Hello. I don't know if I positioned the topic correctly, but well. I have a USB cable from the A4 mouse something like that (I don't know the model because I already threw it away). Well, I want to make a USB lamp, but I have a problem with the cables inside the USB. There are small...

Take the LED, solder a 1k? resistor to it and connect it to two cables in various combinations, when it lights up, you found + and -

You can find more about the USB standard in the book Computer measuring systems by W. Nawrocki.

Only I don't have any gauge or other miracles. And the Usb type is A. I don't know much about electronics and I just want to make a laptop lamp to illuminate the keyboard in the evening ...

You can buy such a lamp ready, for example on the Allegro. The USB has a 5V power supply and has a current efficiency of 500mA from what I remember.

it has a minimum of 500mA, I was pulling over 1A but that depends on the motherboard.

1A to FireWire (IEEE 1394) nominally had. No. USB has a separate power supply so it's true, it depends on the mobo. But 500mA will run smoothly from USB.

So about these cables: where can + and where - be?

You have 4 wires in the USB cable: - live red is +, - black vein is -, - the rest is transfer. USB 2.0 500mA, USB 3.0 900mA. Both 5V.

Well, but he writes that I have 5 veins: blue, green, green - copper, blue - copper and copper. Well, my question is: Which is + and which is -.

Some USB connectors (mini-USB, etc.) have 5 pins (including wires). Four perform the primary function (power supply, ground and 2 differential signal cables), and the fifth is largely unused.

USB Cable Colors - Identifying Positive (+) and Negative (-) for A4 Mouse Cable DIY Lamp Project

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#1 9434255 24 Apr 2011 11:00

shadow1578 shadow1578

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Post #1
9434255 24 Apr 2011 11:00

Hello. I don't know if I positioned the topic correctly, but well.

I have a USB cable from the A4 mouse something like that (I don't know the model because I already threw it away). Well, I want to make a USB lamp, but I have a problem with the cables inside the USB. There are small cables of such colors: blue, green copper, green - copper and blue - copper. Which of them is + and which is -?
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#2 9434279 24 Apr 2011 11:15

ajpier ajpier

Level 36

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Post #2
9434279 24 Apr 2011 11:15

Measure yourself with a meter.
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#3 9434354 24 Apr 2011 11:45

lekto lekto

Level 35

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Post #3
9434354 24 Apr 2011 11:45

http://pl.wikipedia.org/wiki/Usb#Transmisja_elektryczna
#4 9434488 24 Apr 2011 12:27

Elektronik9 Elektronik9

Level 30

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Post #4
9434488 24 Apr 2011 12:27

You can find more about the USB standard in the book "Computer measuring systems" by W. Nawrocki.
http://www.wkl.com.pl/komputerowe-systemy-pomiarowe,1,1,169
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#5 9434532 24 Apr 2011 12:40

shadow1578 shadow1578

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Post #5
9434532 24 Apr 2011 12:40

Only I don't have any gauge or other miracles. And the Usb type is A. I don't know much about electronics and I just want to make a laptop lamp to illuminate the keyboard in the evening ...
#6 9434630 24 Apr 2011 13:05

Elektronik9 Elektronik9

Level 30

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Post #6
9434630 24 Apr 2011 13:05

You can buy such a lamp ready, for example on the Allegro. The USB has a 5V power supply and has a current efficiency of 500mA from what I remember.
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#7 9434645 24 Apr 2011 13:09

lekto lekto

Level 35

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Post #7
9434645 24 Apr 2011 13:09

it has a minimum of 500mA, I was pulling over 1A but that depends on the motherboard.
#8 9434675 24 Apr 2011 13:22

Elektronik9 Elektronik9

Level 30

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Post #8
9434675 24 Apr 2011 13:22

1A to FireWire (IEEE 1394) nominally had. No. USB has a separate power supply so it's true, it depends on the mobo. But 500mA will run smoothly from USB.
#9 9434967 24 Apr 2011 15:07

shadow1578 shadow1578

Level 10

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Post #9
9434967 24 Apr 2011 15:07

So about these cables: where can + and where - be?
#10 9435029 24 Apr 2011 15:32

MarekPPN MarekPPN

Level 35

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Post #10
9435029 24 Apr 2011 15:32

You have 4 wires in the USB cable:
- live red is +,
- black vein is -,
- the rest is transfer.

USB 2.0 500mA, USB 3.0 900mA. Both 5V.
#11 9435089 24 Apr 2011 15:57

shadow1578 shadow1578

Level 10

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Post #11
9435089 24 Apr 2011 15:57

Well, but he writes that I have 5 veins: blue, green, green - copper, blue - copper and copper. Well, my question is: Which is + and which is -.
#12 9435096 24 Apr 2011 16:02

Elektronik9 Elektronik9

Level 30

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Post #12
9435096 24 Apr 2011 16:02

Some USB connectors (mini-USB, etc.) have 5 pins (including wires). Four perform the primary function (power supply, ground and 2 differential signal cables), and the fifth is largely unused.
#13 9435111 24 Apr 2011 16:07

lekto lekto

Level 35

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Post #13
9435111 24 Apr 2011 16:07

or connected to a metal housing.
#14 9435161 24 Apr 2011 16:28

MarekPPN MarekPPN

Level 35

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Post #14
9435161 24 Apr 2011 16:28

Since you do not have a meter, you will not check it.
#15 9435163 24 Apr 2011 16:29

jankolo jankolo

Rest in Peace

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Post #15
9435163 24 Apr 2011 16:29

shadow1578 wrote:
Only I don't have any gauge or other miracles.

Then buy it, borrow it or go to someone who has such a miracle.

shadow1578 wrote:
I do not know anything about electronics and I just want to make a laptop lamp to illuminate the keyboard in the evening ...

I repeat the suggestion above: go to someone who has a gauge and an idea of what he will be doing. I warn you: you will damage your equipment. By the way: can you solder?
#16 9435271 24 Apr 2011 17:17

shadow1578 shadow1578

Level 10

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Post #16
9435271 24 Apr 2011 17:17

jankolo wrote:
I warn you: you will damage your equipment.

By the way: what should I damage myself? I only work on the cable.

jankolo wrote:
By the way: can you solder?

Yes I can.
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#17 9435689 24 Apr 2011 19:31

wlw_wl wlw_wl

Level 38

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Post #17
9435689 24 Apr 2011 19:31

Take the LED, solder a 1k? resistor to it and connect it to two cables in various combinations, when it lights up, you found + and -
#18 9435939 24 Apr 2011 20:47

jankolo jankolo

Rest in Peace

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Post #18
9435939 24 Apr 2011 20:47

All the necessary answers have already been given. I close the topic.
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Topic summary

The discussion revolves around identifying the positive (+) and negative (-) wires in a USB cable from an A4 mouse for a DIY lamp project. The user is uncertain about the color coding of the wires, which include blue, green, copper, and variations thereof. Responses suggest using a multimeter for accurate identification, but alternatives are provided for those without tools, such as connecting an LED with a resistor to test combinations until the correct polarity is found. The standard color coding for USB cables is mentioned, with red typically representing + and black representing -. However, the user notes the presence of five wires, leading to confusion about their functions. The conversation emphasizes caution to avoid damaging equipment during the DIY process.
Summary generated by the language model.