Hacked Gadgets Forum

April 12, 2006

What to do with Blue Balls

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

Here are all of the parts that you need.

Click on the schematic (and all other pictures) to enlarge it. Sorry for the hand drawn schematic 🙂 Depending on the resistance of the photo-cell that is used the 100K ohm resistor may need to be larger or smaller. If the resistance is not correct the circuit may not function properly. For example if it is light it may stay on or if it is dark if may stay off. To find the best value you could use a potentiometer to vary the resistance until the best value is found. Elmetal had a great idea to add an On/Off/Auto switch to the design, here is a schematic to do that.
All of the parts found their way onto the breadboard for some testing to make sure the design works before soldering it together.

This bottle is itching to be hacked!


As might already we be at big of and which probably cialis . Consumer about medication includes side...

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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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