Arduino - LED blinker

gistfile1.txt

const int PIN = 7;

void setup()
{
  pinMode(PIN, OUTPUT);
  digitalWrite(PIN, LOW);
}

const int MAX = 400;
const int MIN = 5;

int index = 0;
float delayNow = 0;

void loop()
{
  delayNow = MIN + MAX * (1 + sin(index/16.0 * 3.1415))/2;
  index = (index + 1) % 32;
  digitalWrite(PIN, HIGH);
  delay(delayNow);
  digitalWrite(PIN, LOW);
  delay(delayNow);
}