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Description: These easy-to-use ultrasonic rangefinders from Maxbotix work the same way as the EZ line that you know and love, but this new high-resolution series features 1 millimeter resolution! As with the rest of the Maxbotix range finders, these sensors feature Analog Voltage, RS232 Serial, and Pulse Width outputs making them easy to interface with any microcontroller. These sensors have a maximum range of 5000 mm (195 inches) with virtually no dead zone (although objects closer than 30 cm will typically range as 30 cm).

We’re offering the EZ0, EZ1, and EZ4 with progressively narrower beam angles allowing the sensor to match the application. Please see beam width explanation below.

Control up to 10 sensors with only two pins! Checkout the Maxbotix FAQ listed below.


  • 42kHz Ultrasonic sensor
  • Operates from 2.5-5.5V
  • Low 3.1mA average current requirement
  • 10Hz reading rate
  • Analog Voltage, RS232 or TTL Serial, and Pulse Width
  • Small, light weight module


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Customer Comments

  • Jim, I enjoyed the Ultrasonic Sensors video and the seeing the sample project.
    You mentioned that you sell the ultrasonic transducers by themselves but I can’t find them on the spark fun site. Should I search for something other than “ultrasonic”? Thanks

  • I have a project where I need to measure the foam level in a tube ~ 6 cm wide. 1. Would this sensor be able to detect the foam surface, or would it only sense the liquid surface? What if i float a pingpong ball on top of the foam? 2. Would the sides of the tube interfere? I’d be working pretty much in the minimum range i think. Any other product that woud be better for this application? Thanks, Svend.

  • I’ve been wanting to put one of these in a 3.75" tube to measure the level of a cistern… but I get readings from the side of the tube (it’s about 2 yards long before you get to the actual tank). Even though the beam looks like it can handle that but I’m not sure if I’m missing anything….?

    Also, I’m going to try this if no one has experience, but would putting the sensor in water kill it? (just the black round sensor part… not the breadboard part). It wouldn’t be completely underwater, more just splashed while they’re filling the cistern.

  • Member #101637

    Hello, this is Scott from MaxBotix Inc. I’m glad to support you. All MaxBotix Inc., employees are legally required to clarify their name and affiliation with MaxBotix Inc., in forum posts.

    To answer the post…

    From the datasheet: Filtered Operation - Free-Run The HRLV-MaxSonar-EZ uses an internal 2Hz bandwidth filter to process range data; which reports the latest range every 100mS or 10Hz. This improves the sensor’s performance for accuracy, noise rejection, and reading to reading stability. The filtering in the free-run operation also permits additional acoustic and electrical noise tolerance

    You should use triggered operation (Pin 4) to receive the fastest update rate. This will remove some of the advanced filtering so the 1mm resolution may not be as accurate or stable.

    Best regards,

    Scott Wielenberg Technical Support & Sales of MaxBotix Inc. Phone: (218) 454-0766 Fax: (218) 454-0768 Email: Web: Follow us on Facebook at:

    Technical support and sales are subject to the terms and conditions listed on our website at MaxBotix, MaxSonar,EZ0, EZ1, EZ2, EZ3, EZ4, AE0, AE1, AE2, AE3, AE4, WR1, WRA1, and WRLA1 are trademarks of MaxBotix Inc.

  • Do these things have a substantial lag in response time? I just purchase one of these and I jave a delay of between 0.5 and 1 second! I used the older Maxbotix sonars in the past with almost no lag time. Did I get a lemon?

    • Hi,There should not be a significant lag time. I was going to suggest that you contact us at however, it appears that we already have a message from you. We will be happy to help you determine if this is a problem product, or if possibly something can be corrected in your setup that may correct this issue. Thanks, Tim

  • Well somehow I blew mine up, soooo…….

  • While the range measurement feature will not work for less than ~30cm as stated, the sensor will still detect down to ~1mm, as explained in the datasheet. If you just need to know if something is right in front of you, you can get down to 1mm, but you won’t know exactly how far it is (just less than 30cm).

  • with virtually no dead zone (although objects closer than 30 cm will typically range as 30 cm).

    That is the definition of a dead zone.

    • Hmm, somewhat subjective… It’s definitely an innacurate reading, but the object is still detected by the sensor. However, to me a “dead zone” would mean a region where the sensor doesn’t detect an object at all (much like a cellular dead zone is a place a phone can’t get a reliable signal).

      • I am thinking of it as a “KEEP OUT” zone. Try to design your system to either physically or logically not consider data from within that zone.

Customer Reviews

5 out of 5

Based on 2 ratings:

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Great product.

Son used this range finder to build his Sr. project for high school. Very interesting project to help new trombone players learn slide positions. It was accurate and did the job very well.

Works Fine!

pulse width is 10us/cm