01-04-2011, 02:35 PM
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1.1WIRELESS ELECTRONIC NOTICE BOARD USING R.F:-
Data Security is primary concern for every communication system. There are many ways to provide security data that is being communicated. However, what if the security is assured irrespective of the hackers are from the noise. This Project describes a design of effective security for data communication by designing standard algorithm for encryption and decryption. R.F. is a PAN technology based on the IEEE 802.15.4 standard. Unlike Bluetooth or wireless USB devices, R.F. devices have the ability to form a mesh network between nodes. Meshing is a type of daisy chaining from one device to another. This technique allows the short range of an individual node to be expanded and multiplied, covering a much larger area. The source information is generated by a key pad and this will be encrypted and is sent to destination through R.F. modules. The receiving system will check the data and decrypt according to a specific algorithm and displays on the LCD.This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.
2. LITERATURE SURVEY
2.1 WIRELESS HISTORY:-
The wireless era was started by two European scientists, James Clerk Maxwell and Heinrich Rudolf Hertz. In 1984, Maxwell presented the Maxwell’s equations by combining the works of Lorentz, Faraday, Ampere and Gauss. He predicted the propagation of electromagnet waves in free space at the speed of light. His theory was accepted 20 years later, after Hertz validated electromagnetic wave (wireless) propagation. Hertz demonstrated RF generation, propagation and reception in the laboratory. His work then continues by Guglielmo Marconi after 2 decades. He then acquires a method for transmitting and receiving information. Marconi started to commercialize the use of electromagnet wave propagation for wireless telegraphs and allowed the transfer of information from one continent to another without physical connection. Since the cellular mobile phone system was introduced in the early 1980’s, the wireless industry has gone several generations of revolutionary changes. Other examples for this application are in remote sensing, broadcast, smart automobile and highways and so on.
2.2 NOTICE BOARD HISTORY:-
We are instrumental in providing a wide variety of display notice boards that can be used to display anything, be it some painting, any article, a notice or any other information. Offered at competitive prices, these are available in various sizes and shapes and are extremely durable.
2.2.1 DIFFERENT TYPES OF NOTICE BOARDS
STANDARD NOTICE BOARD:-
The manufactures standard notice boards in Beige / Blue / Green / Gray / Maroon & Red colours. These boards stand apart from others available in the market, owing to their superior quality and cost benefit. It caters to schools, colleges, institutions, offices, government agencies and other bulk buyers.
PIN UP DISPLAY BOARD:-
This non magnetic Enamel led White Boards are useful for writing with marker pen and can be wiped off with dusters. The places from where high demands come for these products are computer institutions, conference halls and from other displaying organizations. These boards are completely dust free and have high resistance capacity against stains, wears, high temperature and common household chemicals.
CORK NOTICE BOARDS:-
To display the papers with the assistance of push pins, cork notice boards are considered as very useful. These boards are available only in natural cork color and not in any other colors. The natural look of these boards is very attractive and more important thigh is that these can be washed. These boards are extensively used in the corporate sector.
DANGER NOTICE BOARD:-
Danger Notice Board / Plate in Hindi or English and in addition in the local language with the sign of skull and cross bones are required to be provided on the power line supports. The “Danger" Notice Plates are not required to be provided on supports like PCC, wood, steel rails etc. which cannot be climbed easily with the aid of ladder or special appliance. We are maintaining the Indian Standard specification i.e. IS: 2551-1982.
SCHOOL BOARDS:-
A wide range of School Boards which are available in green and black color. The range is widely used in training rooms, schools, institutions and conference rooms. These ensure smooth writing and are known for its clean surface with glare reduction. It is light weight and durable.
FLIP CHART BOARDS:-
A Flip chart Boards can be clipped on to any board to assist in displaying charts and clipping important information. It can hold a flip chart pad or many sheets which can be turned over during a presentation.
LOBBY BOARDS:-
Lobby Boards for hotels and reception. These lobby boards are designed using brass stand and stainless steel. Different types of Lobby Boards such as Gold Sign Boards and Velvet Pining Boards
NOTICE BOARD WITH DOOR:-
Notice board covered with imported quality transparent acrylic Door framed in anodized aluminum channels with support of hinges, lock and key arrangement. Very useful where protection of displayed material matter.
FABRIC PIN UP NOTICE BOARD:-
Fabric pin up notice board which is renowned for its effectual functioning among pour valued clients. It has the good quality of fabric which enhances the décor of office and push pins is used. Our board can be availed in following colors: Grey, Beige, Blue, Brown.
