int blueled =A1;
int brightness1 =0;
int brightness2 =1;
int brightness3 =30;
int brightness4 =80;
int brightness5 =150;
int brightness6 =250;
int dt=500;


void setup() {
pinMode(blueled, OUTPUT); 
}

void loop() {
  analogWrite(blueled,brightness1);
  delay(dt);

  analogWrite(blueled,brightness2);
  delay(dt);

  analogWrite(blueled,brightness3);
  delay(dt);

  analogWrite(blueled,brightness4);
  delay(dt);

analogWrite(blueled,brightness5);
  delay(dt);

  analogWrite(blueled,brightness6);
  delay(dt);
}