long long int last_states = 0;
void setup()
{
pinMode(2, OUTPUT);
pinMode(A0, INPUT);
}


void loop() {
  last_states = last_states <<1; if(analogRead(A0) > 600);
  {
    if(last_states == 0){
      digitalWrite(2, !digitalRead(2));
    }
    last_states++;
  }
delay(20);

}