Ultrasonic sensing is one of the best ways to sense proximity and detect levels with high reliability.

It emits an ultrasound at 40 000 Hz which travels through the air and if there is an object or obstacle on its path It will bounce back to the module. Considering the travel time and the speed of the sound you can calculate the distance.

how ultrasonic sensors work

An ultrasonic sensor is an instrument that measures the distance to an object using ultrasonic sound waves.

An ultrasonic sensor uses a transducer to send and receive ultrasonic pulses that relay back information about an object’s proximity.  

High-frequency sound waves reflect from boundaries to produce distinct echo patterns.

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applications

Ultrasonic Distance Measuring

Distance measurement is based on the measurement of time-of-flight.  The time between sending and receiving the reflected sound signal is calculated by the sensor.  Ultrasonic distance sensors, like the MB7360 HRXL-MaxSonar-WR, are used as height monitors, in bin level measurement and proximity zone detection applications.   

  • As an example.
    • Ex. Distance measurement would be applied in a garage parking application, sensing when a vehicle is pulled completely into a garage.
    • The MB7360 has been used as a bin level sensor to detect the presence or absence of grain and other materials in bins.

Specs of MB7360

Product Specifications

  • Resolution of 1-mm
  • 7.5Hz read rate
  • Internal temperature compensation
  • 42kHz ultrasonic sensor measures distance to objects
  • RoHS Compliant
  • Read from all 3 sensor outputs: Analog Voltage, Serial, Pulse Width
  • Virtually no sensor dead zone, objects closer than 30cm typically range as 30cm
  • Operates from 2.7-5.5V
  • Low 2.9mA average current requirement
  • Small, light weight module
  • Designed for easy integration into your project or product
  • Operational temperature -40°C to +65°C (-40°F to +149°F)
  • Real-time automatic calibration (voltage, humidity, and ambient noise)
  • Firmware filtering for excellent noise tolerance and clutter rejection
  • Weather resistant (IP67), optional chemical resistant F-Option
  • Matches standard electrical 3/4-inch PVC pipe fittings for easy mounting (3/4-inch National Pipe Thread Straight)
  • Long, narrow detection zone
  • RS232 Serial Output

Ultrasonic Level Sensors

    • Tank level measurement, Fuel gauging, irrigation control.
    • This project for a Low Power Water Level Sensor, from Hackster.io developer Amedee,  uses a weather resistant sensor from our WR line.  In combination with a LoraWan node and The Things IoT open source network, this project was developed to measure the water level in a rainwater tank.  Although, it can be used in many applications. 

Ultrasonic Obstacle Detection

    • Our UAV Sensors for Drones as well as our proximity sensors that are used for robots are for obstacle detection.
    • Ultrasonic sensors are suitable for close range detection up to ten meters and provide multiple range measurements per second.
    • Main advantages:
      • Low power consumption – can be powered by battery, inexpensively.
      • Can operate in many environmental conditions – ultrasonic sensors work in smoke filled environments, where other sensors would fail.

newping library

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How the sketch works

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