28015 Parallax Inc, 28015 Datasheet - Page 3

• Manufacturer Part Number: 28015
• Description: Optical Sensor Development Tools PING))) DISTANCE SENSOR ULTRASONIC
• Manufacturer: Parallax Inc
• Series: PING)))™r

Specifications of 28015

• Operating Voltage: 5 V
• Operating Current: 30 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Description/function: Proximity Sensor
• Sensing Distance: 0.787" ~ 118.110" (20mm ~ 3m) ADJ
• Sensor Type: UltraSonic
• Sensing Object: Metallic and Non-Metallic
• Response Frequency: 40kHz
• Material - Body: -
• Shielding: Unshielded
• Voltage - Supply: 5V
• Output Type: Pulse Output
• Terminal Type: 3-Wire
• Package / Case: 3-SIP
• For Use With/related Products: Basic Stamp
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Practical Considerations for Use
Object Positioning
The PING))) sensor cannot accurately measure the distance to an object that: a) is more than 3 meters
away, b) that has its reflective surface at a shallow angle so that sound will not be reflected back towards
the sensor, or c) is too small to reflect enough sound back to the sensor. In addition, if your PING)))
sensor is mounted low on your device, you may detect sound reflecting off of the floor.
a.
b.
c.
Target Object Material
In addition, objects that absorb sound or have a soft or irregular surface, such as a stuffed animal, may
not reflect enough sound to be detected accurately. The PING))) sensor will detect the surface of water,
however it is not rated for outdoor use or continual use in a wet environment. Condensation on its
transducers may affect performance and lifespan of the device. See the “Water Level with PING)))”
document on the 28015 product page at
www.parallax.com
for more information.
Air Temperature
Temperature has an effect on the speed of sound in air that is measurable by the PING))) sensor. If the
temperature (°C) is known, the formula is:
(
)
C
331.5
0.6
T
m/s
=
+
×
air
C
The percent error over the sensor’s operating range of 0 to 70 ° C is significant, in the magnitude of 11
to 12 percent. The use of conversion constants to account for air temperature may be incorporated into
your program (as is the case in the example BS2 program given in the Example Programs section below).
Smart Sensors and
Percent error and conversion constant calculations are introduced in Chapter 2 of
Applications
, a Stamps in Class text available for download from the 28029 product page at
www.parallax.com.
Copyright © Parallax Inc.
PING))) Ultrasonic Distance Sensor (#28015)
v1.5 2/15/2008 Page 3 of 12