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The Girlfriend Nightlight

The Girlfriend Nightlight
I first came up with the idea for the Girlfriend Nightlight when my significant other
revealed that she was afraid of the dark and couldn't sleep without the television on. 
Being easily distracted, I can't sleep when the television is on.  After several disagreements, she proposed that we purchase some kind of a nightlight.  I inquired what kind of a nightlight she had in mind, to which she replied that it would be extremely cool if I could find a blue one.

 Find?  Possibly.  Invent?  Oh yes.  Several days later, I showed up with the prototype Girlfriend Nightlight, and she absolutely loved it.   It does an excellent job of permeating a room with just the right amount of atmospheric blue light, draws plenty of interest at parties, and ended all disagreements about sleeping with the television on. 

 My girlfriend also thereafter swore that I was some kind of genius.  The truth is that after selecting all of the electronics and materials, assembling the Girlfriend Nightlight is pretty straightforward.  I built the first one in a few nights' worth of spare time... and so can you.
 
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Step 1A few things before getting started...

Let's begin by listing a few things you want to do before getting started.

 1.) I'll assume that you know how to solder, and that you have a basic understanding of electrical circuits as well as a basic understanding of electronic components.  You shouldn't need to thoroughly understand the physics going on inside a resistor or a capacitor or be able to recite the mathematical formulae that govern their use, but you should have a concept of what these things are and what they do.  If you're starting with electronics for the very first time, this is a great project for you to try to build, but may I suggest you begin by first reading Sparkfun Electronics' excellent “Beginning Embedded Electronics” tutorial at:
http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=57

 2.) You'll want to make sure that you have a clean, well-lit space to spread out and build your nightlight. 

 3.) You'll need some basic tools - a pair of wire strippers, a pair of pliers, a small philips screwdriver, an electric drill, a simple multimeter, and a good soldering iron.  I've built this nightlight using a cheap nine-dollar hobbyist soldering iron as well as a spectacular variable-temperature soldering iron.  Trust me, it makes a massive difference.

 4.) While this project could very easily be built using one single spool of wire, I'd strongly recommend using two different colors of wire.  I used red wire for anything having a positive charge, and black wire for anything connected to ground.  It is massively helpful to be able to look at all of the wires in your circuitry and be able to tell at a glance which wires are ground and which wires are not.  Getting into this habit now will serve you well when you advance to more elaborate and complex electronics projects.


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87 comments
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Feb 13, 2012. 9:27 AMcharger25 says:
Nice led watch buy in Ukraine
Mar 4, 2011. 1:38 PMfelixh says:
I have a question could one not use a potentiometer instead of a fixed resister where the 47 ohm is that way if you wanted it brighter for like a actual lamp or something like that?
Nov 11, 2010. 11:27 AMtomx63 says:
well done! impressive finished project and really great instructable. terrific pictures and thorough explanations.
wish i had a third arm to give you three thumbs up.
Mar 13, 2010. 11:49 PMstackerjack says:
Hi,
Connecting 2 holes together by means of solder may dramatically shorten the life of the components, as they will get extremely hot.
A wire link would be better, soldered in place at the same time as the original component. Apart from that, it looks good.
Jun 19, 2010. 3:07 PMdagenius says:
Most components are actually very tolerant to heat. with most of them, you can apply the heat of a soldering iron for more than 10 seconds without doing any damage. That is the whole point of commercially available components--so they can hold up to abuse from less experienced people. Although if you are really that paranoid, then wires work too. Pre-fabricated PCBs are even better.
Mar 12, 2010. 11:25 AMMurdoc222 says:
this is a great instructable. I had a little idea on how to improve your design, at first glance i thought that the lights were spinning. And i think that if you could some how get the motor that spins a disk in a cd player and somehow attatch it to the build, it would make the light so much better.
Apr 10, 2010. 12:47 PMCheeseduck says:
Um... I may be wrong, but wouldn't the light reflected off a spinning disc be almost identical to that of a stationary disc? In order to make the "disco" effects it would have to be made up of little mirrors all pointing in slightly different directions.
Apr 15, 2010. 6:10 AMkarnold70 says:
And also, if you used different sized and angled mirrors, you would simulate the 'flicker' of the TV. I have a similar gripe with my girlfirend, and this is going to get made as soon as I get the components. Awesome Instructible.
Oct 21, 2010. 12:35 AMDIY-Guy says:
A flat spinning CD would reflect almost as perfectly as a flat non-spinning CD. But a distorted disc would introduce movement in the reflection.

A few methods borrowed from 1980's DIY laser light show projects come to mind.
1. Use the kindergarten "put a record in the oven and watch it melt a little bit" method.
2. Clear model cement applied to a CD in strips or dot patterns.
3. Heat gun.
4. Reflective foil tape bits here and there.
5. Find the old gold coated write-once CDs and pull some of the coating off with tape to make patterns.

Please kindly ignore the fact that CDs were not available in the early 1980's and these ideas are updated for the current day. :)
Apr 5, 2010. 7:34 PMZycro says:
Cool light! I also thought it would spin and was very interested to see how the refresh rate of the lights would compare to an LED TV!
Mar 19, 2010. 12:25 PMArticrox says:
 other than the stores you mentioned, is there any other store or page that i can get the protoboards?? because from the ones you mentioned the only one that has it is sparkfun and the shipping is 28.95 when the receipt is 10.65 
Feb 1, 2010. 5:37 AMkill-a-watt says:
I'm glad it's working for you, but even one fully lit blue LED will mess with my melatonin.  I've got three layers of tape over the one on my PC

Feb 6, 2010. 3:11 PMMr. Smart Kid says:

Let's see, i got a moderlety bright blue led on my laptop, a brighter blue led on my dvd player / sound system combo, one sorta dim neon glow lamp on my 10 gallon fish tank's heater (tank  has lot of guppys & 3 apple snails), another dim neon glow lamp on my 30 gallon tank 's heater (tank has more guppies & one, 7 inch long feeder goldfish named rudof  (1.5 years old), and a realy brite neon glow lamp on the heater for 1 gallon "kritter Keeper" tank  (as my guppy fry tank)


and to top is off,  i listen to an air pump, an air stone, a air powered box filter, and 2 hang on the back filters on my 30 gallon trickleing water from about 3 to 7 inches to the waters surface, and since i'm used to the noise, I have a hard time sleeping without it.

