RC bristlebot shifts weight for steering    [Read more...]
Patching into Android music control  Here’s a look at the TRRS
cable that Android phones use. [Rich Kappmeier] want to control
the music player on his Nexus One while driving. It’s not
necessarily a safe endeavor if you’re staring at the screen and
poking away with one hand while trying to stay in your lane. A
little bit of research helped him figure out how the hardware in
a headphone controller worked and he decided to incorporate that
into a connector cable for the car.  The control signals rely on
a specific resistance between the TRRS function ring and ground.
Once he worked out the chart above and targeted the correct
resistance values he built a rocker switch for Fast Forward and
Reverse, as well as a Play/Pause button into the connector
cable. You should be able to use this for more than just music
control. Take a look at our Android Development tutorial and see
what else you can come up with.  [Thanks Alastair]  RGB
stroboscopic guitar tunin