fade_tiny85.ino

int angle = 0;
int redState = 0;

void setup() {
  pinMode(0, OUTPUT);
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
}

void loop() {
  angle = (++angle) % 360;
  double level0 = sin(angle * 3.14159 / 180.0);
  double level1 = sin(((angle+180) % 360) * 3.14159 / 180.0);
  if(angle == 0) redState = !redState;

  analogWrite(0, convert(level0));
  analogWrite(1, convert(level1));
  digitalWrite(2, redState);
  delay(8);
}

// Convert -1..1 to 0..255
int convert(double level){
  return (level + 1.0) / 2.0 * 255.0;
}

Because it's already in a loop, and I might want to do other things in loop() besides fade an LED. :)