Car Reverse Alarm, Automobile Project

1. CAR REVERSE ALARM
SYNOPSIS
The objective of this project is to give the reverse alarm for vehicle
using the ultrasonic sensor. This project is very useful in vehicle for reverse
purpose and indicates through alarm. Reverse Backing Systems backup
sensors are the answer to your problem. Using ultrasonic waves, the sensors
(whether mounted in the bumper or license plate frame) detect objects
behind you and transmit a signal to either the LCD screen or speaker
depending on the kit that is chosen. Make your daily drive a little easier with
Reverse Backup Sensors from Reverse Backing Systems. This project is
designed by following blocks Micro controller, ultrasonic sensor, Driver
circuit, alarm.

2. BLOCK DIAGRAM
WORKING PRINCIPLE
The ultrasonic wave is spread in the air and hit the nearest object and
reflected from the object which is received by the ultrasonic receiver. These
electrical signals are very small mill voltage signal, so it is given to amplifier
circuit. The amplifier circuit is constructed with operational amplifier which
acts as power amplifier. Then the amplifier signal is given to signal
conditioning unit which also constructed with operational amplifier. In this
circuit operational amplifier acts as a comparator and generates the square
pulse given to control unit. As per program the relay driver circuit will be

3. activated. The driver circuit is constructed with transistor which acts as
switch to turn ON and turn OFF the alarm.
From this, the microcontroller monitors object present or not and the
car. So if the car comes near the wall or any object the alarm makes the
sound for to indicate the driver to stop the vehicle.
ADVANTAGES
 Low power consumption
 Easy to handle the car
 Less cost when compared to other devices
DISADVANTAGE
It may create irritation to other drivers.
APPLICATIONS
 Applicable in all automobiles and very useful for learners.
 Can be implemented in all automobiles to increase the automation
involved.

4. DRAWING FOR CAR REVERSE ALARM