The backlight of the computer table from Yusb do it yourself. USB backlight for keyboard. Simple backlight for keyboard

Everyone knows that LED lighting as a decorative element has long eclipsed all sorts, lamps and neon lights. The diode unit is usually connected to the power stabilizer, which, in turn, takes energy from the outlet, converts it to the desired values \u200b\u200band directs straight into LEDs. A complex and confusing process, is not it? Someone can protest: "There is probably other methods of connecting the lamp, because if everything was so hard, the LEDs would not find such popularity that they boast now, because not every person wants to mess with this design , configure it and pay a lot of time to this process. " If you think so too, then you are right. Manufacturers have provided such a feature of behavior and invented a LED tape with a built-in USB seed.

USB LED tape

USB LED Tape - USB Speaker

Each at least charged the phone from the computer's USB port, because it is even more convenient if you compare with charging from the outlet. This fact shows that yusb contacts pass the current that can be applied to functioning diode light bulbs. The usual USB connector in modern devices version 2.0. It has 4 contacts, half of which serve to transfer data, and the other half is designed to power the connected electrical appliance.

Read more with a USB 2.0 pinout using this picture:

USB LED Tape - Operation Principle

The average stability of the USB connector loads is 500 mA by current and 5 volts voltage. Such parameters allow you to connect a whole strip from low-current LED bulbs to port.

The most important detail of the collected design is not the LED tape itself, as many people might have thought, and the USB connector, because without it, your device will remain a conventional illuminator, feeding the voltage from the outlet. The connector can be bought at any store of electric goods or use the old and unnecessary. Think carefully, you have, for example, a charger from a broken phone, which you do not use 3 years. Why it will lie without a case if you can transform your workplace with it. Calculate the length of the cable, taking into account the distance between the system unit and the place of installation of future lighting. If we are talking about stationary computers, an additional USB port is built in some keyboard models, which is perfect for the organization of diode illumination. If we are talking about a laptop, it goes without saying: the connector is also located on the side of the device.

USB LED Tape - Connection Scheme

To implement the connection of one LED, you need a response part of the USB connector, a two-housing cable, a resistor and a diode light bulb that can brightly shine (SMD5050 is perfect). If you bought a USB connector separately, disassemble it, free the inside on which the contacts are located to be easier to solder. Deciding with the LED Type, calculate the resistance of the resistor. This can be done with this formula: R \u003d (U PIT -U LED) / I LED, where:

R - resistance;
U Pit - supply voltage emanating from the USB connector;
U LED - direct diode voltage, depending on the shade of illumination;
I LED - nominal diode working current.

USB LED Tape Connection Scheme

After the calculation, it will only be left to solder all the necessary components among themselves and decorate the backlight, remove the tracks of the soldering, bring it into a normal look. First of all, you take the plump and shorten the plus output of the diode, then the resistor is soldered to this withdrawal. The next step will be a soldering of one wire to the free output of the resistor, and the second to the output of the diode with the marking "-". Under the heat shrink tube, hide the conclusions, resistors, installation sites and soldering. To make a decent appearance of the design, both cables near the LED light bulb are enveloped to the thermal tube, it is advisable to find a tube of a larger diameter than the wires. The terminals of the disassembled USB connector solder the connecting wire from the reverse side. The cable that comes from the resistors needs to be connected to the first + 5V terminal, and the cable that goes from the minus of the LED, - with the fourth GND terminal. After soldering, check that there are no closures with terminals at number 2 and 3 and collect the connector.

USB LED tape and where to apply it

USB LED tape. Many such a process seems difficult and difficult, so it is easier to choose another path. The stationary computer power supply displays the optimal voltage 12 V, which is present on the 4-wire MEX connector inside the system unit. You will need to purchase a retaliatory part of the peak with pins and attach to it and to the diode strip the power cable of the required size, which is displayed through the rear side of the system unit. Plus, the USB LED tape is connected to a yellow-colored milestone, and "minus" - with a free wire of black.

Useful homemade, which must be useful to you almost anywhere where there is a USB:

Houses for backlighting: you can connect at least to a computer, at least to a laptop.
In the campaign, fishing or hunting: you can connect to an external battery (Power Bank) and the lighting in a tent or on the street is already ready!
In the backlight car: now there is a USB input in each radio. If you make a wire, then you can use as a mobile viewing lamp at all.
There are no few other applications.

USB wire from any unnecessary charge.
A pair of 5-500 ohm resistance - resistance depends on the brightness of the luminous luminosity.
Non-working LED light bulb at 220 V.

We disassemble the light bulb. To do this, you need to pry a flat screwdriver white dome. It is glued and must gradually move away from your pressure.

We remove the inner fee, we will no longer need it, we will have her own.

We make a hole in the crook for the wire with a hot soldering iron. You can simply drill a drill.

