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Need design for motion sensor battery operated LED light.

Discussion in 'Electronic Design' started by [email protected], Sep 24, 2012.

  1. Guest

    Anyone have a design for a motion sensor? Sure, I could just buy the
    sensor for an outdoor motion sensor light, but I want a circuit to
    control a *battery operated* LED light. The purpose is to illuminate
    the inside of an outhouse (toilet) at a campground, and have it turn ON
    when someone enters. There is no electricity in the building. I just
    want something battery operated that wont be switched on by the campers
    and left turned on to drain the batteries when they leave the outhouse.
    It should illuminate when they enter, and turn off shortly after they
    leave.

    I'm thinking in terms of those stick on LED lights sold for closets and
    stuff, except I want it motion sensored.

    Or, is there already a device made that does this?
    (Something with a solar cell charger, and rechargable batteries would be
    even better, but the solar charger would need to be outside the
    building).

    The other idea is to buy a ready made circuit board and install it in my
    own light..... Do they sell such a thing? I'd rather not have to build
    the board if possible, but I'm open to options!
     
  2. Sjouke Burry

    Sjouke Burry Guest

    Microswitch under the floorboards and/(or both) the seat-area,
    uses no energy, and shuts down immediately.
    Your motiondetector will be a continious drain on the battery.
     
  3. Guest

    This product exists

    http://www.aliexpress.com/item/Free...-Auto-Keyhole-Sensor-Led-Light/612788589.html

    I'm sure that's not the only way to get it.
     
  4. Guest

    Thank for both replies. The switch under the floor is an interesting
    idea, but I'd probably have to do some major changes to the floor, or
    have a double floor. All of that seems like too much work. The switch
    under the toilet seat is an excellent idea in a women's outhouse, but
    wont work for the men who use the urinal.

    This leaves the door switch. I like that, but how do I make it shut off
    after _x_ minutes?

    I did do some googling and found that there are both solar powered and
    motion sensing battery lights. I had tried that earlier using other
    search words and got nothing. I like this one the best so far.....
    http://www.newegg.com/Product/Product.aspx?Item=N82E16882021177
    Seems simple, will recharge with solar panel, and is not real costly.
    I'd think that the solar panel will offset any drain from the motion
    sensing circuitry.

    How can a lithium battery really run a LED for years? I have used some
    of those small cheap teacup LED candles that flicker and look like a
    real candle. They are only one LED, and run on a CR2032 lithium
    battery. After leaving them on overnight for several days, the battery
    is dead.
     
  5. Guest

    http://www.walmart.com/ip/Good-Choice-LED-Egg-Shaped-Motion-Sensor-Night-Light/17279128

    Also Lowes and HomeDepot carry similar, in same price range, more or less, name brand stuff like Sylvania.
     
  6. Jasen Betts

    Jasen Betts Guest

    put a microswith where the door lock will activate it, or install one
    of those slow momentary button switches.
     
  7. mike

    mike Guest

  8. Anna Joshi

    Anna Joshi Guest

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  9. Guest

    Use a battery with low internal resistance and a supercap. There are
    lots of bicycle dynamo-powed lights that use a supercap for a few
    minutes of illumination; maybe you could dump enough into the cap during
    the time the door is open.
     
  10. That was my suggestion. keep it simple.

    Most campers will have a flash light and won't need the led.

    George H.
     
  11. Charlie E.

    Charlie E. Guest

    Hmmm.. Maybe a door mounted light, with either a microswitch to detect
    it opening, or just a little ball bearing thing to detect the motion
    to trigger a little 555 timer thing. Door opens, it stays lit for
    five minutes. It it goes out, you kick the door, and it lights up
    again... ;-)
     
  12. gregz

    gregz Guest

    I have a flyer for one at $18
    Here is another

    http://www.harborfreight.com/catalogsearch/result?q=98085

    Greg
     
  13. gregz

    gregz Guest

  14. miso

    miso Guest

    You would certainly want a PIR based sensor, but they require a
    detection in the change of heat (i.e. person enters the can) and that
    takes detection circuitry. [At one time switch cap, but today just
    sample data system).

    I'm more inclined to go for a high efficiency green LED and just run it
    all night from a battery that is charged during the day. Look at those
    cheap outdoor LED garden lights for inspiration. Green is where you eye
    peaks, and for some reason it also is a wavelength that is efficient for
    LEDs. [There are papers that go into the wavelength where your night
    vision is most efficient, and this differs from where your eye peaks in
    daylight.]

    I've seen these lights with white LEDS for as cheap as $2. In the past,
    I used to plop down these cheap lights on remote mountaintops on BLM
    land. Eventually somebody would climb where I planted a light and remove
    it. I guess the BLM thought I was destroying the night time scenery.
    These are non-trivial climbs, so somebody must have really been POd to
    go through such effort and remove the light.

    If you roll one yourself, I assume you just trickle charge a NiMH with
    the solar cell, and high side current sense when the solar cell is no
    longer producing current, which is your clue to power the LEDs. Probably
    an over-voltage detect on the NiMH, though if you size the solar cell
    properly, I bet just trickling would be fine. I doubt these cheap
    Chinese lights are very sophisticated.

    While you are at it, an electric fan in the outhouse would be appreciated!
     
  15. mi

    mi Guest

    Google or look from Amazon 'pir battery led'.

    Or get a panasonic PIR sensor from Mouser and connect it with a LED.
    To prevent LED from using the battery during day, add LDR.
    The PIR sensors consume about 1uA, so they can run on battery for quite long time.
     
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