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Re: Lawn sprinkler alarm

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  • Tony Mikolaj
    ... Or you could use the mouse to detect lines (tape) marked on the hose which would also tell you if it had come off the rails Tony
    Message 1 of 9 , Apr 21, 2013
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      --- In Electronics_101@yahoogroups.com, Jong Kung <jongkung01@...> wrote:
      >
      >
      > Optical mouse technology seems kind of high tech. I don't think optical mouse works for uneven (grass) surface. The magnet + hall sensor technology is proven in car abs system. And they work even with dirt, etc..
      >

      Or you could use the mouse to detect lines (tape) marked on the hose which would also tell you if it had "come off the rails"

      Tony
    • normnet2003
      I have settled on a hall sensor and magnets on the front wheel after determining how to mount and keep water tight. Thanks all for the insight. Norm
      Message 2 of 9 , Apr 21, 2013
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        I have settled on a hall sensor and magnets on the front wheel after determining how to mount and keep water tight.

        Thanks all for the insight.


        Norm

        --- In Electronics_101@yahoogroups.com, "normnet2003" <normnet2@...> wrote:
        >
        > I have been using a self moving lawn sprinkler however when it pulls 50' of water filled hose it can easily loose traction if it's wheels are on a root, cement, stone or even bare un-rooted ground.
        > http://ecx.images-amazon.com/images/I/31l8ZEKFQwL._SY300_.jpg
        >
        > I have built the notification part of the alarm by use of a walkie talkie and now need a way to detect the loss of forward movement.
        >
        > I am trying a MMA7361 accelerometer but I don't think it can reliably detect movement due to it's slow pace.
        > http://www.freescale.com/files/sensors/doc/data_sheet/MMA7361L.pdf
        >
        > What type of sensor would detect roughly a 1 foot movement over a 2-3 minute period?
        > Is their a dead reckoning type of sensor?
        >
        > Norm
        >
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