USB Coil Cable

how do you know which colors go to what?
also does it work with two different usb cables?

thanks! =)

I am definitley trying this tonight with a 3foot usb cable, and creating a 15foot, using cat5. ohhh yeah, theres just nowhere for a printer when you got 2pcs on a dresser!

Thanks!! this helps the cheap committee!

Great idea. Instead of cutting up a USB cable for the ends, you can buy just the connectors from places like Mouser (www.mouser.com) and Digikey (www.digikey.com)make sure you order the connector and the boot. They have USB A, USB B, and mini USB connectors that can all be soldered.

nice job :-)

the only concerns I have over this are a) the lack of shielding and b) the lack of twists for USB 2.0.

Despite how short this cable is, it's still a recvr/xmitter of noise - which causes errors. USB is good for lost packets, but still will slow you down.

The twists are necessary - I can't remember how, but I seem to remember inductance being an issue and the generation of noise without it. I dont' think that the spiral wire has those internal twists for the data lines.

If it works, great! but I don't think you'll get USB 2.0 speeds out of it.

Twisted pair works by using +5v on one wire and -5v on the other, switching which is which (the opposite strategy is to ground one and do high/low on the other). This drastically reduces the need to shield, because although noise is induced from the outside, roughly the same amount is induced into each wire. The endpoint isn't measuring one wire vs a ground, but rather vs the other wire to see which was higher on the other end. Rather a clever solution, hence why it's pretty much all we use these days.

Running them through two wires that aren't twisted allows outside sources to induce more into one then the other and shielding less allows more noise period. I'm not really qualified to say how much of a difference it makes, but over short distances with both wires close, it can work pretty well. USB devices often have more then spec capability too - it's not unusual to be able to double the length of an allowed shielded cable and still have it work without more then a slight drop in performance.

There are several things happening at once: Twisting, differential signaling, and balanced impedances. All help at resisting interference from other devices, and twisting and differential signaling help reduce emissions from the USB cable to other devices.

There's also the characteristic impedance of the cable itself, which will cause reflections and degraded signals if it's not matched to the source and load. USB cables are actually very precisely designed, and this project isn't really a great idea for cases in which you don't want errors, especially for Hi-speed devices. :-/

Good deal, there are the official terms for those with an itch to google it and know enough to understand the more technical answers.

Still, non-exact as it is, short distance USB (and even ethernet) can survive short distances if speed isn't a big issue (syncing your cell phone/PDAs calendar or something else that just needs a few tens of kb at best) so if there is already an old phone and a zillion USB cables laying around it could be a worth wile thing if bored.

well said. Thanks Larry and endolith. You're better at saying what I was trying to say.

(removed by author or community request)

dude, YOU may not, but others might. Never stifle someone's idea.. it may inspire others to do something different.

Very nice, i might try this,
I see you have a white macbook :P me too!
What can you do with an Arduino board? i havent heard of it before
anyway really good 'ible
5 Star + Favrouited

It's an AVR chip with some peripherals. It's an incredibly easy way to begin programming, especially when you want to interact with the computer over USB. Such as this incredibly awesome video incredibly awesome video

I am in the process of making one right now. Will post pictures when I'm done. Great idea for an instructable!

YA but how fast is it

Great instructable, but I'm sort of thinking, this kind of coil is strong and retains its shape very quickly/firmly. Wouldn't that be a problem for light devices which mini-usb is mostly used for?

excelent Idea. I would caution about making it too long though, because telephone wires are not shielded like USB cables and you will likely loose data if the wire is too much longer. Still a great Instructable!

4.5 rating

Caution: Loose data may have shifted during transfer. Please exert caution when opening overhead packets.

The soldering iron! He's back!!!! Run!!!!!!

+5/5 stars.
(added to favorites)

To cover and protect the bit of wire between the white plastic and the black plastic of the USB connector you could wrap it in electrical tape.

But other than that, this is a very good instructable. Good Job!

I'm sorry, I think is because of my English knowledge: what exactly is the purpose of this thing?

its a longer cable in a smaller space. It can stretch out like a spring and then go back to a shorter version

I think it'd be fine, besides the coiling of the wire adds a bit of a shielding effect regardless. So long as there isn't much crosstalk, it's more of a worry for the power cables it causing interference, but probably no problem.

Yes, I can see that, but what is the actual purpose or what are the applications?

You could use it to connect any electronic devices that both have USB ports together. What you do with it is up to you

OK, sorry, it's my fault. I've seen to identical connectors. Now I see that the two connector are different :)
In a nutshell, is just a cheap stretchy extension cable.
Thanks for the clarification. I can't blame my English, but my eyes :D

Great work

This would be great to put a little LED light on the end of, or even make it into a cell phone charger!!! Im calling this idea! ;D

Great idea, but telephone cables usually aren't shielded, so there may be some RF interference.

that...This needs to be in the book. Thats an AWESOME idea. This needs to go in the book for sure.

I'm voting for it.

nevermind

This is great! I might just have to mate this with the usb mini fan...