资料介绍
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:
• Autofocus cameras
• Motion detection
• Robotics guidance
• Proximity sensing
• Object ranging
This application note describes a method of interfacing
PIC16CXXX microcontrollers to the Polaroid 6500
Ranging Module. This implementation uses a
minimum of microcontroller resources, a CCP module
and two I/O pins. The two major components of the
system are:
• Microcontroller
• Polaroid 6500 Ranging Module
The microcontroller performs the intelligence and
arithmetic functions for ultrasonic ranging, while the
Polaroid 6500 Ranging Module performs the ultrasonic
signal transmissions and echo detection.M Implementing Ultrasonic Ranging
AN597
THEORY OF OPERATION
Author: Robert Schreiber
Microchip Technology Inc. Ultrasonic ranging entails transmitting a sound wave
and measuring the time that it takes for the sound wave
to reect off of an object and back to the origin. The
INTRODUCTION reection time is proportional to the distance that the
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