Instructables
Picture of Nightlight led laptop from USB
This instructable arises from the need to illuminate the keyboard of the laptop without having to move the display to retrieve some light when working with your computer at night and without other lights on. I have plastic that is lightweight and does not risk of crawl the homes of the laptop.
 
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Step 1: The materials

The material that I used can be seen in figure is two different plastic profiles referred one "L" and a "H", the 4 white LEDs (beam of 20 °, voltage 3.7 v), limiting resistors (not present in the figure), the plug USB and other things of easy availability.

Step 2: Support

To dock the lamp to computer I used L profiles that shaped and equipped whid Velcro parches in the inside have formed a kind of kalipe.
To understand the distance between the two faces I had to make some provisional tests up to get the right size.
I pasted the pieces together, after establishing the right position, with  cianoacrylic glue.
 

kris754a11 months ago
it's a very nice idea,i think i will try make something like this :-)
Kalibar073 years ago
how about a way to actually install the LED's into the case of the laptop so that they are completely integrated into the system...?? would make keeping your laptop clean and organized rather than having a bunch of stuff attached to it.. just an idea
Broom Kalibar072 years ago
I've been "inside" laptops, and I gotta say: there is NO spare room inside. The engineering that goes on to make room for the video and mechanical connections through the hinge are immense; embedding LEDs there is pretty much right out.

There might be room for flush-mount LEDs at the top, but I think the easiest solution would be a permanently mounted "lip" at the top. You'd have to make sure it didn't interfere with the latch, of course, and you'd want to leave clearance for any front connectors (smart cards, microphone, whatever) that your laptop has.
torx (author)  Kalibar073 years ago
It would be a good idea actually; the fact is that it's not on my scope because of my limited technical knowledge.Thanks to the stimulus Kalibar.
Considers, finally, that you cannot change any equipment without seeing its decay.
SharpyWarpy3 years ago
Just to let you know I built the light and I'm enjoying it. I made mine a bit differently than yours. Instead of the H channel and L shaped plastic I used chloroplast. I used blue LEDs, 7 of them. I calculated my resistors for the LEDS for 10mA of current so the light would be very subdued and the bulbs will last a long time. I have attached some pictures. The first is without ambient light or flash. Picture 2 is with ambient light, a reading light fastened to the head of the bed. You can see the reflection of the reading light on the laptop screen. Picture 3 is without ambient light or flash. Last picture shows under the hood. I hot glued all the connections of the chloroplast. I did not build an H channel, I glued the piece containing the LEDs directly to the front bracket. The assembly wanted to flop forward because of course it's front heavy and also because there's a bit of a drop off -- a curvature -- on the back of the screen. I solved that problem by applying a thick bead of hot glue to the rear inside corner of the rear bracket and positioned it onto the top of the screen where I had put a piece of aluminium foil to prevent the glue from contacting the computer. After about an hour I removed the foil and had a almost perfectly conformed bracket that did not tip. Thanks again, torx for the terrific instructable.
pic_1.jpgpic_2.jpgpic_3.jpgpic_4.jpg
torx (author)  SharpyWarpy3 years ago
I like very much, the light is strong and has a very nice!! You think that you can publish it as a proper instructable?I think it is very interesting and practical. About the issue of supply current of leds I think you've done very well to stay low because I did experience to burn my white leds powered 20ma.
Excellent work Sharpy.
SharpyWarpy3 years ago
Well done, torx. Congratulations on what appears to me the best design I've seen yet for this problem. A very worthwhile project of which I will most certainly make good use. I like that it is removable so the laptop retains it's portability. I am truly inspired and I thank you for sharing this with everyone.
torx (author)  SharpyWarpy3 years ago
Thanks, I'm glad you like it, and I'm happy to have shared with you this construction.
Welcome to instructables and happy new year!
Is possible to add a dimmer switch to lower the amount of light?
torx (author)  missourimanwphc4 years ago
This thing is certainly feasible and would be a touch of finesse that would certainly, If someone on the NET will suggest a solution for this circuit will be appreciated, because I couldn't do anything but put a trimmer resistive that place in series to the circuit, increases the resistance value of limitation thereby to the current total. Thank you Missouriman...
Solderguy4 years ago
This is probably the most useful thing ever. If you add a switch you could turn it on and off without having to plug and unplug it.
torx (author)  Solderguy4 years ago
Thanks for the praise Solderguy. About the switch I will support and it was my intention to do it, then instead, due to some difficulties in terms of feasibility from me encountered I preferred to do one thing easier. Thanks again.