---

const int LED = 10;

void setup()
{
    pinMode(LED, OUTPUT);
}

void loop()
{
    for (int level = 0; level <= 255; level++)
    {
        analogWrite(LED, level);
        delay(8/16);
    }

    for (int level1 = 255; level1 >= 0; level1--)
    {
        analogWrite(LED, level1);
        delay(0);
    }
}