HRLV-ShortRange
-
EZ Series
High Resolution, Precision, Low Voltage Ultrasonic Range Finder
MB1603, MB1604, MB1613, MB1614, MB1623, MB1624, MB1633, MB1634, MB1643, & MB1644
5
®
™
HRLV-ShortRange
®
-
EZ
™
Series
The HRLV-ShortRange-EZ sensor line is the most cost-effective solution for close range
applications where precision range-finding, low-voltage operation, and low-cost are
needed. This sensor component module allows users of other more costly precision
rangefinders to lower the cost of their systems without sacrificing performance.
The HRLV-ShortRange-EZ sensor line provides high accuracy and high resolution ultrasonic proximity detection
and ranging in air, in a package less than one cubic inch. This sensor line features 1-mm resolution, target-size and
operating-voltage compensation for improved accuracy, superior rejection of outside noise sources, internal speed-
of-sound temperature compensation and optional external speed-of-sound temperature compensation. This
ultrasonic sensor detects large objects from 1-mm
6
to 5-meters, senses range to objects from 2-cm to 5-meters. The
interface output formats are pulse width, analog voltage, and serial digital in RS232. Factory calibration is
standard.
1
See Close Range Operation
Precision Range Sensing
•
•
•
•
•
•
Easy to use interface with distance
•
Target size compensation provides
•
•
•
•
•
provided in a variety of outputs
•
Range-finding at a fraction of the cost of
•
Operating voltage from 2.5V to 5.5V
4
•
Nominal current draw of 2.5mA at 3.3V,
and 3.5mA at 5V
•
Low current draw reduces current
drain
other precision rangefinders
Reading-to-reading stability of 1-mm at 1
-meter
is typical
Accuracy is factory-matched at 1-meter
to 0.2% providing a typical large target
accuracy of 1% +/-3-mm for most
voltages and uses
2
Calibrated acoustic detection zones
allows selection of the part number that
matches a specific application
Compensation for target size variation
and operating voltage range
Standard internal temperature
compensation and optional external
temperature compensation
Pulse width, (1uS/mm)
Analog Voltage, (5mm resolution)
RS232 Serial, (at TTL voltage levels)
TTL Serial
greater consistency and accuracy when
switching targets
for battery operation
Sensor automatically handles acoustic
•
Fast first reading after power-up
noise
2,3
eases battery requirements
Sensor ignores other acoustic noise
sources
Small and easy to mount
Calibrated sensor eliminates most sensor
to sensor variations
Very low power ranger, excellent for
multiple sensors or battery based systems
General Characteristics
mounting
5-meters
•
Low-cost ultrasonic rangefinder
•
Size less than 1 cubic inch with easy
•
Object proximity detection from 1-mm to
•
Resolution of 1-mm
•
Excellent Mean Time Between Failure
•
•
•
Notes:
1
2
Range Outputs
•
•
•
•
Easy to Use Component
Module
•
Gracefully handles other ultrasonic
•
sensors
3
•
Stable and reliable range readings and
excellent noise rejection make the sensor
easy to use
(MTBF)
Triggered operation yields a real-time
100mS measurement cycle
Free run operation uses a 2Hz filter, with
100mS measurement and output cycle
Actual operating temperature range from
–40°C to +65°C, Recommended
operating temperature range from
-15°C
to +65°C, provided proper frost
prevention is employed
4
See Close Range Operation
Users are encouraged to evaluate the sensor
performance in their application.
3
See page 6 for multi-sensor operation.
4
Please reference page 5 for minimum
operating voltage verses temperature
information.
5
Please reference page 16 for part number key.
6
Small and/or angled targets may have limited
detection at distances less than 2cm.
Close Range Operation
Applications requiring 100% reading-to-reading reliability should not use MaxSonar sensors at a distance closer than
2cm. Although most users find MaxSonar sensors to work reliably from 0 to 2cm for detecting objects in many
applications, MaxBotix
®
Inc. does not guarantee operational reliability for objects closer than the minimum reported
distance. Because of ultrasonic physics, these sensors are unable to achieve 100% reliability at close distances.
_______________________________________________________________________________________________________________________________________
Warning: Personal Safety Applications
We do not recommend or endorse this product be used as a component in any personal safety applications. This product is
not designed, intended or authorized for such use. These sensors and controls do not include the self-checking redundant
circuitry needed for such use. Such unauthorized use may create a failure of the MaxBotix
®
Inc. product which may result
in personal injury or death. MaxBotix
®
Inc. will not be held liable for unauthorized use of this component.
MaxBotix
®
Inc.
