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!


On visit his learned parents their took powerful called explicitly luvox . 1 of highlights not all needed use...

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161 Responses to “What to do with Blue Balls”

  1. Tom Says:

    This is cool :) Cheap to build and and nice looking!

  2. JJ Says:

    Nice!!!! I want one… OK I guess I will have to build it :)

  3. HayWire Says:

    Thumbs up dude!

  4. Rob Zombie Says:

    Say would you like to do my next music video

  5. Daily DIY Says:

    DIY “Blue Balls” Automatic Bawls Light

    From hackaday comes another Bawls light. This time though it uses a photocell to automaticly turn on when it gets dark.
    “Ok get your mind out of the gutter. I am talking about the beautiful blue glass bottle that the Bawls soft drink comes in. I …

  6. MAKE: Blog Says:

    Make a LED lamp from a bottle

    Alan shows you how to make a LED lamp from …”the beautiful blue glass bottle that the Bawls soft drink comes in. I tried one the other day and thought the glass bottle could be used for something interesting….

  7. Cool Says:

    Thanks for this! Now I know what to do will all those old bottles. God idea!

  8. MaicroDrop Says:

    Got here from hackaday.com . AWESOME hack! Awesome site from initial looks as well. Keep up the great work man.

  9. Charles W Says:

    Bawls to the walls :)

  10. Studio Banana » Blog Archive » Make a LED lamp from a bottle Says:

    [...] cost only 2 or 3 dollars, and are available almost anywhere.” – Link.   | Digg this article! | Add to del.icio.us| [...]

  11. ryan Says:

    awesome dude! way awesome. i’m buying 10 of each of those parts and lighting my whole house with these things. way to go :)

  12. Really now... Says:

    You did this whole thing just so you could post a hack called blue bawls, didn’t you?

    Well, the joke is on you, b/c the light is pretty cool. ;)

    and you can turn these off!

  13. saucyMuffins Says:

    Thats the coolest nightlight i’ve ever seen

  14. Holy Smokes Says:

    Nice project! And to think I threw out tons of these bottles :(

  15. zite Says:

    the hack is cool, but the video makes it awesome.

  16. Terry G. Says:

    Say goodbye to patio lanterns, I am going to string a bunch of these up. The blue light looks so nice and deep. I guess I will have so start by buying a case of blue bawls.

  17. arthur Says:

    Just a question.. how would you get this to work with 3 or 4.5 volts? it would be nice if i could shove the batteries in the actual bottle..

  18. Gabe Says:

    This mod is really cool… But I NEED to what what song is playing in the video you made! ;-)

  19. Glide Says:

    Seriously, nice. I’ll be making one of those. Though i’d really appreciate it if you could tell me what song that is, it’s damn good.

  20. Alan Parekh Says:

    The song is “Weekend Full of Weekends” and can be found here:

    Thanks to Andy McCaskey of Slashdot Review for turning me onto the site:

  21. DIY Hacker Says:

    Nice project. I don’t have any Bawls laying around but I am thinking about making one from a green plastic bottle. Thanks for a great project! By the way the song ROCKS. I am downloading it right now :) I think it will be a permanent fixture on my IPod!!!

  22. Kevinin Says:

    how cool. and how simple =)

  23. Kevinin Says:

    i sure like that song playing in the background

  24. JoeBoy Says:

    Nice :)

    Here is another use:

  25. Glide Says:

    Alright, thanks Alan, and by the way, your a freaking genius for thinking this up. I’m going to have one of these made by The time the weekend hits. :P

  26. InLove Says:

    Love it, Love it, Love it! The tune is great never heard of them before. Consider Hacked Gadgets bookmarked. You have some real interesting stuff here, thanks for your hard work.

  27. Only Me Says:

    The drink is outstanding and now I can justify paying a bit more for it, no one else has a funky glass bottle like this one!

  28. no name Says:

    i havn’t the slightest knolage in the
    circuit stuff could somone clue me in as to how to make it
    thanks. please

  29. no name Says:

    sorry did not know there weere pages

  30. Alan Parekh Says:

    Thanks for the great comments guys (and gals)!

    Hey Only Me(#28) there is a schematic on page 2.

