14-04-2011, 02:23 PM
PRESENTED BY:BY
J.SRIKANTH REDDY
G.ANVESH REDDY
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ABSTRACT
An embedded system is a special-purpose computer system designed to perform a dedicated function. Embedded system is fast growing technology in various fields like industrial automation, home appliances, automobiles, aeronautics etc. Now more than ever, embedded systems designers are recognizing the value of wireless. From home light switches and entertainment systems to industrial controls to remote monitoring and communications, wireless is permeating an increasing variety of applications that might once have been thought of as either standalone or otherwise happily tethered to a wire of some sort.
The main aim of this project is to prevent the collision among air flights. Many methods have to be followed to prevent the collision between the flights, but here RF technology is used. The microcontroller provides some additional features for future enhancement. This project consists of two major units 1) Transmitter Unit and 2) Receiver Unit.
The RF transmitter consists of an encoder which takes parallel data from micro controller and transmits serial data. And receiver system containing the decoder converts the serial data into parallel data and fetches it to the micro controller unit. Then the data can be processed by the controller presented in the Receiver unit, and drives the motors in the opposite direction. All the status about transmitter end is displayed in LCD. The controller also initiates the Buzzer. This unit is placed in the Flight
INTRODUCTION
The main aim of this project is to prevent the collision among air flights. Many methods have to be followed to prevent the collision between the flights, but here RF technology is used. The microcontroller provides some additional features for future enhancement. This project consists of two major units 1) Transmitter Unit and 2) Receiver Unit.
The RF transmitter consists of an encoder which takes parallel data from micro controller and transmits serial data. And receiver system containing the decoder converts the serial data into parallel data and fetches it to the micro controller unit. Then the data can be processed by the controller presented in the Receiver unit, and drives the motors in the opposite direction. All the status about transmitter end is displayed in LCD. The controller also initiates the Buzzer. This unit is placed in the Flight.
The system requirements and control specifications clearly rule out the use of 16, 32 or 64 bit micro controllers or microprocessors. Systems using these may be earlier to implement due to large number of internal features. They are also faster and more reliable but, the above application is satisfactorily served by 8-bit micro controller. Using an inexpensive 8-bit Microcontroller will doom the 32-bit product failure in any competitive market place.
Coming to the question of why to use AT89C52 of all the 8-bit microcontroller available in the market the main answer would be because it has 8 Kb on chip flash memory which is just sufficient for our application. The on-chip Flash ROM allows the program memory to be reprogrammed in system or by conventional non-volatile memory Programmer. Moreover ATMEL is the leader in flash technology in today’s market place and hence using AT 89C52 is the optimal solution.
In this project we are using 318 decoders. The decoders are a series of CMOS LSIs for remote control system applications. They are paired with the 318 series of encoders. For proper operation a pair of encoder/decoder pair with the same number of address and data format should be selected
The programmable address/ data is transmitted together with the header bits via an RF or an infrared transmission medium upon receipt of a trigger signal. The capability to select a TE trigger type or a DATA trigger type further enhances the application flexibility of the 318 series of encoders.
CHAPTER 2
Literature Survey
Embedded systems do a very specific task; they cannot be programmed to do different things. Embedded systems have very limited resources, particularly the memory. Generally, they do not have secondary storage devices such as the CDROM or the floppy disk. Embedded systems have to work against some deadlines. A specific job has to be completed within a specific time. In some embedded systems, called real-time systems, the deadlines are stringent. Missing a deadline may cause a catastrophe-loss of life or damage to property. Embedded systems are constrained for power. As many embedded systems operate through a battery, the power consumption has to be very low. Some embedded systems have to operate in extreme environmental conditions such as very high temperatures and humidity.
An embedded system is a special-purpose computer system designed to perform a dedicated function. Embedded system is fast growing technology in various fields like industrial automation, home appliances, automobiles, aeronautics etc. Now more than ever, embedded systems designers are recognizing the value of wireless. From home light switches and entertainment systems to industrial controls to remote monitoring and communications, wireless is permeating an increasing variety of applications that might once have been thought of as either standalone or otherwise happily tethered to a wire of some sort.
Why RF?
• Bluetooth range is very low ,but we want somewhat higher range
• AF communication is point to point, but we want to detect objects which are travelling all the sides of main object
• Satellite range is very high, it can detect objects at long distance also .so it is also of no use
But with RF we can rectify the above three problems
