It is an embedded system based application. The main design aspect

of CAN Based accident avoidance system project is to avoid the

accidents by using CAN protocol. This Project describes a design of

effective accident avoidance system that detects an automotive / vehicle /

car condition in traveling with the help of ultrasonic sensors and this

signal can be used to switch off the apply emergency hand brake or disc

brake with the help of which accident can be avoided.

INTRODUCTION

LITERATURE REVIEW

ADVANCE SYSTEMS FOUND IN

CARS

ABS

EBD

PARKING SENSORS

CRUISE CONTROL

In Present scenario maximum number of deaths is due to

accidents main reason for accidents are due to negligence of

drivers. In order to solve this problem we use can based

accident avoidance system which will collect traffic

information surrounding moving car and inform to driver in the

form of alarm.

NEED

LPC 2129POWER

SUPPLY

CAN

TRANSMITTER

ULTRASONIC

SENSOR

LPC2129POWER

SUPPLY

LCD BUZZER

CAN RECEIVER

TRANSMITTER SECTION

RECEIVER SECTION

CAN BASED ACCIDENT AVOIDANCE SYSTEM

An ultrasonic sensor transmit ultrasonic waves into

the air and detects reflected waves from an object.

There are many applications for ultrasonic sensors,

such as in intrusion alarm systems, automatic door

openers and backup sensors for automobiles.

ULTRASONIC SENSORS

FEATURES

Object detection includes zero range objects

2.5V to 5.5V supply with 2mA typical current draw

Readings can occur up to every 50mS, (20-Hz rate)

All interfaces are active simultaneously

9600Baud rate

It detect object from 0 inches to 254 inches with resolution of

1 inch

Sensor operates at 42KHz

Cost $ 25 per unit

ARM7TDMI PROCESSOR

The ARM7TDMI core is a member of the ARM family of

general-purpose 32-bit Microprocessors. The ARM family offers high

performance for very low power Consumption and small size. The

ARM architecture is based on Reduced Instruction Set Computer

(RISC) principles.

This simplicity gives:

A high instruction throughput

An excellent real-time interrupt response

A small, cost-effective, processor macro cell.

OVERVIEW OF LPC2129 MICROCONTROLER:

Clock Crystals • 12.0000 MHz crystal for maximum

execution speed and standard CAN bit

rates (5 x PLL = 60 Mhz CPU clock)

Dimensions 55 x 58 mm

Power On-board low-dropout voltage and

reset generation

• Generates +3.3V and +1.8V from a

+5V supply

• +3.3V available for external circuits,

up to 300 mA

• Power supply: 5 VDC

Program Flash 256 KB

Data Memory16 KB

Technical specification

Controller Area Network (CAN) is an advanced serial bus system that efficiently

supports distributed control system with a very high level of security

With the use of CAN, point - to - point wiring is replaced by one serial bus

connecting to all control systems

The CAN protocol uses the data link layer and the physical layer in the ISO_OSI

model

The CAN protocol handle bus accesses according to the concept called “Carrier

Sense Multiple Access with arbitration on message priority ". This arbitration Concept

avoids collisions of messages whose transmission was started by more than one node

simultaneously and makes sure the most important message is sent first without time loss

If two or more bus nodes start their transmission at the same time after having found

the bus to be idle, collision of the messages is avoided by bitwise arbitration. Each node

sends the bits of its message identifier and monitors the bus level

CAN CONTROLER:

In CAN protocol, two versions are available. They are version

2.0A CAN and version 2.0B CAN. Version 2.0A is original CAN

specifications specify an 11 bit identifier which allows 2^11(=2048)

different message identifiers and is known as standard CAN. Version

2.0B CAN contain 29 bit identifiers which allows 2^29 (over 536

million) message identifiers

CAN has the following properties:

Prioritization of messages

Guarantee of latency times

Configuration flexibility

Multicast reception with time synchronization

System wide data consistency

Error detection and error signaling

Message Priority Assignments (Reprinted from

ISO 11783-3 5.2.1):

Priority Field Number Priority Level000 0 - Highest

001 1

010 2

011 3

100 4

101 5

110 6

111 7 – Lowest

APPLICATION:

Used as a Warning System to avoid Collision in National Highways

Used by Police to Track the speed of the approaching vehicles

Used to detect an object in Extreme conditions like Fog and misty areas

Can be implemented in Robotic Applications

Can be used in large vehicles like Trucks and buses

Can be implemented in Aircraft and aerospace electronics

Can be used in Passenger and cargo trains

CONCLUSION

This project CAN BASED ACCIDENT AVOIDANCE

SYSTEM is intended for secure and smooth journey. The car/

vehicle itself is aware of its movement. If the driver himself is

not concentrating on driving or any other parameters, which

may cause damage to vehicle as well a life, this intelligent car/

vehicle warn the driver regarding the danger ahead

Accident avoidanve using controller area network protocol

Engineering

Transcript of Accident avoidanve using controller area network protocol