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HRLV-EZ Ultrasonic Range Finder

Sensor Line

Indoor high performance ultrasonic precision rangefinders
RoHs Compliant

The high resolution HRLV‑MaxSonar‑EZ senors are high performance ultrasonic sensors with noise rejection, improved automatic calibration, and factory calibrated beam patterns. The HRLV‑MaxSonar‑EZ sensors have three outputs: Analog Voltage, Pulse Width, RS232 or TTL serial data.


Selecting a Product

MB1003 Ultrasonic Rangefinder
MB1003 Ultrasonic Rangefinder

MB1003 HRLV-MaxSonar-EZ0

The HRLV‑MaxSonar‑EZ0 has the widest and most sensitive beam pattern in the HRLV‑MaxSonar‑EZ sensor line. An excellent low cost choice for use where high sensitivity, wide beam, or people detection is desired. Price each $37.95. More on this sensor
MB1013 Ultrasonic Rangefinder
MB1013 Ultrasonic Rangefinder

MB1013 HRLV-MaxSonar-EZ1

The HRLV‑MaxSonar‑EZ1 is our an indoor ultrasonic high resolution sensor. The HRLV‑MaxSonar‑EZ1 is a great choice for use where sensitivity is needed along with side object rejection. Price each $34.95. More on this sensor
MB1023 Ultrasonic Rangefinder
MB1023 Ultrasonic Rangefinder

MB1023 HRLV-MaxSonar-EZ2

The HRLV-MaxSonar-EZ2 is a good compromise between sensitivity and side object rejection. Price each $34.95. More on this sensor
MB1033 Ultrasonic Rangefinder
MB1033 Ultrasonic Rangefinder

MB1033 HRLV-MaxSonar-EZ3

The HRLV‑MaxSonar‑EZ3 is a narrow beam sensor with good side object rejection. Price each $34.95. More on this sensor
MB1043 Ultrasonic Rangefinder
MB1043 Ultrasonic Rangefinder

MB1043 HRLV-MaxSonar-EZ4

The HRLV-MaxSonar-EZ4 is the narrowest beam width sensor that is also the least sensitive to side objects offered in the HRLV‑MaxSonar‑EZ sensor line. This sensor is an excellent choice for large target applications. Price each $34.95. More on this sensor
The HRLV-MaxSonar-EZ Sensors At a Glance
People Detection
Wide Beam
High Sensitivity

Best Balance
 Large Targets
Narrow Beam
Noise Tolerance

Different applications require different sensors. The HRLV‑MaxSonar‑EZ product line offers varied sensitivity to allow you to select the best sensor to meet your needs.

The diagram above shows how each product balances sensitivity and noise tolerance. This does not effect 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‑MaxSonar‑EZ Beam Patterns.

For further help in selecting a sensor use our Ultrasonic Sensor Selection Guide.

Sensor Line Specifications

  • Resolution of 1‑mm
  • 10Hz reading rate
  • Internal temperature compensation
  • Cost-effective solution where precision range-findings are needed
  • Sensor component allows users to lower the cost of their systems without sacrificing performance
  • 42kHz Ultrasonic sensor measures distance to objects
  • RoHS compliant
  • Read from all sensor outputs: Analog Voltage, RS232 or TTL Serial, and Pulse Width
  • Virtually no sensor dead zone, objects closer than 30 cm will typically range as 30 cm
  • Maximum range of 5000 mm (195 inches)
  • Tolerates outside noise sources
  • Operates from 2.5V-5.5V
  • Low 3.1mA average current requirement
  • Small, light weight module
  • Designed for easy integration into your project or product
  • Operational Temperature from -0C to +65C (+32F to +149F)
  • Real-time automatic calibration (voltage, humidity, ambient noise)
  • Option external temperature compensation HR‑MaxTemp
  • Firmware filtering for better noise tolerance and clutter rejection
  • Quote Request Form: For orders greater than 100 sensors

Easy to Use Ultrasonic Sensors

The HRLV‑MaxSonar‑EZ products are high resolution ultrasonic sensors, that provide a component module solution that offers easy to use outputs, no sensor dead zone, calibrated beam patterns, stable range readings, low power demands, and a host of other features detailed in the product datasheets.

1mm Resolution

The HRLV-MaxSonar-EZ Sensors offer calibrated 1 mm accuracy of 0.1% at 1 meter.

