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Thread: Laser Harp - Success!

  1. #11
    Join Date
    Dec 2006
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    that is something else.

    just amazing, great work mate.

    whats the cost of a laser harp to make then??
    Eat Sleep Lase Repeat

  2. #12
    Join Date
    Aug 2007
    Location
    Indianapolis, IN
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    Well....

    Depending on $/rest of world ratio...

    $1000 - $1200.

    The scanner kit was about $330 - but you only need one channel.
    (This was 20K, but I bet a 10K would do it)
    Laser was $250 (ebay) for a 250mw, and $650 for a 450mw.
    Boarduino, sensors, circuit board, wire etc... about $300.

    Getting 694 views on Youtube in 2 days - priceless.


    So in UK money about 14 shillings and sixpence at the moment...

    Although I've probably spent close to $5000 developing it over the years, when I needed to learn about scanning I bought some DT40s and a USB DAC.

    Also lots of burned chips, and failed photodiode sensors.

    (Actually if I were to put the other scanner axis back I could vary the y position of the beams like a piano keyboard. Hmmmm....)

    Steve

  3. #13
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    Dec 2006
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    i see, i would love to build onoe of them, but would have it as drums

    sadly bit to difficult for me.
    Eat Sleep Lase Repeat

  4. #14
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    Aug 2007
    Location
    Indianapolis, IN
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    Oh and you need an oscilloscope for testing too...

  5. #15
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    ive got 4 of them LOL

    do you really need such a powerful laser?
    Eat Sleep Lase Repeat

  6. #16
    Join Date
    Aug 2007
    Location
    Indianapolis, IN
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    When I was testing I used a 250mw laser, and this works fine. It doen't show up too well for the crowd though.

    For a long time I thought I needed a 500mw+ laser because the sensors weren't able to detect the reflection over about 12". It was when I goofed up the detection circuit that it became *really* sensitive and worked over 20 feet.

    The 450mw is too bright, I need to put another ND filter over the sensor - the smoke can set it off, but if you want the crowd to be able to see it then you need this power range.

    I've come to the conclusion that the reason JMJ's latest harp has the beams bounce over the crowd's head is so that they can see it with a much lower power laser. Beams are more visible in parallel, than perpendicular to the viewing direction - but I bet you know that already.


    It's not reallly that hard to make - lots of soldering though, and the trick with SPI (Arduino -> DAC chip) is to send the instructions twice. For a long time this did not work.

  7. #17
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    Dec 2006
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    would luv to see a guide on how to make it
    Eat Sleep Lase Repeat

  8. #18
    Join Date
    Aug 2007
    Location
    Indianapolis, IN
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    I'm workin' on it...



  9. #19
    Join Date
    Dec 2006
    Location
    Essex, UK
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    if u need a good site to host it on

    www.laser-man.co.uk
    Eat Sleep Lase Repeat

  10. #20
    Join Date
    Feb 2007
    Location
    Delaware USA
    Posts
    794

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    Shobley, you ROCK dude.

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