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Is it possible to buy or create a very sensitive reed switch?

Discussion in 'General Electronics Discussion' started by vilainoiseau, Nov 5, 2012.

  1. vilainoiseau

    vilainoiseau

    2
    0
    Nov 5, 2012
    I want to create senors that turn some LED's on(or off) when a small magnet comes close (2-6 inches). I want to create these sensors for a laser tag like game only with Nerf Vortex disk guns with a small magnet embedded in the disk. The magnet would probably have to weigh no more than a penny.
    Thanks.
     
  2. galaxy

    galaxy

    28
    2
    Nov 3, 2012
    I think you may find that a reed switch won't be suitable, would have to be a big magnetic field and they are relatively slow to re-act.. A Hall effect device may be better, but the range is still a problem,

    What about RFID tags. They can be passive, and are small and lightweight, way less than a penny (I am in Australia and we don't have penny's, but I think I get the idea).

    Some of the RFID systems can have quite large detection ranges. Think security tags in stores and RFID detection of rail cars etc.
     
  3. vilainoiseau

    vilainoiseau

    2
    0
    Nov 5, 2012
    Thanks Galaxy, that sounds like it will be a good option. There are some small and cheap RFID tags on ebay. I just need to find some relatively cheap RFID sensors (around $10 USD if possible) that can be used to switch the LED's lights on or off.
     
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