Functions to make an LED breathe, or "pumm"

pumm.pde

void pummOn(int pin, int fadeIncr, int delayTime) {
  for (int i = 0; i < 256; i += fadeIncr) {
    analogWrite(pin, i);
    delayMicroseconds(delayTime);
  }
}

void pummOff(int pin, int fadeIncr, int delayTime) {
  for (int i = 255; i >= 0; i -= fadeIncr) {
    analogWrite(pin, i);
    delayMicroseconds(delayTime);
  }
}