Addressing analog pins on the arduino pro mini

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2

I've always used 14 to 19 instead of A0 to A5, makes it more clear that digital is being used.
So:

byte pin19 = 19;
void setup() {                
  // initialize the digital pin as an output.
  pinMode(pin19, OUTPUT);     
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(pin19, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3000);               // wait for a second
  digitalWrite(pin19, LOW);    // turn the LED off by making the voltage LOW
  delay(3000);               // wait for a second
}

3000 = 3 seconds, not 1 second