led_pulsing.c

typedef struct Color {
  int red, green, blue;
};

const Color red = {255, 0, 0};
const Color green = {0, 255, 0};
const Color white = {255, 255, 255};
const Color yellow = {255, 255, 0};
const Color orange = {255, 100, 0};
const Color off = {0, 0, 0};

typedef struct Led {
  int pin_r, pin_g, pin_b;
};

const Led myLed = {9, 10, 11};

void set_color(Color c, Led l, float intensity) {
  if(intensity > 1.0) {
    intensity = 1.0;
  }
  else if(intensity < 0.0) {
    intensity = 0.0;
  }
  analogWrite(l.pin_r, c.red * intensity);
  analogWrite(l.pin_g, c.green * intensity);
  analogWrite(l.pin_b, c.blue * intensity);
}

void set_color(Color c, Led l) {
  set_color(c, l, 1);
}

void pulse(Color c, Led l) {
  Serial.println("pulse");
  unsigned long start = millis();
  unsigned long end_millis = start + 1000;
  while(millis() < end_millis) {
    int elapsed = millis() - start;
    float intensity = ((1000 - elapsed) / 1000.0);
    set_color(c, l, intensity);
  }
}

void pulse(Color c, Led l, int times) {
  for(times; times > 0; times--) {
    pulse(c, l);
  }
}

void setup() {
  Serial.begin(9600);
  Serial.println("Beginning...");
  pinMode(myLed.pin_r, OUTPUT);
  pinMode(myLed.pin_g, OUTPUT);
  pinMode(myLed.pin_b, OUTPUT);

}

void loop() {
  pulse(green, myLed, 5);
  pulse(orange, myLed, 5);
  set_color(red, myLed);
  delay(10000);
}