USB allows to share all kind of data on a small USB-Stick, on every PC. Even big amounts of data can be carried on an USB Hard drive. And it' s a perfekt power soure for mobile devices eg. cellphones or MP3-Players.
But soon you'll spot the first problems. You just haven't enough USB-Ports to charge all your moblie devices. Hard drives need to much power for some PC's, most stereo systems and all USB-OTG(on the go) devises. It's Impossible to charge Ipods with a normal USB charger.
I was annoyed of all these problems, so I thought about a solution. I came out with this USB-stick-sized adapter. It should help you with all your USB power problems.
Mainly it has 4 functions:
1. Charge two USB-devices at a single port, while one is still connected to your PC/ other host.
2. Charge two USB-devices with an external power supply.
3. Take power from an external power supply to be able to run USB hard drives on OTG devices, stereo systems, ...
4. Charge your Ipod (I haven't on so I can't tell you if it works). This may even help to charge your moblie phone faster, but try it at your own risk.
Make sure you read the Important Information below.
Step 1: Important Information
Read through everything (especially read bold and underlined words/phrases) before you start. Steps in [ ] are not nesessary for some functions. You can skip these steps if you want.
For this projekt it is very importent to work exactly. Even tiny mistakes can cause big problems. Reminder that whenever you work with USB. (or do you want to blow up your mainboard / phone / anything else ?)
This isn't an USB-Hub, so dont say " the second port doesn't work for my USB-stick". The second port just offers power to charge devices.
If you want to run a hard drive at a OTG-device (in my case it's the S2) remeber it might just accept Fat32 which limits the size of one file to 4GB.
If you can check first if your hard drive runs with just power. Simply plug it into an USB charger and watch if the LED turns on or not. If the LED does't turn on (and your hard drive doesn't make the usual sounds) function 3 might not work.
I might have mixed up meanings of a few words (like port & socket) but I'm too lazy to correct it. That's it for now. Go on.