Simple vibration activated 3mm LED light.

Discussion in 'The Projects Forum' started by noyil, Sep 2, 2015.

  1. noyil

    Thread Starter New Member

    Sep 2, 2015
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    I'm trying to build something pretty similar. but with 3mm LEDs.
    should I use a different capacitor/resistor?

    I actually didn't understand what components were used in the final solution for this motion-activated LED system.



    Mods Edit :
    Please don't hijack the thread from other members.
    This thread was split from Simple vibration activated LED light - Capacitor?
     
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    To restate the problem:

    A battery-powered LED comes on when something starts vibrating, stays on for 30 seconds after the vibration stops, then sits consuming zero power until the vibration starts again. Is that it?

    ak
     
  3. noyil

    Thread Starter New Member

    Sep 2, 2015
    7
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    I already have 3mm LEDs, CR2032 batteries, and SW18010P vibration switches.
    When i move or knock on the vibration switch, the LED almost won't turn on (because the switch is active for only 1ms).

    I just want the LED to turn on easily when the system is moving and after some time turn off, so I think making it light up for X seconds after the sensor was activated is a simple solution.

    There is a similar product for bicycle wheels which turns a LED on when the wheel is spinning, but I need to build a smaller and lighter system:
    http://www.dx.com/p/motion-activate...-for-bikes-and-cars-2-pack-23041#.VecEE_mqpuA
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Might try a C555 oneshot to stretch on pulse.
     
  5. ScottWang

    Moderator

    Aug 23, 2012
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    Could you draw a block diagram, it's more easy to discuss, or you just want to do as Bernard suggested.
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Might go back to original post & try the BS170 or other logic level FET solution. The C 555 draws a small current in standby, FET does not
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Using BS170 ckt. no changes needed for 3 mm LED. Found a wm white surface mt. LED that operates with 2.8 V & is reasonably bright directly connected to CR2032. Phillips LXH8-PW30, 3W, 700 mA, SN: G19657A, Electronic Goldmine.
     
  8. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    The BS170 is not rated as LL, but starts conduction @ 3V ,full on @ 3.4.
    A true LL in TO92 pkg. is ZVNL120A, 200V, 180mA, 1.7V gate start, 2.7 V full on @ .4 V D-S.
    Red LED might be best choice for reliable operation.
     
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