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Hall effect sensor - 480-5198-ND - Question

  1. Oct 25, 2015 #1
    1. The problem statement, all variables and given/known data
    I am using the a hall effect sensor - model 480-5198-ND. I have tested this simple circuit using a LED and it is working. However, it is "ON" by default. Only when the magnet is near the hall effect sensor , it will be "OFF".

    How do I make it such that it is OFF by default and ON only when the magnet is near the hall effect sensor?

    2. Relevant equations


    3. The attempt at a solution
    http://[ATTACH=full]199957[/ATTACH]
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Oct 25, 2015 #2
    The A in my diagram means that it is connected to the LED.
     
  4. Oct 25, 2015 #3

    berkeman

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    Staff: Mentor

    Follow it with a common-emitter NPN transistor stage to invert the output signal. Does that make sense?
     
  5. Oct 25, 2015 #4
    Can I have some explanation why it is able to invert the signal?
     
  6. Oct 26, 2015 #5

    berkeman

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    Staff: Mentor

  7. Oct 26, 2015 #6
    May I know how do I calculate the value of R1 and R2?
     
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