EMBEDDED WIRELESS DATA ACQUISITION SYSTEM FOR UNMANNED VEHICLE IN

UNDERWATER ENVIRONMENT

PRESENTED BYREVATHI. D(12TC0043)

INTRODUCTION

Underwater Robots gather information which is difficult for human being.

Used by scientific communities to study the ocean, freshwater & underwater environment

ZigBee is used for wireless network and monitoring applications.

OBJECTIVES

To design a wireless underwater robot security purpose for understanding water environment with the help of electronics, motion control and sensor system.

Manual water Sampling labour, limited special and temporal variations, highly affected by bad weather conditions, resource, and time intensive.

Water outlining Tracking Boundary Monitoring Mapping

BLOCK DIAGRAM OF ROBOT MODEL

UNDER WATER VEHICLE

Three Types of Underwater Vehicles are

Remote operated vehicle (RUV's) Unmanned underwater vehicle

(UUV's) Autonomous Underwater Vehicle

(AUV's)

WORKING PRINCIPLE OF ROBOT

DC MOTOR is used for controlling the movement of robot with small coil for rotating purpose.

Robot direction is controlled by ZigBee with help of microcontroller.

DESIGNING PROCESS REQUIREMENT

CAMERAS MOTORS RELAYS MICROCONTROLLER –PIC16F877 RS232 POWER SUPPLY

WIRELESS PINECOM CAMERA

Transmits clear sharp colour live time video to the receiver unit up to 300 feet apart

(Line Of Sight)

MOTOR UNIT

To make the robot mobile, we need motors, wheels, casters or tracks. The motors are controlled by relay and driver circuit.

The series combination of resistor and capacitor is called as Snubber circuit.

When the relay is turn ON and turn OFF continuously, the back EMF may fault the circuit. So the back EMF is grounded through the Snubber circuit.

CIRCUIT FOR MOTOR WITH RELAY

RELAY CIRCUIT

RS232

The voltage level that corresponds to logical one and logical zero for the data transmission & control signal lines.

Valid signals are either in the range of+3 to +15 volts or the range -3 to -15 volts with respect to either the ground/common pin

MICROCONTROLLER

The Microcontroller used is PIC16F877. Flash type reprogrammable microcontroller. Programmed using embedded C language. Calculates the corresponding time to

distance measurement & it on the computer.

Interfacing is done through serial ports. RISC based - fabricated in CMOS – immune

to noise.

TOOLS FOR DEVELOPMENT AND DATAAQUISITION

ZigBee is a specification for suite of high level communication protocols

Used for creating personal area networks.

Based on IEEE 802.15 standard. Transmits data over long distance by

passing the data through intermediate devices to reach more distant ones, by creating a mesh network.

CONTINUED....

ZigBee Specification:

Input present at PORTD of transmitter Atmega8 is transmitted wirelessly to the PORTD of receiver

Atmega8

ULTRASONIC SENSORS

Non-Contact distance measurements are about 2 cm to 3 meters

Transmits an ultrasonic burst and provides output pulse that corresponds to the time required for the burst echo to return to the sensor.

By measuring the echo pulse width,the distance of the target can easily be calculated.

By replacing these sensors with sonar, the underwater monitoring will be possible.

TEMPERATURE SENSOR

Thermistor is used for measuring the temperature of underwater.

Types of temperature

Positive Temperature Coefficient. Negative Temperature Coefficient.

OUTCOMES

Effective data acquisition for underwater environment.

Provides subsurface data on a larger scale and higher frequency than traditional UIN at a cheaper budget and sustainable to all weather conditions

Gathering ocean, fresh water, unclean water, dirty water data in real-time will be very cost effective will be obtained.

CONTINUED...

High performance UUV that can provide continuous efficient water monitoring.

The long endurance enables the UUV to explore underwater bodies, acquiring data over large areas.

When at surfaces, it will send collected data to shore and receives new commands via the ZigBee wireless technology.

CONTINUED...

Data acquisition will help the government, municipality corporations for monitoring the cleanliness of rivers, tanks, dams, sewage blockages.

By replacing RF with sonar, underwater images in unclear water which could not be seen by cameras can also be seen clearly.

REFERENCES

[1]Peng Xuange,Xia Jiewu. Liao Jinming an Embedded Internet interface system, Control & Automation. Vo21, No 10,2005

[2] Chatschik Bisdikian, "An Overview of the Bluetooth Wireless Technology," IEEE Communications Magazine, Dec. 2001

[3] Doukkali, H, Nuaymi, L (2005). "Analysis of MAC protocols for Underwater sensor networking" Vehicular Technology Conference. VTC 2005-sping. 2005 IEEE 6lst, vol. 2. pp. 1307-1311.

[4] Liu, L, Zhou, S, Cui, J (2008) "Prospects and Problems of

Communication for Underwater Sensor Networks" Wiley Wireless Communications and Mobile Computing, Special Issue on Underwater Sensor Networks. vol. 8, no. 8, pp. 977-994.

THANK YOU