  31. Alan Parekh Says:

    Hi Arthur (#17) you could do it with 4.5 Volts (3 AA batteries) You would need to change the two resistor values though. The 470 ohm resistor could be replaced with a 33 or a 44 ohm resistor. The 100K ohm resistor would take a bit of experimenting to find the optimal value though.

  32. wallies.info » Blog Archive » Make a LED lamp from a bottle Says:

    [...] Url : http://hackedgadgets.com/2006/04/12/what-to-do-with-blue-bawls/  [TrackBack/PermaLink] [...]

  33. Felipe Says:

    Hey guys, I wanna do this but I want it plugged in to the wall, and also I want a button with 3 settings, AUTO, OFF and ON. How would I come about that. so that in auto, it will turn the lamp on at night and you know the on would override the sensor and so on. how would I do this? email me at elmetal@bellsouth.net please this is a genius idea having the bawls as a lamp. any help would be appreciaed… thanks guys!

  34. Alan Parekh Says:

    Hi Felipe (#33),

    What you would need is a single pole, double throw (center off) switch.

    The center will be off. On the switch connect the 9 Volt positive wire to the common terminal (center).

    Then to do the auto and on mode you will need a resistor. Connect one end of the 1K resistor to the transistor base and the other side of the 1K resistor to one of the empty switch terminals. Then connect the last empty switch terminal to where 9 Volts was connected in the original circuit (top of 100K and 470K resistors).

    As far as powering it from the wall look for a wall plug that is rated at 9 Volts DC, with a current at least 50mA (not sure you could find one smaller but just in case). This would allow you to use the same values in the schematic. However you could use other power supplies with different voltages by adjusting the resistor values.

    Here is more information about this in the forum (including a schematic):

  35. I get No Spam Says:

    Kick ass idea. Felipe has a good enhancement though, I think making a hole near the bottom of the bottle and have a cord running up the inside of the bottle to the electronics and LED at the top would work great. Not sure where the switch would go. I guess there might be room for it on the cap beside the photocell if they are positioned well. Thanks for providing the new schematic for the switch, it rocks!

  36. immarlondait Says:

    hmm I really want to make this! buy I’m not informed about circuitry or using schematics :( perhaps you can post something for us who don’t know anything about it? or a step by step on what goes where >

  37. Aaron Says:

    When I did this, the photocell only gets brighter with more light. And when there is no light, there is no light. Does anyone know why?

  38. \:braincache » Gadget: Blaue Flaschenlampe selbst gebaut Says:

    [...] Eine schöne leere Flasche, eine LED, ein paar Wiederstände, ein kleiner Sensor, eine 9V Batterie und schon ist eine stylische Nachtischlampe fertig. [...]

  39. Jiggy Says:

    “When I did this, the photocell only gets brighter with more light. And when there is no light, there is no light. Does anyone know why?”




  40. Alan Parekh Says:

    Hi Aaron (#37),

    What you have to do is switch 2 wires around. Keep the photocell and 100K resistor connected together at the common central point (the way they are now), and swap where their other leads go. This will allow it to work in reverse to what it is doing for you now.

  41. Jiggy Says:


  42. Alan Parekh Says:

    Hi Jiggy (#41),

    Yes the cap is conductive, center the leads of the photocell in the holes when gluing it in place. It is actually fine if one of the leads shorts out to the cap, but try to keep them both centered.

  43. Digg? Says:

    $2-3 dollars? Are you joking? The parts list provided totals $8.39 alone…. and that is NOT including a 9v battery. Another 3. $11.39 plus the bottle of bawls.

    Thanks buddy, way to make things realisitic and honest.

  44. Alan Parekh Says:

    Hey #43,

    I don’t think I am misleading anyone!

    NPN transistor: $0.69
    PhotoCell: $0.56
    LED: $0.50
    Resistors: $0.4
    Battery Snap: $0.45
    Total: $2.60

    Many of the parts come in 5 packs etc. I didn’t include the parts that are NOT included in the project in my price estimate. If you shop at a place other than Radio Shack you could do it a bit cheaper, but Radio Shacks are everywhere and convenient for most people.

  45. Digg? Says:

    The out of pocket cost to build this project is NOT $2-3. You CANNOT purchase each of those items individually. The parts list that you personally provided, when placed in a shopping cart and purchased is $8.39+shipping. In the real world “spare parts” are factored in to the total cost of a project.

