Patent ID: 7856214

Claim:
A cell phone comprising: a case; a keypad having keys laid out in rows and in columns residing on a surface of the case for controlling device functions; an electronic circuit inside the case receiving inputs from the keypad and performing communications functions; a battery electrically connected to the electronic circuit for providing power to the electronic circuit; and a motion switch comprising a first motion switch aligned to respond to motion along the columns of the keypad and a second motion switch aligned to respond to motion along the rows of the keypad, the motion switches comprising at least one generator having an off-center mass attached to a generator shaft and motion of the cell phone acts on the off-center mass to cause the generator shaft to rotate and the generator to generate electrical current and provide the electrical current to the electronic circuit, the motion switch providing a non-zero electrical signal to the electronic circuit during motion of the case and providing a zero electrical signal to the electronic circuit when the case is stationary, the motion switch electrically connected to the electronic circuit to control at least one of the device functions.