Instructables
Picture of LED Poi
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For the LED contest, I wanted to put lights on something that moves. Poi are something I've been tempted to try for a while, and seemed like a good application for LEDs.
 
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Step 1: Materials

Picture of Materials
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These poi are constructed from a pair of hollow rubber balls on ropes. I've inserted 5 LEDs in each ball, powered by 12V batteries. The ball is covered with a balloon.

Things you'll need:

- 2 hollow balls - mine are around 3 inches in diameter
- 10 (or more) LEDs and some spares
- electrical wire
- 2 12V batteries (it's possible you'll need more power if you use more LEDs)
- rope
- 2 balloons - I used 12 inch balloons
- electrical tape
- four large washers (to add some weight to the balls)
- velcro and conductive thread (I used these to make a switch)
- glue

You'll also need a soldering iron, wire strippers, a drill, a utility knife, a needle, and pointed scissors.


Step 2: Test your circuit


First, decide how many LEDs you are going to use. It is helpful to use a breadboard or similar to test the LEDs with your intended power source.

I ended up deciding to wire the LEDs in series and not use a resistor, but your circuit may be different if you use more or fewer LEDs than I did.

My poi use standard 5mm green LEDs. (I was originally intending to use super bright LEDs, but I broke one and didn't have a spare.)

The 12V batteries are conveniently small enough to fit inside the balls, and 1 battery provides enough power for the 5 LEDs.


kangel11 year ago
"to test the batteries with your intended power source" ?? O.o do you mean test the LEDs with the intended battery power source?
Thursday (author)  kangel111 months ago
You're right. I fixed it. Thanks!
kharris112 years ago
Nice Post, im actually looking for some content contributors, to posts tutorials and other articles on my website, i cover subjects such as poi, fire spinning, twirling , circus skills, flow lights and loads of other stuff that makes you jump in the night.
for any avid contributors i will be sharing the advertising income depending on what they have submitted, if any of you guys fancy it hit me up on my site, if your not but you still like poi and fire spinning etc head over and check it out an join the forums :) much love http://www.aboveandbelow.org

p.s we dont sell anything and its free to join!
omnibot2 years ago
Cool! I love these. Has anyone combined these with various blinking circuits yet?
Pyssling2 years ago
This is great, I want to make a dynamo powered version for my girlfriend as x-mas gift, does anyone have an idea how to do that?
Thursday (author) 3 years ago
Sorry, but I haven't really learned to use them yet, so you are far better off looking at videos of people who are good at it =)

I might be able to do a video of the switch, though.
can you please add a video of you using them!? :D that would be cool. and showing how you turn them on and off. i'm sure other ppl would love it too! :)