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RF ATTENDENCE

 

 

 

 

 

 

 

 

 

Introduction

 

In this  project we will  make one transmitter and RF receiver. From transmitter we will send the roll no . of student. On receiver side we will mark the attendance. RF remote control which is built using MT34EN and MT34DEC chips. The remote control is built using RF encoder chip MT34EN that will generate different codes. These codes will be transmitted by 434 MHz RF transmitter. At the receiving side these codes will be received by 434 MHz RF receiver and decoded by RF decoder chip MT34DEC. These codes are fed to 89C51 to take a controlling action on moon walker. We will use 16*2 LCD display.

For the regulated power supply we use ic 7805 as a regulator to provide a fix 5 volt power supply.

. Here we use pc 817 ( 4 pin opto coupler) to interface the micro controller with  the motor circuit.

In this project we will make a transmitter for RF data transmission. Pin no 1of RF tx module is ground . second is for data , third for VCC and fourth for antenna Transmitter

 

 

 

 

 

 

 

 

 

 

 

Block Diagram of Transmitter

 

 

 

 

OUR PROJECT IS BASED ON THE EMBEDDED SYSTEM

 

 

What is Embedded System?

 An embedded system is some combination of computer hardware and software, either fixed in capability or programmable, that is specifically designed for a particular function. Industrial machines, automobiles, medical equipment, cameras, household appliances, airplanes, vending machines and toys (as well as the more obvious cellular phone and PDA) are among the myriad possible hosts of an embedded system. Embedded systems that are programmable are provided with programming interfaces, and embedded systems programming is a specialized occupation.

Certain operating systems or language platforms are tailored for the embedded market, such as Embedded Java and Windows XP Embedded. However, some low-end consumer products use very inexpensive microprocessors and limited storage, with the application and operating system both part of a single program. The program is written permanently into the system's memory in this case, rather than being loaded into RAM (random access memory) like programs on a personal computer.

 

Microcontroller:-

A microcontroller (often abbreviated MCU) is a single computer chip that executes a user program, normally for the purpose of controlling some device hence the name microcontroller.

 A microcontroller is differed from microprocessor in many ways. Basically microprocessors are the devices which can process huge amount of data. A microprocessor cant do anything on it own. Even to light a led a microprocessor needs minimum of a ROM, RAM, Latch, Address decoders, PORT controllers. But for the same application if you take a microcontroller you barely need a crystal and some capacitors.

 So from this you can understand how versatile the microcontroller is.

 

 

 

 

Different microcontrollers in market

 

 

 

 

PIC

 PIC ("Programmable Intelligent Computer" or "Peripheral Interface Controller") microcontroller is popular among engineers and hobbyists alike. PIC microcontrollers come in a variety of "flavors", each with different components and capabilities.

Many types of electronic projects can be constructed easily with the PIC family of microprocessors, among them clocks, very simple video games, robots, servo controllers, and many more. The PIC is a very general purpose microcontroller that can come with many different options, for very reasonable prices.

 

Intel 8051

Intel 8051 is CISC architecture which is easy to program in assembly language and also has a good support for High level languages.

This microcontroller is one of the easiest microcontrollers to learn.

The 8051 microcontroller is in the field for more than 20 years. There are lots of books and study materials are readily available for 8051.

 

 

 

 

 

 

ATMEL 89S52

Features

 

 

 

 

Description

 

The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmels high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pin out. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammar. By combining a versatile 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.

 

 

 

 

 

 

 

 

 

 

COMPONENT LIST

 

 

component

qty

rate

IC89C051,

 

1

60

ULN2003, 

 

1

30

Diodes in4001,

 

4

1

IC 7805

1

15

Optocoupler PC817

 

4

12

Tr548

4

3

Tr 558

4

3

Motors 12v

2

250

IC base 20 pin

1

10

Crystal 12 Mhz

1

25

Resiatncec 10k

4

.25

4k

4

.25

Cap 10f

1

5

Connecting wires

1

20

Ir sensors

3

120

 

 

 

 

 

HARDWARE REQUIRED

 

    8051 programmer universal kit

    CRO 20 Mhz

    Digital multimeter

 

 

SOFTWARE REQUIRED

 

 

    Keil for Programming

    OrCAD for PCB designing

    Proteus 7.6 Simulation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bibliography:

 

 

www.atmel.com

www.freeideas.com

www.8051projects.com

http://www.multyremotes.com/remote-robo-vehicle.htm