Mar 7, 2010. 7:05 AMkill-a-watt says:
Wait a few decades, Mr. Smart Kid.  Sufficient to say if I don't sleep well, I don't feel well, and my days of staying up to 4 AM, putting aluminium foil over my windows, and sleeping until noon are over.

Although the tank sounds might be nice. I use cat /dev/urandom > /dev/dsp & for white noise.
Feb 6, 2010. 3:19 PMMr. Smart Kid says:
P.S. great Job!!!
Feb 5, 2010. 11:51 PMmikeeve says:
Really good workmanship and writing. But, <killjoy alert>, there is some evidence suggesting night lights are not good for you, even increase risk of breast cancer. If you must have a night light, red is best, blue the worst!

Here's a link www.independent.co.uk/life-style/health-and-families/health-news/avoid-breast-cancer-sleep-in-the-dark-404522.html

Nonetheless, hope you keep the projects coming!
Feb 19, 2010. 4:09 PMJeffrey G C says:
this may sound like a dumb question, and i probly bought the wrong thing, but does the 10 mfd capacitor have to be polarized?
Feb 21, 2010. 11:12 AMelladan99 says:
great instructable! too bad there aren't any faceboxes/guideboxes on the pics though. i'm sure you got great love when she got this. i'm bookmarking this one.:)
Feb 13, 2010. 5:05 PMyeehacmh says:
I've always wanted to invent a light like this that emits random colors and brightness intensities. It would use very little power. When I would leave the house at night this light would fill the room with faux TV lighting and make people think that someone is home. It would be a cheap deterrent to burglars.
Feb 20, 2010. 8:46 PMyeehacmh says:
Hey, I found it.. Just stumbled upon it here..
http://www.stumbleupon.com/su/1cGCmi/www.thinkgeek.com/gadgets/
Feb 4, 2010. 10:17 AMProfessorJWN says:
This is one of the best instructables I have seen.

Great job!

BTW - this could also be used to make a pretty realistic looking Iron Man ARC reactor prop., or any other light for under counter cabinets, or even a bike light (if you lose the big cap, or make it switchable.

VERY VERY nice job!
Feb 16, 2010. 3:05 PMAdvocat says:
Thats the first thing I thought of too. Tell me, have she tried sticking it to your chest yet, and been acting kinda weird, and asking you to come back down to earth..? Be careful when you says shes kicking out the trash when there are other women around, especially blonde reporters who ask if you lose sleep at night. lol

You know, that was one of the most straightforward structables I have read in a long time, simple, well thought out and also well documented. 5 stars.
Feb 7, 2010. 12:25 AMTrelligan says:
   Triple threat:
 1) Gives clear explanation (not just what and how, but also why) in instructable, with lots of clear pictures.
 2) Takes constructive criticism and updates/corrects article.
 3) Gives good answers in comments.

   4 stars and subscribed.
   Keep writing!
Feb 4, 2010. 1:10 PMms_jane says:
I'm not sure I believe in the whole "blue light causes lack of sleep" study. All facts are subject to debate, especially when you consider that no scientific study can be entirely controlled. I mean, how do we know that the scientists who did the blue study weren't extremely good-looking, causing their amorous subjects to have sleepless nights?

Anyway, what a great instructable! What I'm most impressed by is your ability to creatively problem solve a relationship issue. Most people would have responded with anger and "Shaddup, woman. Whatchu need that dang television fer, anyway!" Five stars.
Feb 5, 2010. 1:12 AMdamaltor says:
a 7805 Voltage Regulator will not bring you 3.3V, but 5V.

are you sure that there should be a 7805 inserted here?
Feb 5, 2010. 10:18 AMdamaltor says:
Ok, that sounds good. but, at the output of the regulator, there will be 5V, no matter what leds are connected.
Feb 5, 2010. 11:34 AMspasysheep says:
And? as he said, the LEDs have a voltage drop of 3.2-3.4V, so he added the 27 Ohm resistors to drop the extra 1.6-1.8V. Then the 47Ohm resistor to drop a little bit more, so the LEDs weren't at full brightness. Just because the 7805 will always output 5V doesn't mean that there will always be 5V across anything connected to it.
Feb 5, 2010. 7:17 PMdaifeichu says:
damaltor is correct. 5V will be measured at the o/p of the regulator, not 3.3V. The 47 ohm resistor is going to drop it to about 3.3V. Not a big deal but someone who is just starting out might get confused when they don't measure 3.3V.

geosword, great project. I was suppose to get a night light for my daughter this weekend but I think I'm just going to make something like you did. Good job.
Feb 5, 2010. 12:17 PMdamaltor says:
Yeah. but it does mean that measuring directly at the output of the regulator (which is described in the text) will give a 5V reading.
Feb 4, 2010. 12:43 PMGoodhart says:
Now all you need is to have the LEDs flash in a circular pattern and you could wipe minds and reprogram them too....LOL

Star Trek episode:  Dagger of the Mind
 
Feb 5, 2010. 1:00 PMpiddle01 says:
Hahaha Beam me up Scotty.
It's Ironic that those words are actually never said in any movie, show, etc.
:]
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