Hall-effect Switches and pic Inputs


Closed Thread
Results 1 to 5 of 5
  1. #1
    Join Date
    May 2012
    Location
    Merseyside, UK
    Posts
    237

    Default Hall-effect Switches and pic Inputs

    Hi...

    Has any body had experience in using hall-effect switches with Pics.

    Are there any design considerations it would be good to be aware off.... I know most switches have Hyst. circuits built in (Allegro A1104) but are there any other rules.

    Both hardware and Software advice thank you.

    Thanks for reading

    Andy

  2. #2
    Join Date
    Mar 2003
    Location
    Commerce Michigan USA
    Posts
    1,166


    Did you find this post helpful? Yes | No

    Default Re: Hall-effect Switches and pic Inputs

    I try to use only open collector to ground output devices with an on board pullup resistor so as not to chance injecting any high voltage spikes on any pins. Hall Efect Switches are much better than mechanical ones as there is no contact bounce. Watch for the ones that source or have PNP outputs as the source of there voltage is the source of there supply. If placed a resonable distance from the PIC input pin lines become great antennas. Most all of my designs however use opto isolators for digital input to elimnate these problems. Even with Hall Efect Switches.
    Dave Purola,
    N8NTA
    EN82fn

  3. #3
    Join Date
    May 2013
    Location
    australia
    Posts
    2,379


    Did you find this post helpful? Yes | No

    Default Re: Hall-effect Switches and pic Inputs

    the a1104 is a unipole device
    where the TLE 4913 is omnipole
    if N/S pole detection is wanted

    as dave said open collector/drain is the go
    Last edited by richard; - 2nd October 2014 at 13:42.

  4. #4
    Join Date
    May 2013
    Location
    australia
    Posts
    2,379


    Did you find this post helpful? Yes | No

    Default Re: Hall-effect Switches and pic Inputs

    there is always the ubiquitous UGN3503LT if you want to read analogue mag field strengths too

  5. #5
    Join Date
    May 2012
    Location
    Merseyside, UK
    Posts
    237


    Did you find this post helpful? Yes | No

    Default Re: Hall-effect Switches and pic Inputs

    Just ordered a free bunch from Allegro

    Will let you know how I get on.

    Thank you for advice....Open Drain Mosfets !!!

Similar Threads

  1. Hall Effect flow meter with 16F876
    By revelator in forum mel PIC BASIC Pro
    Replies: 2
    Last Post: - 10th March 2010, 21:42
  2. Replacing Hall Effect throttle with PIC
    By idtat in forum General
    Replies: 4
    Last Post: - 22nd October 2009, 22:55
  3. Hall effect reading
    By ewandeur in forum mel PIC BASIC Pro
    Replies: 1
    Last Post: - 26th November 2008, 16:49
  4. Controlling switches with a PIC
    By TonyA in forum mel PIC BASIC Pro
    Replies: 10
    Last Post: - 4th March 2008, 23:44
  5. hall effect
    By dragons_fire in forum mel PIC BASIC Pro
    Replies: 3
    Last Post: - 10th April 2007, 16:49

Members who have read this thread : 1

You do not have permission to view the list of names.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts