int state=0;
unsigned preTime=0;

int pattern[4]={0x04,0x02,0x01,0x07};
void setup() {
  DDRB|=(1<<PB0);
  DDRB|=(1<<PB1);
  DDRB|=(1<<PB2);
  DDRD&=~(1<<PD2);
  attachInterrupt(digitalPinToInterrupt(2),stateChange,FALLING);
    PORTB&=~(1<<PB2)|~(1<<PB1)|~(1<<PB0);

}
void stateChange(){
  if(millis()-preTime>=300){

  if(state<=3){
    PORTB = pattern[state];
    state++;
    preTime=millis();
    if(state>3){
    state=0;
  }
  }
 
  }

}

void loop() {
  // put your main code here, to run repeatedly:

}