A guide to creating illuminated shapes with balloons and LEDs. Although this instructable demonstrates how to create a red-illuminated balloon heart, these techniques can be used to create most any shape (possibly 3-dimensional) of your own design. The actual assembly of this example took approximately 2 hours to complete.
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Step 1: Materials
The materials needed for this project include:
-20 latex balloons
-20 3v coin cell batteries
I used red LEDs and pink balloons, but any colours will do.
Step 2: Assembling the LEDs
The balloons are illuminated by LED-throwies which are documented in several variations on instrutables. Here is how I made my Led throwies.
First trim down the anode ( + long lead) and cathode ( - short lead) so that the length of either lead is shorter than the diameter of the battery.
After the leads have been trimmed down, wrap a strip of paper around the cathode lead of the LED.
Then, insert the battery between the leads of the LED with the strip of paper. I used scotch tape to hold everything together, but most any tape will do.
Step 3: Assembling the Balloons
I did not have a tank of helium to fill the balloons myself, so I went to a local grocery store and ordered 20 pink latex balloons. I asked if they would mind putting throwies into the balloons before inflating and they were willing to help. So, I left them with the 20 pre-assembled throwies in a bag labeled with instructions to pull the pink slip of paper out to illuminate the LEDs. An hour later I pick up my balloons and was ready for assembly.
I doubled over strips of tape t stick the balloons together side by side. The reason I had popped a balloon was that I pulled the tape on the balloon and the latex ripped. As a precaution I also tied the balloon strings together as a stress relief for the taped areas.
Step 4: The Layout
I had planned on using 20 balloons to complete the shape (see first diagram), unfortunately while taping the pairs together I popped one balloon. So, I reconfigured the layout to use 19 balloons, which worked out well.
Step 5: Final Steps
After taping the balloons into pairs, I assembled the row lengths then connected each row. Here are a few pictures I took of the row assembly.
Once completed I walked these balloons across town to deliver them and not only wowed many people along the way, but also impressed my girlfriend.