We skip the wire to power the bulb.

We now need to collect a very simple scheme for powering LEDs from USB - 5 V.

We do everything on a piece of plastic. I have a small brightness, but if you want a grig - to do everything you need on an aluminum piece of metal. For better heat removal from LEDs. Resistance to resistors can also be adjusted and the power of the luminosity of the LEDs, which means their heating.

We glue our collected fee to the light. Glue on hot glue.

Now we collect a light bulb. Glass can be glued to super glue.

This is what the ready-made lamp with USB.

But how to glow. Practically, as shone earlier, when he worked from 220 V. LEDs, you can take more and more in quantity. But in this case, it will increase the consumption current, which can affect the USB load. I made an optimal option.

After the USB backlight purchased in the keyboard is broken on the first day of use, I decided to make my own. To do this, you will need:
1) USB plug on type A nest
2) LED
3) Resistor
4) telephone cable TRP
5) soldering iron, solder, rosin
6) scissors or knife
7) Proven tool (pliers)

USB plug We will need to feed meals from USB output. There are several types of USB outputs, most computers use the type A. Type of these outputs can be viewed or. I bought a USB plug in the store, because he looked like this:

To a white thing on the side that will be inside, you need to solder telephone wires.
Pre-from the cable you need to cut off a piece of cable you need the length, then cut in half (the cable is two-housing) and clean from excess insulation. The edges of the resulting wires should be cleaned from the insulation completely, gently cut through the insulation to the wire around it and removing. Then, one wire should be trimmed by 1-1.5 centimeters - a resistor will be soldered to it. Sliced \u200b\u200bends of the wires solder to extreme pins of the USB plug, these are feeding outputs, medium pins closure with each other with a small solder lump, these are differential informational outputs.
In order to solder, you need to preheat the soldering iron, turning it on the network, then (after 10-15 minutes) melt a bit of rosin, then solder, pick up a solder drop to a soldering iron and apply to the previously soldered surfaces.
To test the multimeter in the call mode, whether you were not closed "extra" pins - closed only PIN 2 C 3. By the links above, you should also view the polarity of Pins, and mark the wires from both ends so that you can clearly Where there is a positive potential where negative.
Then we insert a white piece in the piece of iron, plug by the second piece, the pliers crimp the location of the wires so that the USB plug cannot be gaining.
Light-emitting diode I bought in the store. I would choose a bright or ultrayar LED, the light of the light is at least 5 Kande. Color to your taste, I chose blue. We should remember and note the parameters of LEDs, such as their operating voltage and current. The LED should be connected taking into account the polarity - the cathode to the positive potential, the anode to the negative. View polarity in this picture: As can be seen, a shorter output is a cathode, a long - anode. You can also look at the light as facing the lights in the LED, compare with the picture and find out the polarity.
Select a resistor. The resistor performs a very important role - it limits the current so that the LED is not burned. The voltage on USB output is standard and stable (independent of current) - 5 volts, the current may vary from 0 to 500 milliam. In theory, if the LED has a working voltage U, then we need the remaining voltage 5-U to fall on the resistor, and the current was working for the LED (we connect the LED sequentially to USB output). So to connect an LED with an operating voltage U<5В и током I<500мА нужен ограничивающий резистор номиналом (5-U) / I. For example, my LED consumes 3.5 V and 0.02 mA, which means I took the resistor on (5-3.5) /0.02\u003d75 Ohm. However, specifically, such a resistor in the store may not be - then it is necessary to take the first resistor, close to the nominal to settlement, but more so that the current of the LED does not exceed the nominal and the LED has not burned. Of course, you should not take, for example, 100 Ohm instead of 75, it is desirable that the resistance deviation does not exceed 10% of the calculated one. And do not take ceramic resistors instead of ordinary - they are very overall.
If you have old resistors, you can draw their nominal with a multimeter, or try to determine the range of color labels - with this table:
So, after soldering the resistor to the short end of the wire, and the switching of the LED (with the observance of polarity) can be connected to USB backlight. If the LED began to shine - it means everything is fine, if he did not catch fire, he was very hot and a member of Gary appeared after some time - it means you mixed up the polarity and the LED burned down. If the LED does not burn, and the smell of Gary is not, then, most likely, you closed the informational PIN with power, or did not block them between themselves - you can reveal the plug and repaid again.
As a result, it turns out this design:

The cost of this design was only 29 rubles, given the costs of details without taking into account the costs of transport parts, buying a toolkit.
In the dark, shines not bad (7 Candell), the eyes do not blind, but the letters on the keyboard can be seen.

