weight placed alaram

Discussion in 'The Projects Forum' started by jswathi, Dec 29, 2012.

  1. jswathi

    Thread Starter New Member

    Dec 29, 2012
    1
    0
    can any one plz help me in searching the circuit which has the following reqirement
    A circuit such that if the gun is taken off from a specific position, your device must notify with an alarm must ring
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    An accelerometer might work. You need to provide more details about what you need. Is it barrel direction, trigger position, safety status, etc?
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,850
    767
    Weight detector → Voltage comparator + Vref → Transistor → Relay → Alarm device

    Weight(or position) detector is made from:
    Wood, or board, or woodboard, Spring, Potentiometer(VR), reference voltage Vref.

    When the gun is put on the woodboard, because the VR is set under the woodboard, so the VR will moving down to the lower position, the position is a low voltage as Vin, when the comparator compare with Vref, then the comparator will output a Low signal, the transistor doesn't work, and the relay will be off.

    When the gun is took away from the woodboard, the VR will moving up to the higher position, the position is a higher voltage as Vin, when the comparator compare with Vref, then the comparator will output a high signal, the transistor will going to work, and the relay will work too, and the alarm will be actived.

    It just an idea, you may modify to suit your need, as the woodboard can be a special box, and the whole detector put into the box.
     
  4. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    How about a board, a spring, and a microswitch?
    "Taken off from a specific position" isn't easy to understand.
    How far off?
     
  5. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,127
    266
    Capacitive proximity sensor?
     
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