modulation with millis

Projects Programming
7

I trust but can´t blink it grrrrrr

const int ledPin =  13;

// Variables will change:
long previousMillis = 0;

long interval = 1000;

void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);      
}

void loop()
{
  // commands for continuous blush
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis > interval) {
    previousMillis = currentMillis;   // save the last time you blinked the LED 

    if (analogRead (ledPin) == 0) 
        analogWrite(ledPin, 255);  
    else          
      analogWrite(ledPin, 0);
  }

  analogWrite(ledPin, 0);

}

What i´m missing :! ? tks for your help