Frequently Asked Questions (FAQ)

Frequently Asked Questions about Ultrasonic Sensors


Advantages of Ultrasonics

Main advantages of using ultrasonic sensors vs. others include.

  • High Frequency, high sensitivity and high penetrating power, it can easily detect external or deep objects.
  • These sensors easily interface with microcontrollers or any type of controller.
  • Ultrasonic sensors are easy to use and not dangerous during operation to nearby objects, people or equipment.
  • Not affected by dust, dirt, or high-moisture environments.

*Our SCXL‑MaxSonar‑WR Product line is self-cleaning.  Which allows for continuous running and less downtime.


I have a specific problem I need to be solved, how do I choose the right sensor for the project?

Currently, we have 20 different product lines that are broken up into 2 applications, Protected (Indoor environments) and Unprotected (outdoor environments).


We have developed sensors for particular applications, such as:


While we have 20 different lines, there are many variations we have to suit your use.

Along with a variant of housing options, we also offer options for protection.

We offer the F-Option, which is our IP68 rated Fluorosilicone sealant for Outdoor use.  It offers additional protection in hazardous chemical environments, like corrosive gases or liquids.  

We also offer the P-option, which is a Parylene coating we apply to the surface of the aluminum transducer.  It helps improve the corrosion resistance of the aluminum transducer.

Contact Technical Support for more information and support with sensor selection.


What type of targets do MaxBotix Ultrasonic Sensors detect?

Ultrasonic sensors detect solids, liquids, or powders.  

Our sensors are used to detect surfaces whether they are wet, dry, dirty, clean, rough or smooth.  

Light, fog, dirt or dust have no impact on our ultrasonic sensors ability to sense.     

The ideal surface to detect with our sensors is hard, smooth and non-porous.


How do I know what the measured distance is?

The transducer vibrates at the 42kHz, transmitting the ultrasonic wave, This wave will bounce off of the sensor’s target and return to the transducer. At this point, the return wave will vibrate the transducer as well, generating a voltage which will be converted into a distance measurement via the sensor firmware/programming.


How do you mount the ultrasonic sensors?

Mounting your ultrasonic sensor for your project depends on your application.

We’ve detailed the mounting of a sensor in a pipe, here.

When considering mounting a sensor in a tank for liquid or grain level sensing, read this article here, about Tank Level Monitoring for more information.

If you’re mounting a Snow Sensor, review our notes on Snow Sensor Mounting.

Our technical support has assisted many engineers in their mounting configurations.


If our published resources don’t provide an answer, email us at  [email protected] to allow us to help you figure out a solution.


Interfacing our Ultrasonic sensors with Controllers?

We’ve written quite a bit about interfacing our sensors with an Arduino or Raspberry Pi.

Those resources can be found here:


Arduino Resources

  1. Using an Arduino with an I2C-MaxSonar
  2. How to Use an Ultrasonic Sensor with an Arduino

Raspberry Pi Resources

  1. Interface Raspberry Pi with an ultrasonic sensor to read serial data
  2. Interface Raspberry Pi with an ultrasonic sensor to read serial data pt. 2
  3. Connect a Raspberry Pi Zero with an USB Ultrasonic Sensor
  4. Setting up the Raspberry Pi Zero for an I2C Sensor


Pixhawk Resources

While we haven’t worked with a Pixhawk inhouse, we’ve compiled this short list of resources used by creators to interface our sensors with a Pixhawk.

Interfacing Ultrasonic Sensors with a Pixhawk or Ardupilot Mega (APM)


What else are you interfacing our rangefinders with?  Contact us today with any feedback or see how we can help.


How do you read our MaxSonar Beam Patterns?

We provide beam patterns for all of our ultrasonic sensors to assist you to choose the right sensor for your application, target size, and distance.  


We’ve provided this resource to help you find the right sensor for your application based on beam pattern:

Reading Maxsonar Beam Patterns


Can I switch the beam pattern of a sensor model after ordering it or should I order a specific beam pattern for each?

You would need to select a sensor with a beam pattern that fits your application needs. The beam pattern of the sensor cannot be changed and would be specific to each sensor.  To understand how to read our beam patterns, reference our “Reading MaxSonar Beam Patterns” Tutorial.


What aren’t these sensors used for?

  • Safety-critical applications (such as life support) or other applications where a failure of the product could cause a severe personal injury or death.

Sidenote: a popular use of our product is for canes for the blind.  Unfortunately, we do not support such applications because many sensors do not include the self-checking redundant circuitry needed for such use.

  • Aerospace applications or environments.
  • Mounted on or in automobiles snowmobiles, boats, aircraft or other motorized vehicles (land, water or air based) regardless of whether they require registration with a government entity.


I don’t see the particular sensor I need on the site,  what is the process for acquiring a custom sensor?

We do offer custom engineering services to customize any of our existing sensors in our product line to meet any requirements of a specific project, solution or product development. We offer a wide range of customization services including custom firmware, hardware or aesthetic modification to accommodate individualized solutions.


What would be the price range for a custom application that would fit our needs?

This will depend on your specific application needs and would be determined by our Sales and Engineering teams after an in-depth discussion with you. If your range and power requirements are flexible, we may have a sensor that would work in your application off the shelf.


What are the advantages of working with MaxBotix Inc. over competitors?



From – MaxBotix Inc


frequently asked questions about ultrasonic sensors
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frequently asked questions about ultrasonic sensors
Ultrasonic sensors are a low cost, reliable solution for distance ranging. There are often questions when it comes to interfacing our sensors. This faq has been developed as a resource to guide you in building your project.
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MaxBotix Inc.
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