This project involves developing a CAN-based collision avoidance system for vehicles. The system uses a collision avoidance sensor to measure the distance to the vehicle ahead and warns the driver if the distance is unsafe or if the driver is not paying attention. It communicates between nodes using the Controller Area Network protocol to stop a DC motor if an object is detected by the sensor. The system requires hardware components like an AVR microcontroller, MCP2515 CAN controller, MCP2551 transceiver, collision avoidance sensor and power supply components. It also requires software programming in embedded C using development tools like CodeVision.

2. This project CAN BASED COLLISION
AVOIDANCE SYSTEM(CAN) is intended for
secure and smooth journey.
 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.

3.  Due to the driver’s distraction, a serious collision accident
may occur if the driver can not react in time to brake.
 For the front-end collision avoidance subsystem, Collision
avoidance sensor is adopted to measure the distance with
respect to the previous car.
 For rear-end collision avoidance subsystem, the currently
available collision avoidance sensors for vehicles are
adopted for approaching cars with relatively low speed.

4. power train management system
 antilock braking system (ABS)
 acceleration skid control (ASC) system, etc,
 the functionality and wiring of these electric
control units (ECU) are getting more
complicated. Therefore, it is of great concern to
upgrade the traditional wire harness to a smart
car network.

5. The Controller Area Network (CAN) is a
Serial, Asynchronous, Multi-master
communication protocol for connecting
electronic control modules.
The CAN Network is a Peer to Peer Network
consisting of different nodes.

6. FEATURES
OF CAN
 Low cost
 Easy to implement
 peer to peer Network
 powerful Error Checking
 Higher Transmission Rates 1MBitps
 high immunity to external noise signals
 Today the CAN bus is also used as a field bus in general
automation environments

7. BLOCK DIAGRAM

8. CAN PROTOCOL
 Using CAN protocol we can send data from one
node to other node. Here we are having two nodes .
 Each node contains
 AT mega32 (AVR Controller)
 MCP2515 (CAN Controller)
 MCP2551 (CAN Transceiver)

9. CAN PROTOCOL
 In first node we are interfacing Collision avoidance
sensor to find the object.
 Second node contains DC motor
 If any object is found in front of Collision avoidance
sensor in node1, DC motor in node2 stops running by
using CAN protocol.
 For this two different application programs in AVR
studio are to be developed.

10.  An Embedded system is defined as, the
software code to interact directly with that
particular hardware what we built for a
particular/specific application.
 Software is used for providing features and
flexibility, Hardware
(Processors, ASICs, Memory) is used for
Performance & sometimes security.

11. Based on functionality and performance
embedded systems categorized as 4 types:
 1. Stand alone embedded systems
 2. Real time embedded systems
 3. Networked information appliances
 4. Mobile devices

12. REQUIREMENTS
HARDWARE
REQUIREMENTS
SOFTWARE REQUIREMENTS
Ø  PROGRAMMING IN
EMBEDDED C
 CODEVISION AVR C
COMPILER
 KEIL SOFTWARE

13. AVR CONTROLLER
 The ATmega32 is a low-power CMOS 8-bit
microcontroller based on the AVR enhanced RISC
architecture. Its features are:
 High-performance, Low-power AVR 8-bit
Microcontroller
 Advanced RISC Architecture
 131 Powerful Instructions – Most Single-clock Cycle
Execution
32 x 8 General Purpose Working Registers

14.  High Endurance Non-volatile Memory segments
On-chip Analog Comparator
 Power-on Reset and Programmable Brown-out Detection
 Internal Calibrated RC Oscillator
 Six Sleep Modes: Idle, ADC Noise Reduction, Power-save,
Power-down, Standby and Extended Standby
SPEED GRADES:
0 - 8 MHz for ATmega32L
0 - 16 MHz for ATmega32

15. PIN DESCRIPTION OF AVR

16.  Port A (PA7-PA0) :Port A serves as the analog
inputs to the A/D Converter.
 Port B (PB7-PB0): Port B is an 8-bit bi-directional
I/O port with internal pull-up resistors (selected for
each bit).
 Port C (PC7-PC0): Port C is an 8-bit bi-directional
I/O port with internal pull-up resistors.
 XTAL1: Input to the inverting Oscillator amplifier
and input to the internal clock operating circuit.
 XTAL2: Output from the inverting Oscillator
amplifier.

17. MCP2515
 MCP2515 is a stand-alone Controller Area Network (CAN)
controller that implements the CAN specification, version 2.0B.
 MCP2515 has two acceptance masks and six acceptance filters that
are used to filter out unwanted messages, thereby reducing the host
MCUs overhead.
FEATURES:
 Implements CAN V2.0B at 1 Mb/s
 Receive buffers, masks and filters
 Data byte filtering on the first two data bytes
 Three transmit buffers with prioritization
and abort features.
 High-speed SPI Interface (10 MHz)

18. MCP2551
The MCP2551 is a high-speed CAN, fault-tolerant
device that serves as the interface between a CAN
protocol controller and the physical bus.

19. FEATURES OF MCP2551
 Protection against damage due to short-circuit
conditions (positive or negative battery voltage)
 Protection against high-voltage transients
 Automatic thermal shutdown protection
 Up to 112 nodes can be connected
 High noise immunity due to differential bus
Implementation

20.  Liquid crystal displays (LCDs)
have materials which combine
the properties of both liquids
and crystals.
 They have a temperature range within which the
molecules are almost as mobile as they would be in a
liquid, but are grouped together in an ordered form
similar to a crystal.
 Since the LCD’s consume less power, they are compatible
with low power electronic circuits and can be powered
for long durations.

21.  The sensor is based on the principle
of Infrared Reflection. It makes use of
Infrared rays modulated at 38 kHz and
then receiving the reflected rays.
 When there’s an Obstacle in front of the
module, the IR rays are reflected back and
fall on the receiver making its output LOW,
which is otherwise HIGH.
COLLISION AVOIDANCE SENSOR

22. POWER SUPPLY COMPONENTS
 CAPACITORS (FILTER)
 REGULATOR
 BRIDGE RECTIFIER
 TRANSFORMER
 RESET BUTTONS

23. THANK Q