Internal Temperature Compensation

The speed of sound in air increases about 0.6 meters per second, per degree centigrade. Because of this, each HRLV‑MaxSonar‑EZ is equipped with an internal temperature sensor which allows the sensor to apply a compensation for speed of sound changes.

With the internal temperature sensor, range readings immediately (within twenty seconds) after power up are the most accurate, and this is ideal for battery applications where the sensor is powered off most of the time. The self heating (15mW at 5V, or 8mW at 3.3V) will change the temperature of the sensor by 3 degrees C or so. (The amount of self heating is also slightly dependent upon user mounting). As such, self heating will cause the sensor to read the actual air temperature inaccurately.

External Temperature Sensor

With the HR‑MaxTemp connected to the HRLV‑MaxSonar‑EZ line of sensors, realtime automatic temperature compensation is available. The HR-MaxTemp allows the HRLV‑MaxSonar‑EZ sensor to monitor the changes to air temperature while ignoring self-heating.

Self-heating is an issue with internal temperature sensors, where the temperature increase is typically 2 to 5 degrees centigrade. If ignored this will cause a drift of the reported of up to 3%.

The HRLV‑MaxSonar‑EZ is designed to used alongside the HR‑MaxTemp temperature sensor. On power-up the HRLV‑MaxSonar‑EZ will automatically detect an attached temperature sensor and begin to apply temperature compensation for the speed of sound changes to all range outputs.

The Interface

The HRLV‑MaxSonar‑EZ interface is designed to be very easy and intuitive to use. The interface output formats included are pulse width output, analog voltage output, and asynchronous serial RS232 or TTL (using a soldered jumper) output. All interfaces work without user code or complicated setup strings.

The Power Requirements

The HRLV‑MaxSonar‑EZ functions throughout a 2.5V to 5.5V operational voltage range.  This allows for easy integration from 2.5V to 5.5V and means that users of low voltage microcontrollers, or those who wish to operate in solar or battery based systems do not have to provide an extra power supply for the sensor.

The HRLV‑MaxSonar‑EZ sensors have a 3.1mA average current draw during free ranging operation.

The Controlled Beam Shape

Similar ultrasonic products may have frequent side lobe detection and can even falsely trigger on objects behind or to the sides of the sensor. The HRLV‑MaxSonar‑EZ offers a controlled beam that is designed to reject small objects (clutter) outside of the central beam area and provides long range sensitivity without detecting frivolous or unwanted targets.

Users are encouraged to pick the product with the sensitivity that best matches their application.  In the HRLV‑MaxSonar‑EZ product line the product with the widest beam is the MB1003. The product with the narrowest beam is the MB1043.

The Calibration

Each HRLV‑MaxSonar‑EZ is tested for proper operation at our facility and comes with a factory calibrated beam pattern to help ensure consistent operation of the sensor even from part to part.

The HRLV‑MaxSonar‑EZ automatically calibrates to its environment before every range reading. This calibration includes voltage, humidity, acoustic noise, electrical noise conditions, and compensation for temperature.

Product Documents

MB1003 Datasheet HRLV-MaxSonar-EZ0-datasheet
MB1013 Datasheet HRLV-MaxSonar-EZ1-datasheet
MB1023 Datasheet HRLV-MaxSonar-EZ2-datasheet
MB1033 Datasheet HRLV-MaxSonar-EZ3-datasheet
MB1043 Datasheet HRLV-MaxSonar-EZ4-datasheet
Application Notes
Sensor Selection GuideSensor Selection Guide
RoHS ConformityRoHS Declaration of Conformity
CE Declaration of ConformityCE Declaration of Conformity
Reliability DemonstrationMTBF Report
Quick Start GuideMaxSonar Quick Start Guide
High Resolution PicturesHigh Resolution
Product 3D Models
Key ShotIGES FileACIS 7.0 FileSolid Works Part
STL FileSTEP FileParaSolid Part 
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Design Cycle Welcome to the review of the Design Cycle Guide. This article provides the summary of each of the phases with links to the respective articles for more detailed information. Click here for full article.
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Acoustic Types All targets reflect sound to a varying degree. Ultrasonic sensors use the speed of sound to calculate distance based on the time it takes for an echo to return from a target. More simply put, our sensors detect distance much like a bat or dolphin does. Click here for full article.
Author: Nicole Smith  Date: 08-17-2015
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