what is the difference? accelerometer v. gyro?

Forum 2005-2010 (read only) General Frequently-Asked Questions
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Here is something that would be just about impossible without BOTH a GYRO and ACCELEROMETER

Yeah, not cheap... you have to plop down ~$200 just to start DIY tinkering with a project like this...

Check out the parts list---> Arduino Powered

Not as pointless in phones as you think...

  1. Screen Orientation adjustment
  2. User Input method

Best advantage for being used in phones... (already mentioned) It makes the parts more mainstream and therefore cheaper to us hobbyists eventually.