Parallax PING))) 28015 User Manual

Web Site: www.paral lax.com
Forums: forums.parallax.com
Sales: [e-mail]
Technical: [e-mail]

Office: [phone]
Fax: [phone]
Sales: [phone]
Tech Support: [phone]

PING))) Ultrasonic Distance Sensor (#28015)

The Parallax PING)))™ ultrasonic distance sensor provides precise, non-contact distance measurements
from about 2 cm (0.8 inches) to 3 meters (3.3 yards). It is very easy to connect to microcontrollers such
as the BASIC Stamp

The PING))) sensor works by transmitting an ultrasonic (well above human hearing range) burst and
providing an output pulse that corresponds to the time required for the burst echo to return to the
sensor. By measuring the echo pulse width, the distance to target can easily be calculated.

®

, Propeller chip, or Arduino, requiring only one I/O pin.

Features

Range: 2 cm to 3 m (0.8 in to 3.3 yd)


 Burst indicator LED shows sensor

activity

 Bidirectional TTL pulse interface on a

single I/O pin can communicate with 5 V
TTL or 3.3 V CMOS microcontrollers

 Input trigger: positive TTL pulse, 2 µs

min, 5 µs typ.

 Echo pulse: positive TTL pulse, 115 µs

minimum to 18.5 ms maximum.

Key Specifications

Supply voltage: +5 VDC


 Supply current: 30 mA typ; 35 mA max
 Communication: Positive TTL pulse
 Package: 3-pin SIP, 0.1” spacing

(ground, power, signal)

 Operating temperature: 0 – 70° C.
 Size: 22 mm H x 46 mm W x 16 mm D

(0.84 in x 1.8 in x 0.6 in)

 Weight: 9 g (0.32 oz)

 RoHS Compliant

Pin Definitions

GND Ground (Vss)
5 V 5 VDC (Vdd)
SIG Signal (I/O pin)

The PING))) sensor has a male 3-pin header used to supply
ground, power (+5 VDC) and signal. The header may be plugged
into a directly into solderless breadboard, or into a standard 3­wire extension cable (Parallax part #800-00120).

Copyright © Parallax Inc. PING))) Ultrasonic Distance Sensor (#28015) v2.0 2/4/2013 Page 1 of 9

Dimensions

Communication Protocol

The PING))) sensor detects objects by emitting a short ultrasonic burst and then "listening" for the echo.
Under control of a host microcontroller (trigger pulse), the sensor emits a short 40 kHz (ultrasonic) burst.
This burst travels through the air, hits an object and then bounces back to the sensor. The PING)))
sensor provides an output pulse to the host that will terminate when the echo is detected, hence the
width of this pulse corresponds to the distance to the target.

Host Device Input Trigger Pulse t
PING)))

Sensor

Echo Holdoff t
Burst Frequency t
Echo Return Pulse Minimum t
Echo Return Pulse Maximum t
Delay before next measurement 200 µs

Copyright © Parallax Inc. PING))) Ultrasonic Distance Sensor (#28015) v2.0 2/4/2013 Page 2 of 9

2 µs (min), 5 µs typical

OUT
HOLDOFF
BURST
IN-MIN
IN-MAX

750 µs

200 µs @ 40 kHz

115 µs

18.5 ms

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.

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:

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).
Percent error and conversion constant calculations are introduced in Chapter 2 of

Applications

www.parallax.com.



, a Stamps in Class text available for download from the 28029 product page at

m/sT0.6331.5C



Cair

Smart Sensors and

Copyright © Parallax Inc. PING))) Ultrasonic Distance Sensor (#28015) v2.0 2/4/2013 Page 3 of 9