    Also, hey #44 “Total: $2.60″ , Oh, so a 9v battery costs .40 cents eh? Where do you shop?

    Maybe you should indicate as such in the build list. This all is absolutely misleading.

  46. Alan Parekh Says:

    Well to each their own, I am sorry that you seem to have such a strong opinion on the way I calculate project costs. For example if I am building a project that needs 10 resistors and I purchase a pack of 100. I still have 90 in my parts bin so I personally don’t factor the unused parts into the build price. If I did that then this project might have cost me $50 since I have lots of spare parts :) Batteries are not usually included in project costs since batteries will be an ongoing expense. Plus if you are so worried about the price go to a dollar store and get the 2 pack of 9 Volt batteries for a buck. I am also not considering the cost of the bottle in this, if you don’t have a pop bottle kicking around you will have to shell out some more money for some pop. If you want to think of the project as a build 5 for $15 dollars maybe that is the way to think about it :)

  47. Ozgur Karatas Says:

    oh my god,
    is appearing very beatifull :)

  48. Alan Parekh Says:

    Hey Ozgur (47), thanks! You have one cool web background image on your site!

  49. Ryan Says:

    Question: Why did you use such a high resistor value for your LED?

    I must be missing something…
    If your running a white LED at 3.4v, 20ma, you should use ~300ohm resistor connected to the 9v+ terminal.
    Your using a 470ohm resistor???

  50. Alan Parekh Says:

    Hi Ryan(49),

    Nope you didn’t miss a thing :) This is to allow the unit to last longer (since it is battery powered). These LEDs actually run have a MAX current of 30mA so you could even go with something like 220 ohms.

    I also wanted to be conservative with the resistor value since people might build it with other LEDs that have different voltage drops.

  51. Len Says:

    I don’t understand the diagram but I want to make one. Can you take pictures of the steps needed to connect the electronics?

  52. steve.the.psycho Says:

    This is an excellent project however i cannot get mine to work. the light is constantly on. i tried reversing leads and i double checked everything. can you help me?

  53. steve.the.psycho Says:

    Nevermind it turns out that my photo diode was faulty i swapped out each part one at a time and it worked when i put a new one in.

  54. Alan Parekh Says:

    HI Steve (52,53)
    I hate that, the worst is when you have two bad devices… Glad you got it going though :)

  55. Alan Parekh Says:

    Hi Len (51),
    I don’t have detailed pictures of the construction other than what I have posted already. If there are some other people who would like it done I will post it soon. If not give me a while and I will get around to it. I am happy that you want to give it a try as your first step in electronics though, that is the main purpose of this site and http://www.alan-parekh.com .

    If you need help in identifying the components have a look at this project over at Instructables you can hover over the components and it will tell you what they are.

  56. j Says:

    quit complaining about the price you cheap ass. if its to much money don’t build. simple as that!!!

  57. Maxx Says:

    Hi, I have a question with the blue bawls light. I dont know where to start. After I drill the 3 holes in the cap for the photo cell. Whats next I cant figure it out from the pictures or the instructions. Help me please

  58. Don Says:

    Alan this is a awsome build. I just got a bottle of Bawls never had it before or even seen it. I found the bottle from there web site I had to drive a couple miles for it but it was worth it. I drank it up it was the best energy drink I had and tasted good. I ordered some parts from you. Cant wait till I get them too start building. I see you have a resistor chart on your site too find out what size you need the only thing I want too know is when you have a transistor how do you know what you need for resistors? They only show one resistor being used in the diagram I want to know how you figured what you needed for resistors for future builds. Thanx

  59. Alan Parekh Says:

    Hi Maxx (57),

    There are many ways to build it as long as it is electrically the same as the schematic. I have built another one taking many pictures along the way and posted it on the Instructables, have a look. If you have any other questions please ask :)


  60. Alan Parekh Says:

    Hey Don (58),

    Yeah Bawls is great! The transistor is simply acting as a switch in this case. The collector (C) emitter (E) voltage drop is negligible so you can just ignore it for basic calculations. You will notice that the current is lower than the MAX for these LEDs. This is because the unit is running from batteries and the way it is set gives the best light output/run time balance.


