How to demonstrate RGB=White to kids

Discussion in 'Tips and Tricks' started by robj, Jun 19, 2013.

  1. robj

    robj New Elf

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    Anyone have a good way to demonstrate the additive property of combining Red, Green and Blue result in white light? I want to show a group of kids but can't find a good demo project. Tried flashlights with home made filters but can't get the mix to work.

    Ideas welcome!
     
  2. Madko

    Madko Full Time Elf

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    Other then using a pixel and setting it red, green, blue then all together ( had to say that as this is a lighting forum), if you can make a round wooden disc, divided evenly into three sectors. Paint each sector red, green, blue. Drill a hole in dead centre and put a long bolt and clamp it into a cordless drill. Hopefully you can get the colours right then hopefully at a high speed (theorically) white should appear!
     
  3. penguineer

    penguineer Full Time Elf

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    Sort of a class thing?

    How about dumb nodes with seperate red, green, blue channels and a physical dimmer switch for each channel - using computer+software+magic boxes in the middle makes the whole thing look too staged, get the kid(s) to control it.

    Get a volunteer to control each dimmer
    - each volunteer plays with their own dimmer in turn so they can see the control they have over the colour(each returns to zero after their turn)
    - each colour gets turned on slowly in turn (slow add to white)
    - get them to make specific colours (which colours add to which to make what)
    - free play, see what colours they can work together to mix

    Should need a dumb string, power supply and three dimmers as well as cable to connect together.

    Dumb String:
    http://www.aliexpress.com/store/product/IP68-DC12V-input-12mm-through-hole-LED-channel-letter-RGB-color-100pcs-a-string/701799_522236867.html

    Single dimmer:
    http://www.aliexpress.com/store/product/LED-Dimmer-DC12V-24V-input-P-N-LN-XDIMMER-1CH-12V/701799_307327655.html

    Three dimmers on one block:
    http://www.aliexpress.com/store/product/3-channel-led-constant-voltage-dimmer-DC10-30V-input-6A-each-channel-output/701799_533629672.html

    How does that sound?

    Cheers
     
  4. nato595

    nato595 Let's do this!

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  5. OP
    OP
    robj

    robj New Elf

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    Outstanding ideas guys. Thanks! Rob
     
  6. BradsXmasLights

    BradsXmasLights WiFi Interactive

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    I remember the RGB Colour mixing display at the Queensland Museum as a kid. It was just 3 dimmer sliders with separate stage lights for each colour. Worked a treat!
     

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