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  • Author Author: fmilburn
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Gravity Assisted Blinking Coin Cell Christmas Tree

fmilburn

This is a project I did with a friend just before Christmas that I was able to get my grandson involved in.  The idea is to use a CR2032 coin cell to power LEDs as it rolls down a ramp.  The project is constructed from foam board cut out with a hobbyist knife and copper tape used to make the connections with the coin cell.  It is best understood by seeing it in action....

My grandson thought this was the greatest and even suggested an improvement for next year:  Put 25 LEDs on the tree and then use jumpers to add a new LED everyday.  Every day a new LED would be added and the tree would count up to Christmas.

 

It doesn't get much simpler than this.  We entered it in the Hackaday single coin cell competition.  If you have additional interest in the construction and other ideas we looked at then see it here:  https://hackaday.io/project/28793-gravity-assisted-blinking-coin-cell-christmas-tree

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  • in reply to fmilburn

    The title is very descriptive - the way engineers label stuff.image

    If it was a military project it might be RADBOL (rolling and dropping battery operated lights) image

    If it was an Apple product it might be i-tree (interactive tree) image

    If it was a Nintendo game it might be Mario's LED Adventure. image

    If it was a movie it might be The Pyramid Temple of Doom. image

Children
  • in reply to dougw

      wrote:

     

    The title is very descriptive - the way engineers label stuff.

    If it was a military project it might be RADBOL (rolling and dropping battery operated lights)

    If it was an Apple product it might be i-tree (interactive tree)

    If it was a Nintendo game it might be Mario's LED Adventure.

    If it was a movie it might be The Pyramid Temple of Doom.

    That is hilarious.  My daughter was a journalism major and she made the same observation.  Of course, I am an engineer - what else could you expect image