SLYA076 july   2023 TMAG5273

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Liquid Level Sensing Implementations
    1. 2.1 Capacitive
    2. 2.2 Ultrasonic
    3. 2.3 Magnetic Hall-Effect Implementations
      1. 2.3.1 Different Types of Hall-Effect Sensors
      2. 2.3.2 Implementation Option 1: Floating Magnet with Linear Hall
      3. 2.3.3 Implementation Option 2: Floating Magnet with Array of Latches or Switches
      4. 2.3.4 Flotation Device on Axial Arm
  6. 3Functional Demo Design
    1. 3.1 Float Arm
    2. 3.2 GUI Operation
    3. 3.3 3D Printing Part Orientations and Settings
  7. 4Summary
  8. 5References
    1. 5.1 Device Support
    2. 5.2 Related Documentation

4 Summary

Using Hall-effect sensors to measure the level of a liquid in a container can be done in a variety of ways. An array of Hall-effect latches or switches can measure the magnetic field of a floating magnet. A Hall-effect switch can measure the field of a magnet head-on as the magnet floats up and down. A 3D linear Hall-effect sensor can measure the rotation of a magnet attached to a floating arm. The 3D linear Hall-effect implementation with a floating arm provides a stable and accurate reading with a small required magnet size. The measuring capability of the design can be varied as needed by designing a different shaped float arm or using a different magnet or sensor.