Download - Moss-1st Review Ppt
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TOPIC
MOBILE PHONE OPERATED SURVEILLANCE SYSTEM (MOSS)
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GROUP MEMBERS• Deepthi Babu • Femi Joseph• Magniya Davis• Sree rekha K P
GUIDEMS. BABITHA U.B
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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
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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.
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• 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.
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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.
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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.
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• 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.
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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.
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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…)
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Implementation Design
DTMF DECODER
AT89C51
SMOKE SENSOR
OP-AMP
LCD (16x 2 LINES)
FRONT MOTOR DRIVE
REAR MOTOR DRIVE
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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.
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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.
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• 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.
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• 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.
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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.
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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.
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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.
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• 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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<D o c > A
M O S S
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TSOP
PROXIMITY SENSOR
Circuit design
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Application Areas
•This system is applicable to diverse exploration projects
•It can be controlled from any part of the world.
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•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..)
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Command signals
1.0DTMF
decoding environment
DTMF decoded data User
interface
DFD
Actuatorcommands
Robotvehicle
Sensordata
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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
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REFERENCE
• www.dialabc.com
• www.microcontroller.com
• www.engineersgarage.com