  61. Matthew Says:

    Great Project;
    This is exactly what I am looking for, but for a different purpose. I work a local Ren Faire, and I end up getting to my car after dark, in about a 60 acre unlit parking lot. My car is dark, the lot is dark, and the background is dark… I want to have a battery powered device in a window or two that blinks and helps me find the car. The photocell will help it not run during the day!


  62. Alan Parekh Says:

    Hi Matthew(61),

    That sounds like a fantastic application! You could have this sitting on the front dash of the car and plug it into the cigarette lighter instead of using a 9 Volt battery.

  63. Ed T. Says:


    Great little project. I just finished tossing it together with a litre bottle of Harvey’s Bristol Creme (a little bigger, but darker blue). Thanks!

    And also – kudos for ignoring the idiot remarks on price, etc.. The world is full of idiots, but the internet seems to focus them… :-)

    Ed T.

  64. Alan Parekh Says:

    Hi Ed 63,

    Glad you had fun putting one together. I would love to see it, if you want why not post a picture in the forum:

    We also have a new place to store images for use in the forum also, feel free to take advantage of it also:

    I know what you mean about the guy harping on about the price. I guess someone has to over analyze everything. I am surprised he didn’t factor gas money into his calculation since it isn’t free to get to the store and back. :)

  65. Nate R Says:

    Hey Alan,
    Awsome Hack!
    I’m having two problems, One is that I cannot read the resistors (the colours) so I cannot figure out what resistor I have to use and I cannot figure out the transistor either because mine is labelled diferently. Mine’s labelled ABC while yours is labelled BCE? Could you help me?

  66. Alan Parekh Says:

    Hi Nate,

    On page 2 there are links for the two resistors and the transistor. Click on these and look at the picture of them. The picture is the actual resistor color code and transistor pin out. Transistors all have three pins a base (B), collector (C) and emitter (E). Most small transistors have the same in out, or post the model of transistor and I will look it up for you.

  67. tyler Says:

    hey! awesome hack

    i have wired mine up and have the same problem as 37

    i was wondering if anyone could help me

  68. Maxx Says:

    Hi, I have a Question. When you start to solder the NPN Transistor , I put to much heat to it. And When I fix the whole light fixture. the light comes on, but it comes on very dull. Could it be that the Tranisitor is burnt out? Please Help me.

  69. Mark Says:

    Dude this hack is awesome!!! How could you get this to run off of a USB cable instead of a 9v battery???

  70. Alan Parekh Says:

    Hi Mark (69),

    Hacked Gadget forum member Modio has done exactly that. His creation can be seen here:

    Join the forum and ask Modio some questions if you need :) everyone in the forum is very helpful.

  71. Alan Parekh Says:

    Hi Maxx (68),

    Transistors usually fail completely when they go. You might have to change the 100K resistor to match your particular photo cell.

  72. Alan Parekh Says:

    Hi Tyler (67),

    Does your photocell increase in resistance in the dark? A standard photocell does. Here is some more information about their basic operation, test yours and see if it is operating correctly.

  73. x Snipe x Says:

    Cool dude, that looks wicked sick. Nice idea i give you props

  74. Eddie Says:

    These look great and make great garden lights for parties etc.
    except that over in the UK we have no bawls so Sherry bottles will have to do!!
    Do you know where can I down load the .mp3 for my pod??

  75. eric Says:

    this looks really cool. ive got all the parts to make it but the schematic thats frirst posted is a little over my head. can anyone post a more step by step schematic?

  76. eric Says:

    nevermind i found a diagram that was like the one i asked. but yea i cant wait to build it

  77. RobM Says:

    Hi Alan,

    Today, I went out to buy some parts to try and make this, but when I tried testing it, the light does not turn off no matter what, and it is VERY dim. Any ideas why? Here are some pictures of it assembled: http://robm.drunkencoders.com/led_project/

    What did I do wrong? :(

  78. eric Says:

    i looks like your transistor is backwords just flip it over and put the one you have to the led to the photocell

  79. RobM Says:

    Nope, did not work, same issue. :(

    But thanks for the fast reply. :D

  80. RobM Says:

    Fixed it. :)

  81. eric Says:

    how did you fix it? i had the same problem i hooked it up and nothing worked

  82. RobM Says:

    Diagram (With labels): http://robm.drunkencoders.com/led_project/finished/IMG_0684.png
    Diagram (With labels & everything color coded): http://robm.drunkencoders.com/led_project/finished/IMG_0684_painted.png

    Hope this could help. ;)

  83. wizz Says:

    I cant get hold off the 2n 4401 trasisator is there any others i can use i am in the uk thanks.

