USB

i was wondering......i know computers can give electricty through USB, but can they recive it through a USB port?

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westfw9 years ago
Connect up 110V to your USB port, and I predict your computer will receive enough electricity to cause it to cease functioning properly!

More seriously, a USB "host" is only supposed to source power, and a typical host (eg a desktop PC) has power requirements (100+ watts, several voltages) that it cannot get through the USB port (which is limited to 500mA, or about 2.5W)
Now, a USB "device" can certainly be a computer in its own right, and still be powered from the USB host, as long as it consumes less than 500mA. There are some pretty impressive computers that fit that profile, but a full sized laptop or desktop probably won't.
hypermon westfw7 years ago
first of all you said up to 110 v volts is potential energy while amps is current i dont know if you just messed it up accidentally but otherwhise here is my reply
What could be done with that micro "computer"? It looks like an AVR programmer module
If you mean the BeagleBoard, you're looking at a 600MHz superscaler 32bit processor with 128M of ram, plus DSP and graphics accelerator with HD video output capability plus assorted expansion. That probably makes it similar in capabilities to, say, the ~1GHz Pentium-3 desktops that were near state-of-the-art about 8 years ago. You could do LOTS of stuff with it.
Ya, bt you can't connect a CD drive and install windows XP on it
You can probably connect a CD via USB, and it does run linux. It's probably also capable of running WINCE (it's not called that any more, is it...)
And cost?
You mean other than the big $149 (for the hardware) on the referenced web page? I don't know how to get a wince lincense, or how much it costs.

Another (somewhat less powerful) example of a USB-powered board is the the Make Controller

And still less powerful, you have your Arduino
Make Controller ->55MHZ Maybe run Pacman on it? Arduino ->16MHZ
Neither the Make Controller nor the Arduino have video by default.

The original PacMan apparently ran on a 3MHz Z80 ( Wikipedia says so! ), which is rather slower than the Arduino, but also more easily attached to peripherals (like video controllers.)
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