Arduino sleep mode accelerometer

ok im trying make put arduino sleep wake arduino when accelerometer moved. log time moved at, go sleep  if no movement 5 minutes.

any ideas on how program this?

the thing concerns me if accelerometer need constant 5 volts able send code wake arduino up, therefor defeting perpose of putting sleep in first place

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any ideas on how program this?

there few examples available on internet show how put processor sleep.  here 2 started with...
http://www.arduino.cc/playground/learning/arduinosleepcode
http://interface.khm.de/index.php/lab/experiments/sleep_watchdog_battery/

the processor can wakened interrupt.  if accelerometer has way of generating interrupt (a serial recieve may it), want may work.

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log time moved at

save great headache.  plan include real-time clock.

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the thing concerns me if accelerometer need constant 5 volts able send code wake arduino up, therefor defeting perpose of putting sleep in first place

if goal run batteries every little bit helps.

a few caveats...

• the deeper sleep modes turn off processor's clock (which may disable serial port , definately stops millis counter)
  
• it can take serveral clock cycles processor wake.  the processor may not wake fast enough catch first bit of data accelerometer.
  
• the watchdog oscillator not reliable source of time.  temperature , load affect dramatically.  and when stable still has jitter , drift.
  

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