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Project 18: Ultrasonic Follow Smart Car
18.1: Ultrasonic Ranging
(1)Project Description
The ultrasonic sensor uses sonar to determine distance to an object like
bats do. It offers excellent non-contact range detection with high accuracy
and stable readings in an easy-to-use package. It comes complete with
ultrasonic transmitter and receiver modules.
The ultrasonic sensor is being used in a wide range of electronics projects
for creating obstacle detection and distance measuring application as well
as various other applications.
As the above picture shown, it is like two eyes. One is transmitting end, the
other is receiving end.
The ultrasonic module will emit the ultrasonic waves after trigger signal.
When the ultrasonic waves encounter the object and are reflected back,
the module outputs an echo signal, so it can determine the distance of
object from the time difference between trigger signal (TRIG)and echo
signal(ECHO).
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