const int analog = A0;
const int led = 7;
int delayv = 0;

void setup() {
  pinMode(led, OUTPUT);

}

void loop() {
  int analogv = analogRead(analog);
  int mapa = map(analogv, 0, 1023, 1023, 50);
  digitalWrite(led, HIGH);
  delay(mapa);
  digitalWrite(led, LOW);
  delay(mapa);
}