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Lighthouse beacon for yard lighthouse

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by Loxlady, Sep 3, 2017.

  1. Loxlady

    Loxlady New Member

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    I would like to know how to build a rotating light beacon for a yard lighthouse.
     
  2. Loxlady

    Loxlady New Member

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    Using solar power
     
  3. dougy83

    dougy83 Well-Known Member

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  4. dave

    Dave New Member

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  5. atferrari

    atferrari Well-Known Member

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    Too slow for a common lighthouse.
     
  6. dougy83

    dougy83 Well-Known Member

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    I guess she'll just have ships crashing in her backyard then
     
  7. atferrari

    atferrari Well-Known Member

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    :nailbiting::nailbiting: :facepalm::facepalm: :p:D

    Salvaging one from a crashed cop car maybe is an option. Ready made.:)
     
  8. dr pepper

    dr pepper Well-Known Member

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    I have a garden ornament thingy which has a led and a rotating mirror, the mirror is rotated by what looks like a clock movement, only much faster, you might be able to get the movements off ebay, or how about a cheapo mirror ball rotator.
     
  9. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    Interestingly, while I live as far from the sea as it's possible in the UK, we have a local lighthouse :D

    http://www.crich-memorial.org.uk/index.html
     
  10. atferrari

    atferrari Well-Known Member

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    Small stepper?
     
  11. Externet

    Externet Member

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    Last edited: Sep 4, 2017
    • Like Like x 1
  12. ci139

    ci139 Active Member

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  13. MrAl

    MrAl Well-Known Member Most Helpful Member

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    Hi,

    That's so that the local kangaroos dont bump into each other at night :)
     
  14. MrAl

    MrAl Well-Known Member Most Helpful Member

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    Hi,

    Nice idea.

    Rotating electronic things are a little harder to make than electronic non rotating things.
    One idea if you could accept it, would be to have multiple high power LED's arranged in a circle pointing outwards, then turn one on at a time so as to make it look like one is rotating. The more LED's the smoother the action.
    The main point is that the reliability should be much higher than a mechanical movement.
     
  15. AnalogKid

    AnalogKid Well-Known Member

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    As Ex said, a clock and a 4017 get you most of the way there, but there are two problems. First, the 4017 can source only about 4 mA, which is enough for late night visibility but a bit weak for evening. Second, the LEDs snap on and off crisply rather than appear to fade up and down. To fix both, try this:

    For each of the 4017 outputs, add a series resistor, shunt capacitor to GND, and a MOSFET such as a 2N7002 as a source follower to drive each LED. With the right component values, each FET will have an approximate triangle wave at its gate. Each LED will ramp up to its peak brightness, then as it starts to ramp down the one next to it will start to ramp up. This should be much closer to the sine-squared brightness profile of a single rotating point source of light. Depending on the beam width of the LEDs there will be an optimum distance for the rotating effect.

    A 0.5 s clock period will produce a 5 second "rotation", which feels about right for a starting point.

    ak
     
  16. AnalogKid

    AnalogKid Well-Known Member

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    Something like this. Only one output stage shown, no decoupling, no power conditioning, etc. Vcc should be 9 V or greater. Modify R3 per the specs for the LED.

    ak
    Lighthouse-1-c.gif
     

    Attached Files:

    Last edited: Sep 6, 2017
  17. dr pepper

    dr pepper Well-Known Member

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    Its a long time back so the video is bad as I had a cheap camera, however I built this for a lighthouse the mrs turned out of wood, it looks good in the lighthouse.

     
  18. MrDEB

    MrDEB Active Member

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    Analogkids idea is viable but cascade 4 4017s together for a really smooth rotating effect. A pic using mosfets would be the best solution. Then only 1 micro is needed and chariplexing the leds.
     
  19. MrDEB

    MrDEB Active Member

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    here is a actual working schematic plus I think I have a couple of extra pcboards un-populated.
    This design has a variable speed adjustment as well. You just need the parts and the pic programmed. This only has 20 outputs.
     

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  20. KMoffett

    KMoffett Well-Known Member

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  21. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    Hope this video works. If not. post #19, go to link, go to bottom.
    Think on this: 5 LEDs facing different directions. All LEDs are driven with the same current and produce the same light. When five people standing around the light house, they will see the same thing at the same time. They will think the light moves in a circle but it does not. (fake and in your head)
    LED current timing, 0,0,0,0,1,2,3,4,10,10,4,3,2,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0, repeat.
    Watch the video and think "not spinning". Now think "spinning".
    -------------------------------------------------------------------------------------
    You can make 5 LEDs do the above pattern 1/5 out of phase. I think each person will see the same thing as above.
    -------------------------------------------------------------------------------------

    What do you think. Does a stationary light house rotate in your head because you are programed to see it rotate.
     

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