Tags: electronics, love

Now the housewarming is not celebrated. The tradition is lost. And before guests were invited. Guests came with gifts, including chandelier. To buy a chandelier was difficult, they were released too little. Now it is difficult to buy any lighting device, they are released too much - the eyes scatter from the range. And when all design projects were implemented, and there were no loose sockets in the houses of citizens, found from among the advanced who showed the finger on computer sockets. So a new commercial niche appeared. Niche LED.

I bought such as a future souvenir, for a lovers of communicating with a netbook. Its full name "FLARX USB LED lamp." There is not much information on the package, but it is enough to determine the choice. Composition: polystyrene, steel. LED service life: 10,000 hours (which is impressive).

An openwork reflector in the form of flower petals immediately impressive, its diameter is 85 mm, the total length of the lamp is 350 mm, the thickness of the flexible element is 5 mm, the USB plug is standard. Looks beautiful. However, it becomes immediately clear that thin petals of the plexiglass will be fond of long.

In terms of overall dimensions, the lamp in a general view with a netbook fit, in terms of design, it is not very, it is definitely definitely not. The glow of the LED is so weak that with additional lighting it is generally impossible to see. The verdict is simple - you need to do something.

Remove the reflector with the help of the effort of the fingertips did not work, it was called to the aid, a hacksaw blade was called, which made the circular cut into the holder. After that, he was safely disconnected from the flexible element. The LED itself and its resistor, the current limiter appeared. The resistor resistance was set to measurement - 58 ohms. The output is simple - it is necessary to reduce. The petals of the reflector were glued and starred from his lenses freely. The diameter of the spherical light scattering lens, as made of organic glass, 24 mm.

New Electrical Lamp Scheme

For a free end of the flexible element, a certain suitable part of the plastic element was dressed, designed to continue to perform the role of the base for fastening the variable resistor. A permanent resistor, as an element of the scheme, was left, but its nominal was reduced to 23 ohms. In the side bouncing of the lens fastenings, a hole with a diameter of 2 mm was drilled through which the wires with a variable resistor are passed to regulate the light flux force.

With the overall resistance of restrictive resistors in 493 ohms (alternating 470 Ohm and permanent 23 Ohms), the current for the LED is 4.3 mA. We get the minimum possible power of the light stream. When the variable resistor is turned into "zero" and, accordingly, only the resistance of a constant resistor at 23 ohm current on the LED is 47.3 mA. This is the maximum power of the light flux. Well, "Truth" is the best ratio of the load on the LED and the illumination will be somewhere in the middle.

The base for fastening the LED hollow, to drill holes in it, skip the wires in them, and then fasten to the variable resistor, it did not make much difficulty, as to install the resulting regulator on the place. The internal cavity filled with glue "Titan". In the conclusion, a certain similarity of the lampsier, reflecting the abilities, not, was made, but he would save his eyes from unnecessary light.

The backlight of the keyboard in the case: in the room during day lighting and in the dark room. Included on the maximum brightness, it is possible and reduced to the norm.

It is also clear now that, if necessary, a netbook with such lighting of the keyboard can be fully operated in this way. The beauty of the product was undoubtedly diverted, but it became functionally suitable for designed work. In general, with the purchase of this particular model, at one time hurried, now they appeared more suitable for the lighting function of the keyboard. Review made Babay Iz Barnaula..

Discuss an article USB lamp for keyboard backlight

At the moment, the market offers many options for organizing the lighting of a place behind a computer or a working area near it. As one of the most optimal - these are LED ribbons, the power supply of which is carried out from the USB connector. In this article we will analyze what LED tapes can be connected to the USB port, connection schemes, some nuances and features. We will also consider the LED feeding technology directly from the power supply of the computer.

For what to connect the LED ribbon to the computer

In the location zone of computer equipment, it is often necessary to install additional lighting. For example, not to use the main lighting of the room. It can interfere with other family members when using a computer in the dark. Or disconnect for savings. Lights from the monitor may not be enough. Also, the presence of background illumination facilitates eye load when working on a PC.

USB illumination version of the system unit itself

Backlight of the computer's workplace LED ribbon

Power supply LED tape from PC allows you to solve these problems. Installation of tape is possible at any location and for performing various functions:

background lighting monitor;
keyboard backlight;
additional lighting of the working area.
decorative design of a table or interior room.

Putting the tape is possible via a USB output or from directly from the computer's BP. The use of such power sources is eliminated:

stretching additional wires that are always abundant and they are often confused;
build a place in the outlet, which is also not enough, especially if there is additional office equipment.

Using the USB LED tape saves power consumption, as the tape takes a bit - up to 5 W.

What LED ribbons can be connected to a PC via USB

At the output in the USB port of the computer, the voltage level is not high (up to 5 volts). Options for connecting mostly two:

Connecting the finished LED tape model with a built-in converter and a USB plug. Such a factory tape implies the voltage at the input 5 V, for operation it is necessary to simply connect it to the USB port.
The second option is the assembly of the circuit using the LED tape 12 V and the voltage level converter from 5 V at 12 V.

