TOPIC

MOBILE PHONE OPERATED SURVEILLANCE SYSTEM (MOSS)

GROUP MEMBERS• Deepthi Babu • Femi Joseph• Magniya Davis• Sree rekha K P

GUIDEMS. BABITHA U.B

THE CONCEPT

A terrestrial vehicle designed and developed specifically for surveillance operations. It can be controlled by a mobile phone device

The system is capable of detection of SMOKE or Gas. The Gas sensor is capable of detecting LPG, butane, smoke etc

EMBEDDED SYSTEM

An embedded system is a special purpose computer system, which is completely encapsulated by the device it controls. It is called “embedded” because the micro controller is inside some other system.

• An embedded system has specific requirements and performs pre-defined tasks unlike a general purpose personal computer.

• An embedded system is a combination of computer hardware and software and perhaps additional mechanical or other parts, designed to perform a dedicated function.

SOFTWARE

• The microcontroller AT89c51 is compatible with Intel 8051 core and the same instruction set can be utilized.

• The coding is done in assembly language in the form of sub routines.

CURRENT EXISTING SYSTEM

• A work on autonomous robot with gas sensor had been done by Achim Lilienthal as a part of project “sensors for mobile robot”.

• Robot was moved at a constant speed within the investigation area. It had follow a fixed rectangular path.

• But here the robot vehicle can be moved in any 2D direction according to instructions given through cell phone.

• An extension to this project can be made by making 3D motion possible, that is a flying robot.

The entire system is embedded with a microcontroller (89C51) for controlling purposes.

SYSTEM DESIGN

Communication between the user and the vehicle is established with a conventional mobile phone device

Navigation and maneuverability are controlled by the same device.

The driving mechanism of the MOSS consists of ordinary dc motors and powered by a 12v battery.

The vehicle is equipped with a gas sensor

SYSTEM DESIGN (Contd…)

Implementation Design

DTMF DECODER

AT89C51

SMOKE SENSOR

OP-AMP

LCD (16x 2 LINES)

FRONT MOTOR DRIVE

REAR MOTOR DRIVE

IR TRANSMITTER• The PULSES from the microcontroller is transmitted

using an IR transmitter. The internal timer of the microcontroller counts the pulses to detect the obstacle.

LCD• LCD serves as a useful interface for the user. The

most common type of LCD controller is the Hitachi 44780 which provides a relatively simple interface between microcontroller and LCD.The message to be displayed is send to the LCD through data-bus.

MICROCONTROLLER

• The microcontroller is the CPU of the system. The microcontroller continuously read data available pin of DTMF decoder.

• When this pin toggles, the CPU copy the data from DTMF decoder. This data is compared with a fixed data base.

• By doing this, the COU can understand the commands from the remote side.

• After detecting the command, the CPU generates appropriate control signals to the DC motor driver L293D.

• The motor is rotated and vehicle moves to the desired direction. The system reads the obstacle sensor before driving the motor.

• The pulses reflected from the obstacle are collected by TSOP 1738. The output of TSOP1738 is counted using internal counter zero.

• When the pulse count crosses 250, then micro controller identify the presence of obstacle and the motor will not be rotated in this situation.

Driver IC• The driver IC used here is L293D. It is used for

driving the motors without using the supply of microcontroller and avoids kick back in the controller pins.

• The microcontroller pins are connecting to motors through the driver IC.

• One motor has two input pins from the microcontroller. Using L293D, the motor directions will control.

Motor 1, Motor 2

• The two motors are used for crane movements, i.e. forward movement, backward movement, right movement, left movement and stop condition.

DTMF decoder• The control commands are sending from mobile

phone key pad. The key pressed on the pad is converted into a standard code known as DTMF code. These tones are sending to the remote end.

• A DTMF decoder is employed at the robot control stage. The DTMF decoder output is in BCD format.

• The IC HT9170B is used as DTMF decoder. The first stage of the decoder is a pre amplifier. The gain can be controlled by connecting a suitable resistor at GT pin (pin 3) of HT 9170B.

• The second stage of the decoder is band pass filter. The band pass filter split the DTMF tone into Low and High Frequency group.

• Then individual frequencies are identified by the decoder with the help of narrow band filters.

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PROXIMITY SENSOR

Circuit design

Application Areas

•This system is applicable to diverse exploration projects

•It can be controlled from any part of the world.

•If smaller hardware, then it is useful search into small holes and corners that cannot size human body

•It can be made a much more sophisticated surveillance system that makes it suitable for any sort of surveillance and exploration operations.

Application Areas (contd..)

Command signals

1.0DTMF

decoding environment

DTMF decoded data User

interface

DFD

Actuatorcommands

Robotvehicle

Sensordata

Instructioncommands

1.1DTMF

decoder

Decoded data Motor driver

commands 1.3Motor control system

Actuator commands

Gas sensor1.2

Chemical transducer

systemData

1.0 DTMF Decoder Environment

REFERENCE

• www.dialabc.com

• www.microcontroller.com

• www.engineersgarage.com