Blue Bawls Automatic LED Light

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Introduction: Blue Bawls Automatic LED Light

About: You can see my blog here: http://hackedgadgets.com and my personal site here: http://alan-parekh.com

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 tried one the other day and thought the glass bottle could be used for something interesting. At first I was just going to stick an LED into it, but I wanted something a bit more interesting. So I threw together a quick and dirty circuit that uses a photo-cell to turn on a transistor which powers an LED. The parts should cost only 2 or 3 dollars, and are available almost anywhere.

Click here to see more PICTURES and a VIDEO of the Blue Bawls LED light
Here is a new schematic that allows for a On/Off/Auto switch

Step 1: Gather the Parts

Step 2: Breadboard the Circuit (if You Want to Test It)

Construct the circuit according to the schematic shown on the previous step.

Note: Depending on the photo-cell used the 100K resistor value might need to be changed. A pot could be used to determine the optimal resistor value.

Step 3: Solder It Together

The cap is used to hold the light in position. All of the parts will be connected to the cap. Three holes will have to be drilled in the top of the cap. Then solder the parts together according to the schematic shown on the previous step.

Step 4: Detailed Cap Construction - Prep. the Cap

There are two holes that are needed in the cap. One for the power and a second for the photo-cell. Since the photo-cell is large I simply drilled two holes side by side.

Step 5: Detailed Cap Construction - Solder Method Step 1

Trim both resistors to the length shown (it doesn't matter what end of the resistors are used). Solder both resistors to the red battery snap wire (positive).

The resistor values are represented by color bars, look here for pictires:
[http://alan-parekh.vstore.ca/product_info.php/cPath/12_13/products_id/52" target="_blank" 100K ohms Resistor]
[http://alan-parekh.vstore.ca/product_info.php/cPath/12_13/products_id/40" target="_blank" 470 ohms Resistor]

Step 6: Detailed Cap Construction - Solder Method Step 2

Solder the 470 ohm resistor to the anode of the LED (non flat side).

Step 7: Detailed Cap Construction - Solder Method Step 3

Connect cathode of LED (flat side) to the collector (C) of the transistor.

Step 8: Detailed Cap Construction - Solder Method Step 4

Install photo-cell.

Step 9: Detailed Cap Construction - Solder Method Step 5

Solder the base of the transistor to the 100K ohm resistor and to the photo-cell.

Step 10: Detailed Cap Construction - Solder Method Step 6

Make ground connection (Battery negative wire)

Step 11: Detailed Cap Construction - Solder Method Step 7

Test it to see if it works.

Step 12: Detailed Cap Construction - Solder Method Step 8

Protect the circuit using some hot glue.

Step 13: Detailed Cap Construction - Solder Method Step 8

Stick the light on a bottle!

Step 14: Non Solder Method to Follow

There are connectors that can be used if you don't want to solder the light together. Non solder construction details will be posted later.

Have a look at them here
http://alan-parekh.vstore.ca/product_info.php/cPath/10/products_id/46

Step 15: Attach the Cap and Have FUN!

Screw the cap onto the bottle, connect the battery and turn the room lights off. The bottle should start to glow. Turn the room lights on and the bottle light should turn off.

Click here to see more PICTURES and a VIDEO of the Blue Bawls LED light
Here is a new schematic that allows for a On/Off/Auto switch

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    182 Comments

    0
    JamesNg
    JamesNg

    14 years ago

    I have tryed to use a Lithium Battery(CR2025,3V) to replace the 9V "BIG BATTERY". And,the 470ohm should be drop out.i think that the Lithium Battery may hide under the cap.

    IMG_2167.jpgIMG_2168.jpg
    0
    JpU2
    JpU2

    Reply 5 years ago

    would it work using 2 LEDs

    0
    p2man
    p2man

    Reply 9 years ago on Introduction

    Hi James, could you post a schematic of this please? Here is a picture of mine.

    0
    JamesNg
    JamesNg

    Reply 13 years ago on Introduction

    =.=a
    Sorry
    I Don't know.
    I just have tried the demo only.

    0
    Illuminati
    Illuminati

    Reply 14 years ago on Introduction

    what resistor did you use between the transistor and the photocell???

    0
    JamesNg
    JamesNg

    Reply 14 years ago on Introduction

    I have tryed to use a Lithium Battery(CR2025,3V) to replace the 9V "BIG BATTERY". And,the 470ohm should be drop out....

    of coz it depends on your photocell supply voltage and the LED working voltage range.

    0
    sokbok
    sokbok

    8 years ago on Introduction

    im only using 3.7 V Battery, what might the 100K resistor value be changed to ?

    0
    wilbs719
    wilbs719

    Reply 7 years ago on Introduction

    try using a trim pot to get the desired performance while still on the breadboard, then measure the trim pot's resistance with your ohm-meter. Then solder in that value resistor. No Muss - No Fuss

    0
    p2man
    p2man

    9 years ago on Introduction

    I did the same exact thing, but my LED is really dim. Any idea what could be wrong? I've progressed from it not working at all to the point there is dim light! :)

    0
    alachance2010

    Hi, I wired my thing the way the schematic said and my light stays on, and gets righter with more light.. PLEASE HELP

    0
    tomx63
    tomx63

    11 years ago on Introduction

    This thread was an example example!

    nightlight_LED.JPG
    0
    demonstech
    demonstech

    Reply 11 years ago on Introduction

    I tried this one actually was pretty interesting. But wasn't succesful, when lI off the light the photocell light gets off and when light falls on photocell it glows. It became reverse :-P what should i DO ????/ plz do help :-(

    0
    tomx63
    tomx63

    Reply 11 years ago on Introduction

    post what you've got set up. i'll be glad to take a look at it to see if i can help. i'm an electronics newbie, but this is a very straight foward circuit and shouldn't be too difficult to troubleshoot.