Also LED ribbons connected to USB port are divided by radiated color:

- Monochrome - radiates white permanent light;
- RGB or tricolor - emits three main colors, red, green and blue.

Connection features

Connecting the LED ribbon via USB port is carried out in case of impossibility or reluctance to climb inside the computer, as well as when using a laptop. When assembling the scheme, it is necessary to consider that a voltage level is needed to feed the tape - 12 V. To do this, you need to make or buy in the radio component store already the ready-made voltage converter from 5 to 12 V.

It is worth considering that the USB port gives no more than 500 mA. When introducing a transducer into a circuit, the current is reduced to 200 mA. Therefore, you should use the LED tape with such or smaller parameters according to the strength of the current.

To assemble the converter, you can use the factory PWM - the controller, for example LM2577, this will reduce the number of parts of the converter. The following parts are also needed according to the scheme: USB plug, connecting cord.

Converter scheme:

This scheme is considered universal, and makes it possible to obtain the desired voltage at the output. Its parameters depend on resistors R1 and R2. As a result, a latitude and pulse converter is obtained. The capacitance of capacitors at the input and power output must be in the interval indicated in the diagram. These capacitors are designed to smooth constant voltage ripples.

The resistor and the condenser at the output 1 are frequency chain. Their parameters must be observed clearly according to the scheme. The inductance of the coil between points 4 and 5 should be clearly 100 μH. Special conditions must match the diode. It must have high speed, and besides a slight decrease in voltage at the transition. The perfect version of the high-frequency diode Schottky. The diode brand is not much important, since in this scheme a slight level of voltage and current.

Next you need to connect wires and USB connector. To do this, it is convenient to use the collapsible USB plug. It has 4 contacts. To connect, only two are needed along the edges that are powered. Their polarity can be determined by any device for measuring voltage by connecting the plug into the socket.

The scheme is mounted on a printed circuit board of foil glassstolite, and as a result, the device has about such an appearance:

Ready power converter for LED tape connected to a computer

With certain skills and knowledge, it is not difficult to collect a similar scheme. The most important thing clearly to follow and observe the location of the details.

Connecting LED Tape from PC Power Supply

The technology of connection from the PC power supply is slightly simpler than the previous method. With such a connection, it is not necessary to break the warranty seal on the BP and disassemble it. Almost every BP is equipped with additional connectors. Wires may be like:

Personal computer power connectors. In our case, use 1 or 2 options.

To attach the LED ribbon, connectors 1 and 2 types are suitable. The first serves to connect already practically not used "Flopic" for a floppy disk. Number 2 for connecting hard drive and CD / DVD-ROM. Both connectors have a 12 volt yield, and they are available for use. For the connection you need black and yellow wires. Black is minus.

The connection technique is extremely simple, the necessary wires are disconnected from the selected connector or simply binds and are soldered to the LED tape in compliance with polarity. But in the future it is impossible to connect anything to this connector.

If the connector is planned to use or simply do not want to break the chain, you can buy an adapter, and trim the wires on it.

BP adapter that is suitable for connecting LED tape. Only two wires need to use, the rest need to be insulated.

BP of modern computers are quite powerful and you can connect LED ribbons to several meters long. Data on power and current strength are indicated on the BP itself. In most cases there is always a power supply that can be used to connect the LED tape.

When calculating the length of the ribbon, the following table will help, since it is not always on the tapes there is information about the expendable load.

The table is very useful when calculating the length of the connected LED ribbon to the computer

Approximate calculation of the length of the tape. If the power supply has a stream of current 4 or more ampere, you can safely connect the SMD 3528 tape with a density of 120 diodes per meter 4 meters long or 3 meter SMD 5050 with a density of 60 diodes.

Like the length and type of tape when connected from USB port.

Ready solutions

For those who do not want or just a little familiar with the world of electronics, the modern market offers many ready-made variants of the LED tapes connected to the USB port. Externally, they may differ, but in general they work according to one principle. Examples of ready-made solutions:

First Option - RGB LED Tape Connected to USB Port

The second option is a single-color LED tape for connecting to a computer via USB port

The first option is a RGB tape with a connected RGB converter. The set is the control panel, which allows you to adjust the brightness of the colors and their shades. The second option is a monochrome LED tape with a length of 30 cm. Both options are simply connected to the USB port and do not require additional devices.

LED tape connected to USB port, a good option for organizing lighting near the computer. Its use allows you to save on electricity consumption, it does not take up much space, such as a table lamp. The technology of connecting the LED tape to the computer as a whole is simple and does not require serious cash investments. In addition, there are many already collected models that are just enough to connect to the USB port.