With more and more gadgets coming out every day that utilize USB for
charging, it’s almost necessary to have a USB port available at all
times. This DIYer decided to create a 5V generator using his bike and a
modified USB car charger. The 5V USB plugs are situated under his seat
and he has a carrying rack for cellphones, GPS, or MP3 players on the
go.
The USB bike generator works by placing a rotating wheel perpendicular
to the rear wheel of the bike with a heavy spring. The mini-wheel turns a
stepper motor to generate a charge that is then smoothed out by an
in-line rectifier.[Link]
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