SLYA058 June   2022 DRV5021 , DRV5032 , DRV5033 , TMAG5123 , TMAG5124 , TMAG5170 , TMAG5273 , TMAG5328

 

  1.   Abstract
  2.   Trademarks
  3. 1Hall-Effect Sensors in Smart Locks
    1. 1.1 Tamper Detection
  4. 2Methods for Hall-Effect Based Rotational Position Sensing
    1. 2.1 Switch Implementation
    2. 2.2 Rotational Sensing With 3D Hall-Effect Sensors
  5. 3Summary
  6. 4References

2 Methods for Hall-Effect Based Rotational Position Sensing

There are different ways of implementing position sensing in an electronic smart lock depending on the amount of resolution desired. Switched implementations can be used to give an absolute position of the deadbolt being completely open, completely closed, or somewhere in the middle depending on the position of the switch in the layout. Depending on how many states are desired, a varying number of switches can be used. Another method is to have a Hall sensor measure the angle of rotation for the motor or center shaft of the lock. Lastly, the motor itself can have encoding on it. Hall-effect sensors can be used to implement motor encoding as well. For more information on Hall sensor motor encoding, see the Incremental Rotary Encoders application brief.