SYNOPSIS
Until
well into the twentieth century, most devices developed for measuring distance
worked on the same principle. The measured distance is compared with a standard
unit of length. Other means are available. One of these is the measurement of
time taken by the sound wave to cover a certain distance. This sound normally
lies beyond human hearing. The ultrasonic sensor is used to measure the
distance in digital form and also automatically braking the vehicle when the
obstacle closer to the vehicle.
The aim is to design and develop a control system based an intelligent
electronically controlled automotive braking system is called “AUTOMATIC BRAKING SYSTEM”. This Braking system is consists of ultrasonic sensor, Control
Unit, Pneumatic breaking system. The Ultrasonic sensor is used to detect the
obstacle. There is any obstacle in the path, the ultrasonic sensor senses the
obstacle and giving the control signal to the breaking system. The pneumatic
breaking system is used to break the system.
In our project of ‘ULTRASONIC DISTANCE METER” is suitable
for measuring distances between 25 cm and about 6 m. The measured distance is
shown on a 3-digit liquid crystal display (LCD). The low current drawn by the
unit makes battery operation possible: ‘LO BAT’ reading on the LCD indicates
when the battery needs to be replaced. The block diagram of this meter is shown
in figurer. This is having the four major parts of the meter
A sender and A Receiver Timing and time reference section A counter with display
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