Parallax PING))) 28015 - Technical Details and Operation; Dimensions; Communication Protocol and Timing

Copyright © Parallax Inc. PING))) Ultrasonic Distance Sensor (#28015) v2.0 2/4/2013 Page 2 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
OUT
2 µs (min), 5 µs typical
PING)))
Sensor
Echo Holdoff t
HOLDOFF
750 µs
Burst Frequency t
BURST
200 µs @ 40 kHz
Echo Return Pulse Minimum t
IN-MIN
115 µs
Echo Return Pulse Maximum t
IN-MAX
18.5 ms
Delay before next measurement 200 µs