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Rotation detection sensor with schematics

Discussion in 'Robotics & Mechatronics' started by selva prabhu, Aug 25, 2015.

  1. selva prabhu

    selva prabhu New Member

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    Hi All,
    I need to know the mechanical sensor or other sensor which can detect the rotation of chain.
    When the rotation of chain stopped it should trigger alarm using 24v buzzer.
    Kindly help me to over come this circuit.
     
  2. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    Presumably the chain runs over sprockets. One relatively common method is to use a Hall sensor mounted across the sprocket teeth to detect movement. You can also put a magnet anywhere else on the sprocket or shaft and detect its rotation. Similar applications have been used in cars for many years now. Check out ABS braking system. They are also used in small gasoline engines (e.g., model airplane engines) to control timing. There is lots of information about both applications on the Internet.

    John
     
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  3. MaxHeadRoom78

    MaxHeadRoom78 Active Member

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    There are also hall effect sensors that do not require magnets but detect gear teeth, as used in automobiles now for timing.
    But smaller ones are available
    Max.
     
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  4. dave

    Dave New Member

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  5. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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    The general circuit is a "missing pulse detector" or "frequency switch". See this http://www.mtl-inst.com/images/uploads/datasheets/8000/io_modules/22/8123.pdf for a commercial module that does a lot more.

    The sensor isn't a hall effect sensor, but rater a variable reluctance sensor. https://en.wikipedia.org/wiki/Variable_reluctance_sensor
     
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  6. gophert

    gophert Active Member

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    Various motor encoders are available - you can attach one to the drive shaft, the driven shaft or add an idler shaft. Various designs of motor encoders but all essentially put out a pulse or quadrature pulse (allows detection of forward or reverse direction).
     
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