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 Post subject: USB power leech
PostPosted: Fri Nov 14, 2014 2:01 am 
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Joined: Fri Nov 14, 2014 1:48 am
Posts: 2
This has so far proved innocuous for JUST programming.
I'm sure many of you have tried it... ?

Image

This picture wouldn't come in much clearer, but basically, I'm leeching +5V from the USB cable connector on the serial adapter- not the adapter itself, the PLUG BEFORE the adapter part of the circuit. My port under windows said the adapter uses 90ma, so I knew some current was left over for me to use. Still says 90ma, by the way.


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 Post subject: Re: USB power leech
PostPosted: Tue Nov 18, 2014 5:43 am 
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Joined: Fri Apr 12, 2013 8:38 pm
Posts: 87
Location: Nottingham, England, UK
HI

YES looks like a good idea to tap off the computers USB power here,

Thanks for posting it,

Dave
BasicMicroUK
www.basicmicro.co.uk


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 Post subject: Re: USB power leech
PostPosted: Tue Nov 18, 2014 6:48 am 
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Joined: Fri Nov 14, 2014 1:48 am
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Thanks! It's good to know I'm at least probably right!
Really like the Nanos a whole lot!

******
Novices to soldering should be advised:
The connections there are VERY small.
There may be differences in serial port adapters!!!
Be careful and don't BLOW OUT your computer!
Don't depend on my picture!!!!!!!
If you must, use a multimeter at least!
******

But it IS cool!


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 Post subject: Re: USB power leech
PostPosted: Sat Nov 29, 2014 6:22 pm 
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Joined: Thu Mar 01, 2001 7:00 pm
Posts: 1316
Location: Temecula, CA
USB can provide 100ma without asking for any extra power. Potentially 500ma if the USB device asks for it. So as long as your circuit doesn't need more than 100ma you should be fine.

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Basic Micro - Robotic Technology Evolved


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