Bicycle powered iPhone charger
- From: BikePilgrim <bikepilgrim@xxxxxxxxx>
- Date: Mon, 7 Jan 2008 16:33:55 -0800 (PST)
Hello, I recently built-up a front wheel for my bicycle that has a 6v/
3.5w dynamo. These are designed to power headlamps, but I'd prefer to
store the electricity in a battery which could charge my phone. I
believe iPhones charge on standard USB.
My first question is about the battery. Of course, any cell or
chemistry would do, but I'd like to use NiMH AA cells so that I could
easily replace them, and use them in other devices like cameras and
radios while I'm bike-camping. From what I've read, charging NiMH
isn't easy, so I'd prefer to find something off the shelf to use. Is
it possible (or advisable) to use a AA charger as a battery while also
charging the cells? I'm quite in the dark on this topic, and would
appreciate any guidance I can get.
Next, once I have a battery pack that's being charged by my front
wheel, how should I go about charging the iPhone. I will likely use an
off-the-shelf iPhone car charger which are often little more than
cigarette lighter to USB adapters, but these are made for 12v, so I
assume their circuits will be mostly useless to me. What would be
involved in creating a USB outlet on my battery pack?
Once those two fundamental questions are answered I'd like to dream a
little; It'd be most awesome to have a loud speaker built into the
battery pack so that the iPhone could also bump tunes when I'm riding
with friends. Assuming I can somehow re-purpose an OTS iPhone dock, I
should have access to some audio wires, and run them to a volume
dimmer and then to a small speaker. A headlight would be handy too,
but I'm not sure that there will be enough juice for all that. Just
wanted to throw that out there so y'all will know where I'm going.
And just to put minds at ease, I'll use a good sturdy protector case
to house it while it's mounted on the bike. I don't want it to get
hurt in an accident, but it'll be handy to have maps available on my
handlebars.
This is my first serious electronics project, so I'm all ears.
.
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