Datasheet

Page 2
Web: www.maxbotix.com
PD11500c
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar
®
- WR/WRC
™
Series
MaxBotix Inc., products are engineered and assembled in the USA.
HRXL-MaxSonar
®
-WR
™
Circuit
The sensor functions using a variety active components which create an excellent
ultrasonic sensor solution. The schematic is shown to provide the user with
detailed connection information.
__________________________________________________________________________________________
HRXL-MaxSonar
®
-WR
™
Pin Out
Pin 1- Temperature Sensor Connection: Leave this pin unconnected if an
external temperature sensor is not used. For best accuracy, this pin is optionally
connected to the HR-MaxTemp temperature sensor. Look up the HR-MaxTemp
(MB7955, MB7956, MB7957, MB7958, MB7959) temperature sensor for
additional information.
Pin 2- Pulse Width Output: This pin outputs a pulse width representation of the
distance with a scale factor of 1uS per mm. Output range is 300uS for 300-mm to
5000uS for 5000-mm. Pulse width output is sent with a value within 0.5% of the
serial output.
Pin 3- Analog Voltage Output: After the ~50ms power up initialization, the
voltage on this pin is set to 0V. Once the sensor receives a range value the voltage
on this pin has the voltage corresponding to the latest measured distance. This pin
outputs an analog voltage scaled representation of the distance.
The sensors use a scale factor of (Vcc/5120) per 1-mm. The distance is output with a 5-mm resolution. This output
voltage is referenced to GND). The analog voltage output is typically within ±5-mm of the serial output.
Pin 4- Ranging Start/Stop: This pin is internally pulled high. If this pin is left unconnected or held high, the sensor will
continually measure and output the range data. If held low, the HRXL-MaxSonar-WR will stop ranging. Bring high for
20uS or longer to command a range reading.
Real-time Range Data: When pin 4 is low and then brought high, the sensor will operate in real time and the first reading
output will be the range measured from this first commanded range reading. When the sensor tracks that the RX pin is low
after each range reading, and then the RX pin is brought high, unfiltered real time range information can be obtained as
quickly as every 133mS (MB7360, MB7367, MB7380, MB7380) or 148mS (MB7369, MB7389).
Filtered Range Data: When pin 4 is left high on the sensors, the sensors will continue to range every 133mS (MB7360,
MB7367, MB7380, MB7380), the data output includes a 1.5Hz filter. The HRXL-MaxSonar-WRM will continue to range
every 148mS (MB7369, MB7389), the data output includes a 1.33Hz filter. The sensors will output the range based on
recent range information. The filter does not affect the speed at which data is made available to the user but instead
allows for more consistent range information to be presented.
Pin 5-Serial Output: The MB736X sensors have an RS232 data format (with 0 to Vcc levels) and the MB738X sensors
have a TTL outputs (with 0 to Vcc levels). The output is an ASCII capital “R”, followed by four ASCII character digits
representing the range in millimeters, followed by a carriage return (ASCII 13). The maximum distance reported is 5000
for the sensors. The baud rate is 9600, 8 data bits, no parity, with one stop bit (9600-8-N-1). Because the data is
presented in a binary data format, the serial output is most accurate .
V+ Pin 6 - Positive Power, Vcc: The sensor operates on voltages from 2.7V - 5.5V DC. For best operation, the sensor
requires that the DC power be free from electrical noise. (For installations with known dirty electrical power, a 100uF
capacitor placed at the sensor pins between V+ and GND will typically correct the electrical noise.)
GND Pin 7 – Sensor ground pin: DC return, and circuit common ground.
________________________________________________________________________________
About Ultrasonic Sensors
Our ultrasonic sensors are in air, non-contact object detection and ranging
sensors that detect objects within an area. These sensors are not affected
by the color or other visual characteristics of the detected object.
Ultrasonic sensors use high frequency sound to detect and localize objects
in a variety of environments. Ultrasonic sensors measure the time of flight
for sound that has been transmitted to and reflected back from nearby
objects. Based upon the time of flight, the sensor outputs a range reading.
Features RS232 TTL
Most Likely
Filter
Compact
WRC
MB7360 Yes
MB7367 Yes Yes
MB7369 Yes Yes
MB7380 Yes
MB7387 Yes Yes
MB7389 Yes Yes
Part Number Features Chart