The main aim of any security organization is to provide a comprehensive security net to its client. However, in the process the cost of the whole process in terms of labor and money needs to be considered. Many times the work force gets limited due to reasons such as unavailability of suitable people or economic considerations. In such cases, it becomes worthwhile to consider alternatives to workers in the form of unmanned security systems. Our project addresses this situation. An added advantage of security systems involving machines is that they are unaffected by factors psychological or physical factors such as fatigue, depression etc., all factors that affect the efficacy of workers in a security establishment. The objective of our project is to design an electro-mechanical device with automatic target detection and firing mechanism and a provision for remotely controlling the device too.
[...] The amplifier is followed by a network of capacitors and inductors used for impedance matching with the antenna. The signal is then transmitted through the antenna FM RECEIVER Figure 6.5 The FM receiver's function is to receive and demodulate the frequency modulated signal that was transmitted from the wireless transmission module. The antenna catches the signal, and passes it to the demodulator stage. This is actually a mixer. The 470uF capacitor and the 3mH inductor act as oscillator circuit which generate a signal of the same frequency as that of the carrier in the FM transmitter. [...]
[...] There are special and military devices available that operate at voltages as high as 18 volts The 555 Astable Circuit In an astable circuit, the output continually switches between the high and low states without any intervention from the user, producing a 'square' wave. An astable has no stable state - hence the name "astable". This type of circuit could be used to give a mechanism intermittent motion by switching a motor on and off at regular intervals. It can also be used to flash lamps and LEDs, and is useful as a 'clock' pulse for other digital ICs and circuits. [...]
[...] Address Notes: 3BCh - 3BFh Used for Parallel Ports which were incorporated on to Video Cards Doesn't support ECP addresses 378h - 37Fh Usual Address For LPT 1 278h - 27Fh Usual Address For LPT 2 Table 2 Port Addresses When the computer is first turned on, BIOS (Basic Input/Output System) will determine the number of ports you have and assign device labels LPT1, LPT2 & LPT3 to them. The BIOS first looks at address 3BCh. If a Parallel Port is found here, it is assigned as LPT1, and then it searches at location 378h. [...]
[...] To achieve electrical isolation, a light-emitting diode (LED) is used with a photo transistor Relay Explanation: The relay that we are using in this project is an 230V/ 2Amp relay and its an electro mechanical relay. The excitation voltage that is required is +12V DC. It is driven using the Relay driver IC ULN2003 / ULN2003A. The device is connected to the electro mechanical relay. When the relay is excited by applying the 12V dc the relay gets activated and in the process turns ON the device and when the excitation voltage is stopped the relay gets deactivated and in the process Turns OFF the devices Advantages of relays: Relays can switch AC and DC, transistors can only switch DC. [...]
[...] The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful microcomputer which provides a highly- flexible and cost-effective solution to many embedded control applications. The AT89C2051 provides the following standard features: 2K bytes of Flash bytes of RAM I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. [...]
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