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MAJOR PROJECT PRESENTATION

Audio & Video Capture ROBOT

Using RF Communication

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INTRODUCTION

This robot is controlled by a RF remote. It can be moved forward and reverse direction using geared motors of 60RPM with 6 volt DC. Also this robot can take sharp turnings towards left and right directions. This project uses ATMEGA16 MCU of AVR series.

The RF modules used here are STT-433 MHz Transmitter, STR-433 MHz Receiver, HT12E as RF Encoder and HT12D as RF Decoder. Four 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.

Also we use Wireless Camera in our project so everything which camera captures it will display on Television by connecting camera receiver to TV.

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COMPONENT USED Printed Circuit Board. Microcontroller

(ATMEGA16). DC Motors (9volt,

1.5amp). Motor Driver (L293D). Wireless Camera. RF Module (Tx, Rx). Decoder (HT12D). Zener Diode.

Encoder (HT12E). Crystal Oscillator (16.0

MHz). Resistors. Capacitors. Voltage Regulator (7805). LED’s. Power Supply (9 volt). Keypad.

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BLOCK DIAGRAM OF POWER SUPPLY

Step down T/F Bridge Rectifier Filter Circuit

Regulator

OutputIs

Obtained

INPUTO/P

Step down transformer Bridge rectifier Filter Regulator

POWER SUPPLY

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BLOCK DIAGRAM OF TRANSMITTER

SW1

SW2

SW3

SW4

Encoder HT12E

RF Transmitter

STT - 433

Transmitter Block Diagram

ANTENNA

Power Supply

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CIRCUIT DIAGRAM OF TRANSMITTER

PCB LAYOUT OF RF TRANSMITTER

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BLOCK DIAGRAM OF RECEIVER

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RF Receiver

STR-433 RF Decoder

HT12D

Decoded to 4 Bit Data

Which is given MCU

1 Bit DataFrom TxSection

Power Supply

Receiver Block Diagram

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CIRCUIT DIAGRAM OF RECEIVER

PCB LAYOUT OF RF RECEIVER

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AVR MICROCONTROLLER

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It consists of Four port, each port contains 8 pins.

Up to 16 MIPS Throughput at 16 MHz.

16K Bytes of In-System Self-Programmable Flash.

1K Byte Internal SRAM.

32 Programmable I/O Lines.

Inbuilt 8-bit ADC.

No need of External Pullup Resistor.

MOTOR DRIVER (L293D)

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This circuit represents L293D which is motor driver circuit used to rotate 2 different motors.

In this figure pin no. 1, 9 and 16 are connected to 5 volt power supply.

Pin no. 8 is connected to 9 volt. Pin no. 4,5,12 and 13 is short

circuit and is connected to GND. One pin of motor is connected to

pin no. 3 and other pin is connected to pin no. 6 of L293D, same in another section of L293D.

And motor is drive through output from Microcontroller to pin no. 2,7,10 and 15.

RF MODULES Specifications: - Receiver Supply

voltage: 5V. Receiver IF

frequency: 500 KHz. Receiver Sensitivity:

-105dBm. Receiver Supply

current: 2.3mA. Output power:

4~16dBm. Frequency 434 MHz.

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PROGRAMMING MODULES Delay: – In this module delay program is made which is

used to provide delay to microcontroller for continuing any particular work.

Forward: - In this module we program microcontroller to drive both the motors in forward direction.

Backward: - In this module we program for driving both motors in Backward direction.

Right: - In this module, microcontroller is programmed to drive motors in Right direction.

Left: - In this module, motors drive in left direction. Stop: - In this module, both motors stops. Main Program: - In this module, all above functions

are called one by one, according to the input which is coming through RF Receiver.

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CIRCUIT DIAGRAM OF BASIC AVR

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PCB LAYOUT OF BASIC AVR CIRCUIT

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WORKING

Wireless Camera with voice transmission

RF Decoder

HT12D

RF Receiver

STR-433

ATMEGA16

MCU

H-Bridge

L293D

Geared Motor - I

Geared Motor - II

16.0 MHz

Crystal Oscillator

Power – On Reset

RF Encoder

HT12E

RF Transmitter

STT-433

Keypad

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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.

Longer range 100 meter.

Lighter weight.

Low power consumption, Operating voltage: 5 Volts.

Data rate 200bps to 3Kbps depending on the supply.

Operating temperature range: -40 to 80 °C.

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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.

OUR PROJECT PHOTO

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PHOTO OF TRANSMITTER

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THANKYOU

ANY Queries

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