Hacked Gadgets Forum

April 12, 2006

What to do with Blue Balls

at 2:24 am. Filed under DIY Hacks, Electronic Hacks, Funny Hacks

I started by drilling three holes in the cap. One for the 9 Volt power wires and two for each lead of the photo-cell. A bit of hot glue held the photo-cell and battery leads in place (gotta love hot glue).
All of the leads were simply soldered together to make the circuit. Most connections were too close to use any heat shrink but a few well placed drops of hot glue should keep things in place 🙂 .
The unit is done and ready for testing. First time I powered it up nothing happened… I had the LED in backwards. I guess I wasn’t following my own rule of check twice and solder once. Oh well, easy fix.

I made the unit so that the LED would sit near the bottom of the bottle neck. This seems to be a spot that allows the LED to light nicely.


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161 Responses to “What to do with Blue Balls”

  1. Alan Parekh Says:

    Hi Steve,

    All of those details are provided (there are multiple pages, look in the lower right corner of the article)

  2. DYI Project Bawls and recycling. « Madarame’s Daily Blurg Says:

    […] September 22, 2009 · Leave a Comment Hello and greetings fellow bloggers and gamers. Tonight I’ll be posting a DYI Project on how to build a sensor sensative Gamer’s Light to spark up that avid gamer’s bedroom or apt. Here is the Video with a walk thru with commentary and all. Thank Hackedgadjets for this project please and show your support […]

  3. c0ntraman Says:

    Hey guys,
    I bought the required components but, I have just one question… what size Photocell do I use? Thanks for any helpful comments.

  4. Alan Parekh Says:

    Hi Contraman,

    The size doesn’t matter, just make sure that it increases in resistance when it gets dark.

  5. morales2k Says:

    First off, I want to thank Alan for an awesome DIY project. This can also be done with anything, from empty juice bottles to wine or rum bottles. Now on to my suggestion.

    Alan said:
    “It is best to place it on something that is white or at least a light color. The LED is pointing straight down and a good reflective surface helps. I am thinking of cutting a small round white disc of cardboard and gluing it to the bottom.”

    And a good thing could be a cd or dvd disc. I have a ton of those hanging around my closet because i refuse to throw them shiny things away. They are reflective enough to bounce off light very nicely. An empty cd or dvd case can also be a worthy container for your led lamp design. I loved the photocell usage. Had not seen one like this ever.

    I am also relatively new to these things, could you comment on the transistor usage? What is it for!? My electronics course pretty much covered resistances, and how to combine them to get higher or lower ohms from them, but I never learned about these other parts.

    Thanks in advance!

  6. laxmi sah Says:

    Hey guys,
    plz give me a circuit

  7. Alan Parekh Says:

    Hi Laxmi,

    There are many pages to this article, click on the other pages to find the circuit.

  8. Luiz Says:


  9. Chris Says:

    I’m trying to do something similar heres what i got, i’m trying to put a photocell in a string of 20 battery powered leds, how would you put it togeter i’m stumped Thanks

  10. Don Says:

    Wow! I’m years late but this still amazes me! It’s so cooooool!

  11. Steven Says:

    Yeah this is cool.
    Does anyone know how I can figure out how to make this with a 2-3 foot strip of leds instead of just one? Would I need a lower value resistor and more battery?

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