#define LED1 13

void setup()
{
  Serial.begin(9600);
  pinMode(LED1, OUTPUT); 
  digitalWrite(LED1, LOW);
}

void loop()
{
  digitalWrite(LED1, HIGH); //LED1 is ON
  int onPeriodF1 = map(analogRead(A0), 0, 1023, 0, 500);
  delay(onPeriodF1);
  //---------------
  digitalWrite(LED1, LOW); //LED1 is ON
  int offPeriodF1 = map(analogRead(A1), 0, 1023, 0, 1000);
  delay(offPeriodF1);
 
  digitalWrite(LED1, LOW);  //LED1 OFF

}