MaxBotix Inc., products are engineered and assembled in the USA
Copyright 2005
-
2021 MaxBotix Incorporated
Patent 7,679,996
Page 1
Web:
www.maxbotix.com
PD15029b
Applications & Uses
•
•
•
•
Proximity zone detection
People detection
Robots ranging sensor
Autonomous navigation distance
measuring
•
Long range object detection
•
Automated factory systems
•
This product is not recommended as
a device for personal safety
•
Designed for protected indoor envi-
ronments
•
Motion detectors
•
Limited tank level measurements
HRLV-ShortRange
®
-
EZ
™
Series
•
Box dimensions
•
Environments with acoustic and elec-
trical noise
•
Height monitors
•
Auto sizing
Pin Out Description
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
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
20uS for 20-mm
to 5000uS for 5000-mm. Pulse width output is +/- 1% of the serial data sent.
Pin 3- Analog Voltage Output:
On power-up the voltage on this pin, V
observed
, is set to 0V. After which, the voltage on
this pin has the voltage corresponding to the latest measured distance. This distance can be calculated with the following
equation: distance = [V
observed
/ ((Vcc/1024) * 6)]
-
300. (This output voltage is referenced to GND, Pin 7.) The analog
voltage output is typically within ±10-mm of the serial output.
Using a 10bit analog to digital convertor, one can read the analog voltage bits (i.e. 0 to 1023) directly and multiply the
number of bits in the value by 6 and subtract 300 to yield the range in mm. For example, 54 bits corresponds to 24-mm
where (54 * 6)
-
300 = 24-mm.
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 HRLV-ShortRange-EZ 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 100mS.
Filtered Range Data:
When pin 4 is left high, the sensor will continue to range every 100mS, but the output will pass
through a 2Hz filter, where the sensor will output the range based on recent range information.
Pin 5-Serial Output:
By default, the serial output is RS232 format (0 to Vcc) with a 1-mm resolution. 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. The serial output is the most accurate of the range outputs.
Serial data sent is 9600 baud, with 8 data bits, no parity, and one stop bit.
V+ Pin 6
-
Positive Power, Vcc:
The sensor operates on voltages from 2.5V
-
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.) Please reference page
5 for minimum operating voltage verses temperature information.
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
then outputs a range reading.
Auto Calibration
Each time the HRLV-ShortRange-EZ takes a range reading, it calibrates itself. The sensor uses this data to range objects.
If the temperature, humidity, or applied voltage changes during sensor operation; the sensor will continue to function
normally over the rated temperature range while applying compensation for changes caused by temperature and voltage.
MaxBotix
®
Inc.
MaxBotix Inc., products are engineered and assembled in the USA
Copyright 2005
-
2021 MaxBotix Incorporated
Patent 7,679,996
Page 2
Web:
www.maxbotix.com
PD15029b
Sensor Operation: Free-Run
HRLV-ShortRange
®
-
EZ
™
Series
When operating in free run mode, most range readings are accurately reported. If the range readings are affected, the
effect is typically less than 5 mm. This allows users to employ real-time ultrasonic distance sensing without the need for
additional supporting circuitry or complicated user software.
Many acoustic noise sources will have little to no affect on the reported range of the HRLV-ShortRange-EZ sensors.
However, users are encouraged to test sensor operation in the operating environment.
Sensor Minimum Distance
The sensor minimum reported distance is 2-cm (0.8 inches). However, the HRLV-ShortRange-EZ will detect targets to
within 1-mm of the front sensor face. Large targets closer than 2-cm will typically range as 20-mm.
Sensor Operation from
2-cm
to 50-cm
Because of acoustic phase effects in the near field, objects between 2-cm and 50-cm may experience acoustic phase
cancellation of the returning waveform resulting in inaccuracies of up to 3-mm. These effects become less prevalent as the
target distance increases, and has not been observed past 50-cm. For this reason, industrial users that require the highest
sensor accuracy are encouraged to mount the HRLV-ShortRange-EZ from objects that are farther than 50-cm.
Range
“0”
Location
The HRLV-ShortRange-EZ reports the range to distant targets starting from the front of the transducer.
Range Zero 0.0-mm
The range is measured from the front of the transducer to the target
Target Face
In general, the HRLV-ShortRange-EZ will report the range to the leading edge of the closest detectable object. Target
detection has been characterized in the sensor beam patterns.
Target Size Compensation
Most low cost ultrasonic rangefinders will report the range to smaller size targets as farther than the actual distance. In
addition, they may also report the range to larger size targets as closer than the actual distance.
The HRLV-ShortRange-EZ sensor line correctly compensates for target size differences. Provided an object is large
enough to be detected, the sensor will report the same distance, typically within 2%, regardless of target size. Smaller
targets can have additional detection noise that may limit this feature. In addition, targets with small or rounded surfaces
may have an apparent distance that is slightly farther, where the distance reported may be a composite of the sensed
object(s). Compensation for target size is applied to all outputs: pulse width, analog voltage, and serial RS232 or TTL.
Selecting a HRLV-ShortRange-EZ
The HRLV-ShortRange-EZ product line offers varied sensitivity to allow you to select the best sensor to meet your needs.
