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AN597

Microchip Technology
Part Number AN597
Manufacturer Microchip Technology
Description Implementing Ultrasonic Ranging
Published Dec 20, 2006
Detailed Description www.DataSheet4U.com AN597 Implementing Ultrasonic Ranging Author: Robert Schreiber Logic Products Division THEORY OF O...
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AN597
AN597

Overview
www.
DataSheet4U.
com AN597 Implementing Ultrasonic Ranging Author: Robert Schreiber Logic Products Division THEORY OF OPERATION Ultrasonic ranging entails transmitting a sound wave and measuring the time that it takes for the sound wave to reflect off of an object and back to the origin.
The reflection time is proportional to the distance that the object is from the source.
In this implementation, the sound wave is transmitted and received from the same transducer.
Therefore, a blanking interval is required between signal transmission and reception to eliminate false echoes (i.
e.
, a transmitted signal being detected as its own echo).
INTRODUCTION Object ranging is essential in many types of systems.
One of the most popular ranging techniques is ultrasonic ranging.
Ultrasonic ranging is used in a wide variety of applications including: • • • • • Auto focus cameras Motion detection Robotics guidance Proximity sensing Object ranging CIRCUIT CONFIGURATION In this implementation, a PIC16C7...


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