Pisca led com millis

unsigned long tempoatual;
unsigned long temposalvo = 10000;
int led = 6;

void setup(){
  pinMode (led, OUTPUT);
}
void loop(){
  tempoatual = millis();
  if (tempoatual - temposalvo >= 5000){
    digitalWrite (led, LOW);
  }
  else {
    digitalWrite (led, HIGH);
  }
    temposalvo = tempoatual;

}