The diagram below shows how each product balances sensitivity and noise tolerance. This does not affect the maximum
range, pin outputs, or other operations of the sensor. To view how each sensor will function to different sized targets
reference the HRLV-ShortRange-EZ-Beam Patterns.
Part Number
MB1603
MB1613
MB1623
MB1633
MB1643
MB1604
MB1614
MB1624
MB1634
MB1644
Serial
Interface
RS232
RS232
RS232
RS232
RS232
TTL
TTL
TTL
TTL
TTL
People
Detection
Yes
Yes
Wide
Beam
Yes
Yes
High
Sensitivity
Yes
Yes
Best
Balance
Yes
Yes
Yes
Large
Targets
Narrow
Beam
Noise
Tolerance
5 Meter
Range
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
MaxBotix
®
Inc.
MaxBotix Inc., products are engineered and assembled in the USA
Copyright 2005
-
2021 MaxBotix Incorporated
Patent 7,679,996
Page 3
Web:
www.maxbotix.com
PD15029b
Supply Voltage Droop and Charge Compensation
HRLV-ShortRange
®
-
EZ
™
Series
During power up, the HRLV-ShortRange-EZ sensor line will calibrate itself for changes in supply voltage. Additionally,
the sensor will compensate if the supplied voltage gradually changes.
If the voltage applied to the sensor changes faster than 0.5V per second, it is best to remove and reapply power.
The sensor requires noise free power for best operation. If the sensor is used with noise on the supplied power, the
readings may be affected. Typically adding a 100uF capacitor at the sensor between the V+ and GND pins will correct
most power related electrical noise issues.
_______________________________________________________________________________________________________________________________________
Mechanical Dimensions
_______________________________________________________________________________________________________________________________________
A
B
C
1.498”
0.875”
0.102”
38.05-mm
22.23-mm
2.59-mm
D
E
F
0.104”
0.670”
1.210”
2.64-mm
17.02-mm
30.73-mm
G
H
I
J
0.700”
0.510”
0.069”
0.169”
17.78-mm
12.95-mm
1.75-mm
4.29-mm
K
L
M
N
0.125 dia.
0.040”
dia.
0.053”
0.625”
3.18-mm
1.02-mm
1.35-mm
15.88-mm
K
L
M
N
0.125 dia.
0.040”
dia.
0.053”
0.625”
3.18-mm
1.02-mm
1.35-mm
15.88-mm
O
P
Q
R
0.580”
0.700”
0.343”
0.427”
13.97-mm
17.78-mm
8.71-mm
10.85-mm
Weight 8 Grams
Temperature Compensation
On Board
-
Internal Temperature Compensation
The speed of sound in air increases about 0.6 meters per second, per degree centigrade. Because of this, each HRLV-
ShortRange-EZ is equipped with an internal temperature sensor which allows the sensor to apply a compensation for
speed of sound changes.
The self heating (15mW at 5V, or 8mW at 3.3V) will change the temperature of the sensor by about 1 degree C. The
amount of self heating is dependent upon user mounting.
Most importantly, the actual air temperature of the path between the sensor and the target may not match the temperature
measured at the sensor electronics. Sensors mounted in vertical applications, or applications where the environmental
temperature gradient is severe, may experience a large temperature measurement error which will affect the sensor
accuracy. For example, buildings with a height of 2-meters can have floor to ceiling temperature variations of 5°C or
more. Because of these temperature affects, users desiring the highest accuracy output are encouraged to use a properly
mounted external temperature sensor or to manually account for this measurement error.
HR-MaxTemp
®
External Temperature Sensor
Although the HRLV-ShortRange-EZ has an internal temperature sensor; for best accuracy users are encouraged to use the
optional external temperature sensor. On power-up the HRLV-ShortRange-EZ will automatically detect an attached
HR-MaxTemp temperature sensor and begin to apply temperature compensation using the external temperature sensor.
The external temperature sensor allows for the most accurate temperature compensation by eliminating sensor self-heating
from the sensor electronics; and by allowing the user to place the temperature sensor closer to the center of the acoustic
ranging path.
For best results connect the temperature sensor midway between the HRLV-ShortRange-EZ and the expected target.
MaxBotix
®
Inc.
MaxBotix Inc., products are engineered and assembled in the USA
Copyright 2005
-
2021 MaxBotix Incorporated
Patent 7,679,996
Page 4
Web:
www.maxbotix.com
PD15029b
Voltage vs Temperature
HRLV-ShortRange
®
-
EZ
™
Series
The graph below shows minimum operating voltage of the sensor verses temperature.
MaxBotix
®
Inc.
MaxBotix Inc., products are engineered and assembled in the USA
Copyright 2005
-
2021 MaxBotix Incorporated
Patent 7,679,996
Page 5
Web:
www.maxbotix.com
PD15029b
51mcu
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