28029 Parallax Inc, 28029 Datasheet - Page 53
28029
Manufacturer Part Number
28029
Description
KIT PARTS SMART SENSORS W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28029.pdf
(340 pages)
Specifications of 28029
Accessory Type
Parts Kit
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® or Javelin Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
28029PAR
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Chapter 2: The Ping))) Ultrasonic Distance Sensor
The Ping))) sensor interfaced with a BASIC Stamp can measure how far away objects
are. With a range of 3 centimeters to 3.3 meters, it's a shoo-in for any number of robotics
and automation projects. It's also remarkably accurate, easily detecting an object's
distance down to the centimeter.
HOW DOES THE PING))) SENSOR WORK?
Figure 2-2 shows how the Ping))) sensor sends a brief chirp with its ultrasonic speaker
and measures the echo's return time to its ultrasonic microphone. The BASIC Stamp
starts by sending the Ping))) sensor a pulse to start the measurement. Then, the Ping)))
sensor waits long enough for the BASIC Stamp program to start a
Then, at the same time the Ping))) sensor chirps its 40 kHz tone, it sends a high signal to
the BASIC Stamp.
microphone, it changes that high signal back to low.
Figure 2-2: How the Ping))) Sensor Works
When the Ping))) sensor detects the echo with its ultrasonic
Chapter 2: The Ping))) Ultrasonic Sensor · Page 41
Figure 2-1
The Ping)))
Distance Sensor
™
Ultrasonic
PULSIN
command.
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