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(Hopefully) simple reed switch question

Discussion in 'General Electronics Discussion' started by xxJaRxx, Jun 2, 2013.

  1. xxJaRxx

    xxJaRxx

    34
    0
    Oct 16, 2011
    Hi guys,

    I am looking at using a reed switch for a project I am working on at the moment and I have a couple of questions..

    I will be using the reed switch as a simple indicator as to whether an object has moved or not. The idea is that the switch itself will be mounted to an object that doesn't move and connected to a microcontroller, the magnet will be mounted to the object that does move, when the object moves away, the reed switch 'trips' and the microcontroller sounds a buzzer.

    The reed switch I am looking at is this one:
    http://www.rapidonline.com/Electronic-Components/Brass-proximity-switch-62088

    My main question is regarding the 'Switching distance: 10mm min'. What exactly does this mean, the magnet has to be within 10mm to close the contacts or more than 10mm?!

    Also is there anything else I need to know about reed switches? I haven't worked with them before.

    Cheers for any advice
    James
     
  2. davenn

    davenn Moderator

    13,323
    1,769
    Sep 5, 2009
    hi there

    has to be within 10 mm to close the contacts

    cheers
    Dave
     
  3. xxJaRxx

    xxJaRxx

    34
    0
    Oct 16, 2011
    Cheers Dave! Is that a fairly normal switching distance for a cheap-ish reed switch and magnet? It seems to be very short.

    Can I use any magnet to close the contacts of a reed switch? E.g. could I go out and buy a really strong magnet and use it to increase the switching distance without any issues?

    Cheers
    James
     
  4. davenn

    davenn Moderator

    13,323
    1,769
    Sep 5, 2009
    yes thats a typical distance
    a stronger magnet magnet may give you a few more mm
     
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