low power arduino mini pro

hi first tell im newbie learning arduino. want small project. there want make below code low power consuming. please 1 me .

im going use 2xaaa battery. in vcc pin . code take 17ma.  arduino mini pro

pin 2 has reed switch. when trigger 13 pin give led blink 10 s. door closed when closed arduino should sleep.

help me project.

code: [select]

////////////////////////////////////

const int buttonpin = 2;
const int ledpin =  13;
byte ledflag = 0;
byte enableflag = 0;
unsigned long ledtime;
unsigned long flashtime;
const unsigned long flashrate = 500ul;
int buttonstate = 0;

void setup()
{

  pinmode(ledpin, output);
  pinmode(buttonpin, input_pullup);

}

void loop()
{


  buttonstate = digitalread(buttonpin);
  if (buttonstate == high && ledflag == 0)
  {
    digitalwrite(ledpin, high);
    ledflag = 1;
    enableflag = 1;
    ledtime = millis();
    flashtime = millis();
  }
  if (enableflag == 1 && millis() - ledtime <= 4000ul)
  {
    if (millis() - flashtime >= flashrate)
    {
      flashtime = millis();
      digitalwrite(ledpin, !digitalread(ledpin));
    }
  }
  else
  {
    enableflag = 0;
    digitalwrite(ledpin, low);
  //  lowpower.powerdown(sleep_8s, adc_off, bod_off);
  }
  if (buttonstate == low)
  {
    ledflag = 0;
    enableflag = 0;
    digitalwrite(ledpin, low);
    lowpower.powerdown(sleep_8s, adc_off, bod_off);

  }
}


is arduino 3.3v model? if you, why planning power less 3.0v?

the code posted something. not clue does.
you expect code posted something. not clues expect or how differs happens.

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