int pin1=1;
int pin2=2;
int pin4=4;
int delayt=500;
int blueLed=3;
int brightness=255;
int brightness2=23;
void setup() {
  // put your setup code here, to run once:
  pinMode(pin1, OUTPUT);
  pinMode(pin2, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(pin4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(pin1, LOW);
  digitalWrite(pin2, HIGH);
  analogWrite(blueLed,brightness);
  digitalWrite(pin4, HIGH);
  delay(delayt);
  digitalWrite(pin1, HIGH);
  digitalWrite(pin2, LOW);
  analogWrite(blueLed,brightness2);
  digitalWrite(pin4, LOW);
  delay(delayt);
}