電位器控制led閃爍

const int led=2;
int val;
float volts;
void setup()
{
  pinMode(led,OUTPUT);
  digitalWrite(led,HIGH);
}
void loop()
{
  val=analogRead(0);
  val=map(val,0,1023,0,255);
  digitalWrite(led,HIGH);
  delay(val);
  digitalWrite(led,LOW);
  delay(val);
}