Development of this web application was based on System Development Life Cycle (SDLC) methodology which is a Waterfall method. Websites was develop by using Hyper Text Markup Language (HTML) which play a part to integrate this website with the Structured Query Language database. Figure 2 shows each phase in the Waterfall Model which is Systems Planning, Systems Analysis, Systems Design, Systems Implementation and Systems Operation, Support and Security. The relationship of each phase to the others can be roughly described as a waterfall, where the output from a specific stage serves as the initial input for the following stage. During each phase, additional information is gathered or developed, combined with the System Implementation of the virtual laboratory applications is developed using Java and Structured Query Language. The interface is designed with HyperText Markup Language as the programming language with enclosed animation and also attractive graphic display. The target is to provide facility to student to study and understand digital logic design basic concept through virtual experiments without going to the lab and with the convenience of learning at their own pace. In the application development, the hardware and software requirements of the DigiLab are determined. Both are very important to determine application development suitability so that the application can be developed perfectly to achieve the objective which has been prescribed. Figure 5: DigiLab User Interface User and application can interact via the interfaces. From the interfaces, the system will perform what is desired by the user. It connects the system with the database, server and the application. Interface designs are important to determine system usability. Developing user friendly interfaces will make the application easier for user to use. This application is divided by two into sub-modules i.e. users and super users. Figure 4 illustrates the interaction between user and_ the application. Figure 4: Interactions between Application’s Function and Users Figure 7: Main Module Module Lab contains several of question and tasks for logic design labs. The screen will be appeared as shown by Figure 7 and Figure 8. Figure 6: Module User Guide for DigiLab For experiment on this virtual circuit, student must connect each logic gate arranged based on the requirement or specification. The circuit components will be prepared on the tool where the students only need to drag and drop all the stated components on the circuit. Result of work from the circuits’ extension will be broadcast through display bit 0 and 1 on the truth table. For display theory and experiment that need carried out, button theory and question will be prepared and will display on the toolbar. In order to display theory and question, new window will be appeared. Figure 5 shows he main interface of the application and Figure 6 shows he module user guide of DigiLab. Figure 8: Interface of Lab 1
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