Require Assistance with a magnetisom sensing project

Discussion in 'The Projects Forum' started by Corey Dwyer, Jun 13, 2016.

  1. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Good Evening, i need assistance with a hobbyist project of mine:

    I need to make a device that is relatively small and detects a magnetic field/ polarity: and once detected it then makes a vibration, and if at all further possible 1 vibration would signify 1 pole and 2 vibrations would signify the other pole.thus meaning that holding the device over a magnet would signify its position and which way up it is. Where do i start going about making this device? i.e. components to use circuits etc. Should i use PIC to programme a chip to do this for me? The only thing i have found throughout my research is a hall sensor for the magnetic field detection. Many Thanks in advance
     
    Last edited: Jun 13, 2016
  2. #12

    Expert

    Nov 30, 2010
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    It's called a Hall Effect sensor.
    Sure. Let the microprocessor guys do this one. You can get a lot more features with a PIC while an analog circuit keeps getting bigger and bigger as you add more and more features.
     
  3. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Many thanks sir; so what would i need for the sensor to vibrate upon certain polarities, imagine i need to see which way up a magnet is in an opaque object so i cant see it and the device i want to make senses which object it is in (out of multiple objects) and which way up it is
     
  4. ISB123

    Well-Known Member

    May 21, 2014
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    Do you have any programming experience?
     
  5. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Only Web programming i did a bit of PIC in school when i was like 14 haha, but that is now 5 years ago, is this going to be as complicated as youre making it sound haha
     
  6. ISB123

    Well-Known Member

    May 21, 2014
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    Nope, should be quite simple not much more complicated than blinking a LED. If you want I'll do the circuit schematics tomorrow since this is fairly interesting and not very time consuming.
     
    Corey Dwyer likes this.
  7. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    That would be absolutely incredible sir, many thanks
     
  8. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Why not just use another polarized magnet?
    It will either be pulled towards or pushed away..
     
  9. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    I'll give a context for this haha: I'm a magician and the device in question is to sense in which spectators hand a magnetic coin is in and whether it is heads or tails side up, so it has to be small, discrete and give a vibration so it is silent and should be able to hide strapped to my wrist, thus not another magnet as it wouldn't give me the sense i need to detect the coin. Many thanks
     
  10. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    You will need to get the SENSOR part of your device within 1 inch or maybe 2 at most, of the magnet (2-5 mm)

    Hide it in the end of your sleeve near your wrist?
     
  11. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Yeah certainly that was the plan
     
  12. Sensacell

    Well-Known Member

    Jun 19, 2012
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    Oh that's fiendishly clever...

    That's why I hate magic shows- I get so frustrated trying to figure things out!
     
  13. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Haha, it is an existing product in the market but this is for personal use, yes it is fiendishly clever but fiendishly priced too haha
     
  14. ISB123

    Well-Known Member

    May 21, 2014
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    Done, if you need help programming it just ask.
    proto1.png
     
  15. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Thats absolutely Incredible, and yes i would most certainly need assistance with the programming, i cant figure out how to start a private conversation on here to make things easier. Once again many many thanks.
     
  16. Corey Dwyer

    Thread Starter New Member

    Jun 13, 2016
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    Do you know roughly the cost for the equipment in this circuit and where to begin buying these? Hahaha
     
  17. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    What? Its not magic?... Son of a b...
    Whats next.. Please don't tell me Santa isn't real.. :p

    I do a "similar" trick.. But I look away and have them hold the hand with the coin in it against their forehead for about 20 seconds and tell them to "think" really hard about it..
    Then I have them turn around and face me and then hold both hands out in front of them and I can guess which hand the coin is in EVERY time...
    Anyone want to guess how that trick is possible?
     
    Dr.killjoy likes this.
  18. ISB123

    Well-Known Member

    May 21, 2014
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    Total cost of the circuit should be under 5$. USBasp programmer costs 2$ on eBay. You would need to tell me from which country are you? If from UK you can buy components from Farnell. You could try eBay but shipping takes forever.
    You would need to get vibration motor so not a standard dc motor.
     
    Last edited: Jun 14, 2016
  19. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    Someone has been watching the Illusionist to much and also check out The Prestige too..
     
  20. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Both good movies..
     
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