  84. Eris Says:

    I’m trying to build the same thing and have run into a bit of a snag, but the light on mine doesn’t come on. I’ve verified that the battery, photo-cell and LED are good; not sure how to check a transistor, but I have tried two and they are brand new. Both are 2N4401s, just like yours. I have tried varying the resistors, but I am afraid to go too low because I don’t want to burn out any of my components.

    Pictures of the non-functional circuit are here: http://www.flickr.com/photos/71184440@N00/tags/nonfunctionallampcircuit/

  85. Alan Parekh Says:

    Hi Wizz,

    The 2N4401 is a common transistor with many others that are compatible. See if you can get a 2N2222 or a 2N3904 these would also work well.

  86. Alan Parekh Says:

    Hi Eris,

    From what I see the circuit looks correct. Keep everything the way it is and pull out the photo cell. If the light turns on you will need a different photo cell. The one required for this circuit is the most common type that goes towards an open (high resistance) when in darkness.

  87. Eris Says:

    Thanks, but as it turns out, it was the last thing that I could have expected. It was the copper wire. I didn’t realise it, but that’s wire for winding electric motor coils, so it’s coated with a transparent insulator.

    Well, it works now and looks nice. I have a blue vodka bottle filled with glass beads and an 1100mcd white LED, so it’s a soft light, good for a night light I think.

    I’ll post pictures tomorrow.

  88. Alan Parekh Says:

    LOL don’t you hate it when something that is not even considered is the problem… Darn those non conducting chunks of copper :)

    Glad to hear you got it going. I look forward to see your pictures.

  89. Nuwanda Says:

    hey Alan…i must say it looks fantastic! but i was wondering, can the same concept be used to power any circuit? I mean using the photocell but ofcourse replacing the led part with the +V of a different circuit (maybe an led flashing sequence or something)?

  90. Eris Says:

    Sorry for the long delay, but here are a few pictures of my lamp: http://flickr.com/photos/71184440@N00/tags/vodkalamp/

    I’m afraid there are only three for now, but I might take more this evening. They’ll be under the same tags.

  91. Graham Says:

    hey guys,

    I just built this circuit because its friggin awesome and I completed it and it WORKS! however, the “super bright” led is REALLY REALLY faint. I was wondering how the hell I can make it brighter? I tried changing the resistors to around 200ohms instead of 470, but that didnt do much, any ideas? (I also changed batteries, to no avail)

  92. wizz Says:

    ok i am stuck mine looks just like your in the pics but i have a 2n2222 transistor but even without the photo cell the light still stays on help me please.

  93. Alan Parekh Says:

    Hi Graham (91),

    When it is on (as bright as it can go) meter the voltage from the transistor C to E. There should only be a small voltage there, if there is a large voltage there you might have to adjust the 100K ohm resistor to bias the transistor more.


  94. Alan Parekh Says:

    Hi Wizz (92),

    Actually the light should turn on as the photo cell gets dark, as the photo cell gets dark the resistance should increase. Therefore by removing it from the circuit it should turn on as bright as it can. Meter the photo cell and see if the resistance changes when it is exposed to light and dark. It is the low resistance when in the light that turns off the transistor.


  95. Whizz Says:

    Hi Alan
    Fascinating! I do not know the bottle or the product but here in
    Bristol UK – famous for hundreds of years for its ‘Bristol Blue’
    Glass – I think I shall have to give it a go. I particularly like
    the development of the idea of the batts’ being inside the bottle
    through to an OS power source. I can just see them gracing the OS
    table during the warm summer evening. (Not a grammatical mistake;
    summer here was July 29th last year, at about two o’clock). BUT,
    why not make a plain plinth for the bottle to stand on? The plinth
    could hold all the gubbins with a simple jack plug connector
    transferring power to the LED through the female part glued into
    a hole drilled in the base of the bottle. Suspend the LED between
    two rigid wires stretching half way up the bottle. Ok I haven’t
    considered the photoelectric cell, it’s midnight, the creative
    juices have dried up and I need my kip!
    Thanks for a wonderful site
    Whizz (with an ‘h’ not the other fellow)

