consumer confidence. One of the main factors of the security system is theft by breaking into the building door. This security problem can be overcome by utilizing existing technology, for example with a QR Code. The design of this device will be carried out using two paths, namely hardware design and software design. This is done so that the design of this automatic lock system can work in accordance with the design which includes a circuit block diagram and circuit realization with the working principles of each circuit that has been designed. From some of the results of testing QR Code-based automatic door locks using the GM66 sensor which can be seen from several tables of test results, it can be concluded that the tool can work properly.]]>
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