One of the biggest demerits of the development in the field of technology is the innovative techniques and ideas that are being introducing for illusory purposes. These imperfections of on going technology should be prevented through the inventions to hinder such types of criminal or illegal activities. This project is one of such campaigns which are taking part to guard the areas that need a lot of security. The theme of this model is illustrated in Fig. 1. The figure shows the whole system comprises of two sections. First one is Hardware and the second one is Software (Computer).
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This is the output which is to be provided to computer through D0 pin of parallel port. Since the LPT works on Low and High voltage levels, therefore the square wave signal has to be converted into voltage levels using the conditional circuit shown in Fig. 4. Fig. 4. The circuit which converts square wave signal into voltage levels. Fig. 5. The front panel of Security System. Fig. 6. The Block Diagram of Security System. Whereas Indicators simulate instrument output devices and display data, which the block diagram generates according to the logic. The block diagram contains the graphical source code of VI.
The computer now assumes that a data is transmitting serially to the device (Bluetooth mobile) which is connected to the computer via Bluetooth device. Notice that in Fig. 7, grids are absent as compared to that of fig. 5. This will be the case either when the Virtual Instrument is running or when the block diagram of VI is password protected. When the infrared beam interrupts, a high voltage will appear at D0 pin (any pin of LPT can be exploit for this purpose except 18-25 as they are gnd pins) of parallel port, red light (Fig. 8) starts blinking and makes a call at a number that has been entered for being informed of current situation.
This call will be made using Bluetooth device. There is a simulation button showing at the bottom of front panel. This button can be used to simulate the project even when the hardware is not connected to the computer via parallel port. This is one of the magnificence of LabVIEW. C. Bluetooth Now mention the COM port (virtually assigned for mobile device) in the LabVIEW block diagram. It access to the particular COM port to which the mobile device is connected, when a specific condition (to make call) is being satisfied. Finally, call can easily be made by using AT or ATtention Commands. Fig. 9.