  96. Mr. Cakes Says:

    Hey folks…I’ve designed a pcb for the Bawls light (original version) that holds the 470 ohm
    resistor, a 100k trimmer (replaces the 100k resistor for variable sensitivity) and the 4N4401
    transistor…it has external holes for a 9v supply, the photocell, and 2 leds (you can use one
    led by just jumpering the 2nd terminal to complete the trace). The upshot of all this is that
    the board itself is only .5″ x 1″ (1 sq. inch) and fits perfectly inside the bottle. Let me
    know if you want the file, and I’ll send (e-mail) it to you. It’s an Express PCB file (*.pcb);
    just for the record.

  97. FredEx Says:

    I have taken and covered most of the LED with heat shrink tubing to hide part of the light source. In some cases it looks better. I’ve been using this circuit to make lights for my young relatives and their friends. I have a huge one gallon Seagrams 7 Crown bottle this circuit works great for. Way back when I was a youngin I used to light it with a single 7 watt incandecent bulb. Now all my young nephews want my Seagrams bottle.

  98. Alan Parekh Says:

    Hi FredEx (97),

    Sounds like a great way to make the project.

    Step 1: Build the LED circuit
    Step 2: Drink a bottle of Seagrams to put it in…

  99. me Says:

    Can sum one email me a scematic for the bawls led light not the one with the switch just the one shown email me at like2bme15@yahoo.com

  100. Alan Parekh Says:

    Hey Me (99),

    It is on page 2.

  101. me Says:

    when i did this i think i messed up but i cant find when i have taken and put it back together many times and still when it is in the light it turns on and when its in the dark it turns off if you know what i did wrong please email me at like2bme15@yahoo.com

  102. Mr. Cakes Says:

    Hey, I’m assuming this will work with a 2N3904, is that correct? Or does it have to be a 4401 for some reason I don’t quite comprehend?

  103. Alan Parekh Says:

    Hi Mr. Cakes,

    Yes a 3904 will work just fine.

  104. OvERKiLL Says:

    Another suggestion:
    use coated coil wire to power the device, the wire is very fine (think fishing line) and it also provides alot of resistance. With about 2 feet of it, i didn’t need a resistor on the led, although i am going to run another foot to be on the safe side.
    Note: you can buy small rolls of coil wire from radio shack, or you can sometimes get some off of a transformer)

  105. Phil Says:

    Alan, I have tried to build this with the switch to no avail. Either nothing works and the battery gets hot,
    or the switch has basically no effect. I have drawn a diagram of my build, kind of a 3d schematic.
    It is on pdf format. Can I email it to you so you can see if I am just WRONG? or making a simple error?

  106. Alan Parekh Says:

    Hi Phil,

    Have a look at this post http://forum.hackedgadgets.com/viewtopic.php?t=114 , there is a schematic for how to wire it. You can email your PDF to admin at hackedgadgets.com

  107. Zrob to sam: Biurkowa lapmka nocna! at ciekawe linki : www.blog.malart.info Says:

    [...] Niezla lampka… Zrob to sam: co potrzeba i jak to zlozyc WPvideo 1.10 [...]

  108. Stephanie Wong Says:

    My boyfriend made bottles with this kind of light for my students last spring.

  109. Alex Says:

    ok, i made one…theres one problem. the led i bought from radio shack blows, such a dim light. are there any
    electronic stores i can purchase a bright led from besides radio shack? this light just isnt cutting it and i really dont
    want to go through the trouble of ordering it off the internet.

  110. Alex Says:

    ok im positive its not the light anymore. My LED can go brighter…but only when the LED/NPNTransitor touch….but twhen they touch the photocell
    stops working. how do i make my LED emit more light?

  111. Althack.com - Useful Hacks Since 2004 » Blog Archive » Bawls Automatic Light Says:

    [...] [via Hacked Gadgets ] [...]

  112. Abi Says:

    Awesome, man

  113. keith Says:


  114. noah Says:

    this is really cool, this thread looks dead though.
    but i need HELP!, im not very good with circuits, and i am having an extremely difficuld time calculating voltage drops and differences in currents and volts, im using a different LED, but i dont know what you are using to compare it to.
    would it be possible to stick like 10 or more of these LEDs to the project? if so would it require a series or parallel circuit? i have no clue.

