Introduction: 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.

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.

Step 3: The Circuit

I then occupied the fixture. To host the leds in the profile to "H" I ran 4 holes from 5.5 mm. Since my connecting to "H" was approximately 35 cm I calculated that the step between an led and another was to be 9 cm and two trailing spaces of 4 cm.
After doing this, I inserted the leds from the back until they are blocked when the wheel base led met the hole
As regards the electrical circuit is elementary because all LEDs are connected to the USB socket 5v through a resistor of limitation that I calculated should be 100 ohm, i.e. each led his strength and all circuits led-resistance are connected in parallel.
I dropped a drop of warm rubber above each diode to secure it, and to protect the contacts from short circuits.
Finally I asked a fuse in series to protect the circuit from a short circuit. I used a fuse from 160 milliamps because the current total should never exceed 100 milliamps for the load which is included; if this were to happen could short-circuit
and then it will be necessary for protection is active.

Step 4: The Hot Glue

After connecting among them all components, including the USB cable, (about this is useful to say, that the wires interested in 5V are red and black respectively + 5V and mass; as regards the other two wires are both connected electrically grounded to prevent the entry of radio disturbance induced by cable.) I "drowned out" the hot glue circuit several times to heat too the spinning plastic and then not to twist, leaving off the fuse with its contacts.
Of course you need to trim with a cutter glue when hardened.

Step 5:

After this phase I assembled the two pieces together. This stage requires a little attention in most because it depends on the right direction of the beam of light that must go to hit the keyboard so complete and regular.
This corner is found by assembling all in position and on seeing when you get a beam of light optimal and storing the corner. bear in mind that some fault tolerance can be accepted as a bit of adjustment you can obtain it by moving the screen support lane.
After having established the angle must be definitively set with a few drops of glue casting with precision angular cavity between the support and fitting.

Step 6: The Test

Here's how it works: it's very nice to the effect that is created and is not annoying for the screen.

Step 7: Painting

After masked with tape dedicated the area of light diffusion and the Interior support (the Velcro patches), I painted matt black acrylic color everything giving more hands intermixed to obtain a uniform coverage.Finally I ran a small hole in support to insert a band useful to block out the cable.
I forgot to mention that the fuse has been covered with rubber in order for a replacement

Step 8:

To conclude, I must say that I am satisfied with this realization, mainly for its practicality and utilities: And practice because once positioned must not be more regulated and does not move with the movements of the laptop; it is useful and I am even now while I'm writing: without it the keyboard would be dark seeds.
I think his aesthetic impact from off both be improved still somewhat when he lit it gives the best of himself. In the case that this instructable we both liked and please Vote For Me if you wish, I'll be happy! Every comment or suggestion will be welcome. Thanks for your attention, goodbye to the next...

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