Major Project

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MAJOR PROJECT SEMINAR

Audio & Video Capture ROBOT

using RF Communication

ON

Presented By: -Abhayanand Maurya (0814131002)

Imran khan (0814131021)Naveen Srivastava (0814131027)Vinod Kumar Soni (0814113050)

Project Guide: -

Mr. S.P. Verma

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INTRODUCTION

This robot is controlled by a RF remote. This can be moved forward and reverse direction using geared motors of 60RPM. Also this robot can take sharp turnings towards left and right directions. This project uses AT89S52 MCU as its controller. Simultaneously the images around the robot will be transmitted to remote place. User can monitor the images and metal detection alarms on Television.

The RF modules used here are STT-433 MHz Transmitter, STR-433 MHz Receiver, HT640 RF Encoder and HT648 RF Decoder. The three switches are interfaced to the RF transmitter through RF Encoder. The encoder continuously reads the status of the switches, passes the data to the RF transmitter and the transmitter transmits the data.

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BLOCK DIAGRAM OF POWER SUPPLY

Step down T/F Bridge Rectifier Filter Circuit Regulator

Step down transformer is used to convert 240v into 12v supply then using Bridge Rectifier we obtained pulsated DC, then passing through Filter circuit where supply gets converted into Constant DC voltage then passing through Regulator where voltage is regulated to constant 5volts.

OutputIs

Obtained

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BLOCK DIAGRAM OF TRANSMITTER

SW1

SW2

SW3

SW4

Encoder HT640

RF Transmitter

STT - 433

Transmitter Block Diagram

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BLOCK DIAGRAM OF RECEIVER

Wireless Camera with voice transmission

RF DecoderRF Receiver

AT89S52

MCU

H-Bridge

L293D

Geared Motor - I

Geared Motor - II

11.0592MHz

Crystal Oscillator

Power – On Reset

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CIRCUIT DIAGRAM OF POWER SUPPLY

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CIRCUIT DIAGRAM OF TRANSMITTER

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CIRCUIT DIAGRAM OF RECEIVER

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COMPONENT USED

1) Microcontroller (AT89s52).

2) Wireless Camera.

3) DC Motors (12volt, 2amp).

4) Motor Driver (L293D).

5) Decoder (HT-648).

6) Encoder (HT-640).

7) Robot Chassis.

8) Wireless Antenna.

9) DIP Switches.

10) Resistors.

11) Capacitors.

12) Printed Circuit Board.

13) RF Transmitter (STT 433 MHz).

14) RF Receiver (STR 433 MHz).

15) Voltage Regulator (7805, 7812).

16) Crystal Oscillator (11.0592 MHz).

17) LED.

18) Power Supply (12 volt).

19) Bridge Rectifier.

20) Keypad.

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WORKING

When we are pressing any key in remote controller the HT 640 generate 8 bit address and 4 bit data. Then the ASK transmitter sends the 8 bit address and 4 bit data to the receiver Then the ASK receiver receives the 8 bit address and 4 bit data and HT 648 decoder decodes the data, thus enabling the appropriate output. Thus the output signals that are generated controls the H-bridge which then rotates the motors.

The 433 MHZ ASK transmitter and receivers are extremely small, and are excellent for applications requiring short-range RF remote controls. The transmitter output is up to 8mW at 433.92MHz. The transmitter accepts both linear and digital inputs and can operate from 1.5 to 12 Volts-DC.

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APPLICATIONS

War field spying Robot with night vision wireless camera. War field land Rover that alerts on sensing planted Land ahead. Wireless operated Fire extinguisher vehicles with water jet spray. Bomb displacing robot with tension controlled soft catching arm. War field sage robot that alerts on sensing planted land mine ahead.

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ADVANTAGES

Not line of sight means it can move either directions. Not blocked by common materials. Longer range but depend on RF Module. Not light sensitive. Lighter weight.

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DIS-ADVANTAGES

Its Range is Long but regarding with the frequency range its Range has been fixed.

Use standard battery otherwise it will not work properly, as 2 dc motors have been used so they use heavy charge which can easily discharge the battery. So standard batteries have been used.

Not work properly when heavy fog condition occurred. Not able to use while Raining/Bad whether condition.

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REFERENCE

NAME OF THE SITES: -1. www.mitel.databook.com

2. www.atmel.databook.com

3. www.franklin.com

4. www.keil.com

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THANKYOU