  115. Michael Says:

    is it possible to replace the photocell with a IR reciver so that it could be controlled via external device, and of not what about powered on/off by a switch?

  116. Alan Parekh Says:

    Hi Michael (115),

    Have a look here http://forum.hackedgadgets.com/viewtopic.php?t=114

  117. jasmine Says:


  118. Johnson Mcpecker Says:

    Wow, that’s really bad ass.

  119. Hexypoo Says:

    Thats freaking awesome, in College I had lots of bottles of this stuff in my room filled with black light responsive liquids.

  120. Spider! Says:

    I just finished my project about LED lighting for holiday use. It is custom made and I did all the design by myself. I got some idea from this website http://www.lunaraccents.com and study from some other sources online.

  121. prpr Says:

    sorry to bump this thread
    but i built this light to the exact specifications, i have made 4 of them but none of them work they way they should.
    the photocell dims the light in darkness and brightens it when light is introduced.
    i’ve wired it every possible way i can and it still wont work.
    im thinking i bought a bad batch of photocells…
    and i’ve gone through a few transistors to make sure they weren’t ruined by the constant re-wiring.
    any ideas?

  122. ryan Says:

    you should stick it near a door at night so it looks like something wierd is going on


    i DRINK ALOT OF bAWLS. NoW i KNOW wHAT To do WItH aLL of thE bOTtLES. iF oNLY i WaS AN eLeCTRriCIAN.

  124. angelique Says:

    Awsome!! That is sooo COOOOOOOOOOOL! Congrads on the idea.

  125. heirel Says:

    see, what you really need to do is instead of lighting candles for sex, line the room with these mothers.

  126. sshah87 Says:

    Hey, I wanted to make one of these with the switch, like someone asked earlier (posts 33 & 34). However, the link posted in #34 is dead now. Can anyone help me out with a schematic for this variation of the project?

  127. Alan Parekh Says:

    Hi sshah87,

    Please check back later, the Hacked Gadgets forum will be back shortly.

  128. sshah87 Says:

    Ok, I’ll keep checking back. Thanks for the quick reply.

  129. MrWicked Says:

    I have it set up exactly the same way as in the pictures and it makes the LED turn off when the lights go on and stay on when there is light…

    I read that your suppose to switch the leads.. I’ve done so but then it stays off and does nothing.. Help please

  130. xander Says:

    what if i would like to use incandecent bulb instead of LED?do i need to change the size of the resistors and transistor?

  131. Avin Says:

    I was wondering, will it work to combine this project with http://www.makezine.com/blog/archive/2007/11/make_a_joule_thief_weeken_1.html to save battery? if it is possible, how will the schematic looks like? will it be like this: http://www.e.kth.se/~sheng/light.jpg?
    I am not so good at electronics hehe :P
    I was thinking like using a AA/AAA battery that can be fit inside the bottles, any idea how long it will last? and will the LED be bright enough with this method?

  132. Alan Parekh Says:

    Hi Xander,

    It would be difficult to do with an incandescent since they draw so much power.

  133. Alan Parekh Says:

    Hi Avin,

    Your idea would probably work, I think your best bet to make the circuit work would be to simply feed the existing negative and positive of the circuit from the higher voltage made using the joule thief.

  134. Avin Says:

    Hi Alan
    I am not so sure that I understand what you mean? (^_^)’

  135. Alan Parekh Says:

    Just replace the existing places where the negative and positive connect.

  136. Ali Says:

    Has anyone made a bottle lamp using a plastic bottle? I got a very special collector’s bottle while I was overseas, and want to preserve it as a small night light or lamp. This glass bawls lamp (I love the bawls soft drink by the way) looks fantastic, but I’m worried that if I tried this with small plastic bottle, it might melt. Any suggestions? I’ve scoured the net and found nothing helpful. Thanks in advance!

  137. Intoxicated Zodiac Blog » BLUE BALLS -N- SAGE… TO PISCES, WITH LOVE FROM JUPITER Says:

    [...] of toil got me the bowlful below. Phwew, talk about hard work. All worth it though, as I sip my BLUE BALLS -N- SAGE, and revel in the healthyness. blueberries are a diuretic, loaded with flavonoids and [...]

