RE: security system projects
Security System.doc (Size: 4.52 MB / Downloads: 86)
Security has always been one of the most important concerns of the electronics industry. Everyone will have different security needs and different logistical factors, to deal with when designing an integrated electronic security system. Different sensors are designed for different applications so it pays to consider the potential entry and exit points of an intruder, as well as which rooms are likely to be targeted and the best position for control panels. A security system can be a cabled system or a wireless system.
Wireless systems versus cabled systems
Wireless and cabled systems both have advantages and disadvantages, and the choice will be largely determined by the nature of dwelling. Wireless systems are particularly useful for retrofitting, as installing cabling in multi-storied buildings and double brick houses is quite impractical. If a house is heritage listed, a wireless system may be the only option.
However, concrete walls can block wireless signals and in areas with a lot of radio frequency (RF) signals (for instance, where there are high tension power cables) a wireless system may not work at all.
This is a cabled system which scans its surroundings continuously through different sensors, processes the data obtained from them in a microcontroller and informs the user through telephone as well as panics the intruder in case of any unsecured situation. This project designed provides an optimum security solution at low cost with low power consumption added with an ease in maintenance.
In this project, the program is written in microcontroller internal 8KB flash for reading the data from sensors, analyzing the situation and to dial and deliver the pre- recorded voice message, simultaneously turning the buzzer ON in case of any unsecure situation. In programming mode it reads the data from user via matrix keyboard. Subsequently stores the information in EEPROM. It displays the dialed numbers, door opening - closing timings, and the sensor status in the display attached to it.
The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memory. The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 and 80C52 instruction set and pin out.
The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.
The project can be used to provide an optimum security to the shops, houses, banks, etc wherever it is used, at a low cost with easy maintenance (user-friendly) consuming very less power. There will be no effect of power failures or intentional power cuts as the device can also operate with the 12V rechargeable battery incorporated in it. By using different types of sensors the security level can be increased greatly. Anyway proper care should be taken while mounting the sensors to avoid false detections (due to pets, excess light on PIRs, etc.).