11-07-2012, 10:47 AM
plz post ppt of wireless intimation system using rf
plz send ppt of this topic to my email id
metlap4[at]gmail.com
11-07-2012, 10:47 AM
plz post ppt of wireless intimation system using rf plz send ppt of this topic to my email id metlap4[at]gmail.com
16-08-2012, 02:20 PM
WIRELESS ACCIDENT INTIMATING SYSTEM USING RF 1WIRELESS ACCIDENT.pdf (Size: 1.77 MB / Downloads: 62) The main aim of this project is to implement a system to identify accident by using wireless communication technology RF. The purpose of the project is to get information about the crashing of particular vehicle which passing through a remote area, and using sensor and transmitting a message to the concerned receiver section by using RF communication. In present days Electronic communication takes an important role. In this project we are sending information about vehicle accident by using RF communication with the help of Microcontroller. In our project we have two sections; at first section means the vehicle side, we are going to use the RF Transmitter to transmit the accident information. Accident of a vehicle is identified by using a sensor informs of a vehicle. Whenever the accident will happen the information will be sent to the receiver section .In this section we are using a H-bridge circuit to drive the motor. And second section is the receiver section; this is the section where we will get the information about accident of a vehicle. Here the accident information displayed on lcd and a buzzer at this section will give a sound whenever accident occurs. In these two sections we using microcontroller which process the data and it will send to the other section by RF communication MICRO CONTROLLER 89C51 INTRODUCTION A Micro controller consists of a powerful CPU tightly coupled with memory, various I/O interfaces such as serial port, parallel port timer or counter, interrupt controller, data acquisition interfaces-Analog to Digital converter, Digital to Analog converter, integrated on to a single silicon chip. If a system is developed with a microprocessor, the designer has to go for external memory such as RAM, ROM, EPROM and peripherals. But controller is provided all these facilities on a single chip. Development of a Micro controller reduces PCB size and cost of design. One of the major differences between a Microprocessor and a Micro controller is that a controller often deals with bits not bytes as in the real world application. Intel has introduced a family of Micro controllers called the MCS-51. Code memory Code memory is the memory that holds the actual 89C51 programs that is to be run. This memory is limited to 64K. Code memory may be found on-chip or off-chip. It is possible to have 4K of code memory on-chip and 60K off chip memory simultaneously. If only off-chip memory is available then there can be 64K of off chip ROM. This is controlled by pin provided as EA. Internal RAM The 89C51 have a bank of 128 of internal RAM. The internal RAM is found on-chip. So it is the fastest Ram available. And also it is most flexible in terms of reading and writing. Internal Ram is volatile, so when 89C51 is reset, this memory is cleared. 128 bytes of internal memory are subdivided. The first 32 bytes are divided into 4 register banks. Each bank contains 8 registers. Internal RAM also contains 128 bits, which are addressed from 20h to 2Fh. These bits are bit addressed i.e. each individual bit of a byte can be addressed by the user. They are numbered 00h to 7Fh. The user may make use of these variables with commands such as SETB and CLR. Flash memory is a nonvolatile memory using NOR technology, which allows the user to electrically program and erase information. Flash memory is used in digital cellular phones, digital cameras, LAN switches, PC Cards for notebook computers, digital set-up boxes, embedded controllers, and other devices. TIMERS On-chip timing/counting facility has proved the capabilities of the micro controller for implementing the real time application. These includes pulse counting, frequency measurement, pulse width measurement, baud rate generation, etc,. Having sufficient number of timer/counters may be a need in a certain design application. The 8051 has two timers/counters. They can be used either as timers to generate a time delay or as counters to count events happening outside the micro controller. Serial Communication: Serial data communication uses two methods, asynchronous and synchronous. The synchronous method transfers a block of data at a time, while the asynchronous method transfers a single byte at a time. In data transmission if the data can be transmitted and received, it is a duplex transmission. This is in contrast to simplex transmissions such as with printers, in which the computer only sends data. Duplex transmissions can be half or full duplex, depending on whether or not the data transfer can be simultaneous. If data is transmitted one way at a time, it is referred to as half duplex. If the data can go both ways at the same time, it is full duplex. Of course, full duplex requires two wire conductors for the data lines, one for transmission and one for reception, in order to transfer and receive data simultaneously. |
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