  138. benz Says:

    Hello Alan,thanx 4 the project,and 4 all the answers you gave-read them all
    i came via hackaday,but i’m looking 4 a similar circuit in which a microphone is the ”switch”
    as i’m not that good at …tronics
    what i mean is that when a mike pics a sound it triggers the transistorwhich switches
    on the led…
    might need an opamp to amplify the signal?
    if you could help me with the schematics,i’d …

  139. Richard Rigginbottom Says:

    Yo dudes

    I love your funky ideas on lights
    they are rather rivetting and enjoyable to the eye
    keep reaching for the stars!

  140. Mr. Kruz Says:

    Hey Alan,
    Cool Bawls hack! I used to drink sooo much of those things when I worked at Office Depot’s corporate office that I had a cubicle built out of them(figuratively)…but hey, there was another hack that you did which was the ‘create your own embroidery machine”, but hacked gadgets took it down I think, because it’s no longer there. Do you still have it, and if so, could you repost it or email it to me? That would be awesome if you could! Thanks, and keep the hacks coming!!

  141. Alan Parekh Says:

    Hi Kruz,

    Sounds like a cool cube. :) The article is here http://hackedgadgets.com/2006/04/07/diy-computerized-embroidery/ but it looks like the site that was linked to is gone…

  142. Light Sensitive LEDs | Hack N Mod Says:

    [...] the LED is off. When the lights are off, the LED turns on, and lights up your case, lights, etc. Simple but oh so much fun. In this case, a Bawls Blue bottle was used as a lamp for this project. [...]

  143. Hank Says:

    Hey, i have a 12V battery and 12V led panel. I was wondering if someone knows what transitor and what riesitors i would need to use for this setup? Im trying to set up my greenhouse so the light automatically comes on during night. Any help?

  144. prajesh Says:

    hi i m prajesh in electrical engineering sudent. please give me a parts and their photos
    of smart continuity tester> your faith fully,

  145. Matt Says:

    I’m trying to do this project, but the 9v battery won’t fit into the top of the bottle. I looked at your pictures, and my bottle is different than yours. It says 296 ml and 10 fl. oz. I can’t find any bottles like the ones in your pictures. Do you know of anywhere to get those style bottles from?

  146. Alan Parekh Says:

    Hi Matt,

    The battery is actually outside the bottle. It is hanging in the back.

  147. Bawls Blue Crystal LED Light - Hacked Gadgets - DIY Tech Blog Says:

    [...] The Bawls Blue Crystal LED Light project that reminds me of my Bawls project. [...]

  148. Steffen Says:

    Hi alan
    Nice hack :). It gets a high rating in the fun-factor for $$$ category :).

    I’m planning to use this in various applications so I have some questions.

    1. Is the 100Kohm resistor the max value needed for any voltage and LDR, i.e. can a buy a variable 100K pot to allow adjustment for different voltages and LDRs?
    Or should I buy a 200K pot if I want to use it with 3v and 12v for example? Plan to use the pot to pinpoint the fixed value needed.
    I have this LDR http://dk.farnell.com/eg-g-vactec/vt90n2/ldr-series-vt900/dp/1652637 and this http://dk.farnell.com/eg-g-vactec/vt935g/ldr-series-vt901/dp/1652638

    2. I presume that you just get the resistor value for the LED by the normal (Vin-Vused in LED)/A used by LED?

    3. Is the middle leg always B and then you can just swap outer legs if it brightens instead of dims when light?

  149. Alan Parekh Says:

    Hi Steffen,

    There are lots of different LDR devices, I think the ones that I used go to about 1M ohm when in complete darkness. If you got a 1M pot you could find the sweet spot for your needs. The base is usually the center pin but this is not always the case. If you flip the 100K resistor and LRD around that will change the way it reacts to light.

  150. steve Says:

    nice project ….can any one send me its details like circuit diagram and components required…

    thanks in advance,,,,,

  151. Alan Parekh Says:

    Hi Steve,

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

  152. 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 [...]

  153. 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.

  154. Alan Parekh Says:

    Hi Contraman,

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

  155. 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!

  156. laxmi sah Says:

    Hey guys,
    plz give me a circuit

  157. Alan Parekh Says:

    Hi Laxmi,

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

  158. Luiz Says:


  159. 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

  160. Don Says:

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

  161. 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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