led-001.c

#define MAXLED 3
int ledPins[MAXLED][3] = {
  {2,3,4},
  {5,6,7},
  {8,9,10},
};

typedef struct _rgb {
  float r;
  float g;
  float b;
} RGB;

typedef struct _led {
  RGB cur;
  RGB to;
  RGB delta;
} led;

led leds[MAXLED];
  
void setup() {
  Serial.begin(9600);
  randomSeed(analogRead(0));
  
  for (int i=0; i!=MAXLED; i++) {
    leds[i].cur.r = random(0,255);
    leds[i].cur.g = random(0,255);
    leds[i].cur.b = random(0,255);
    
    calc_delta(i);
  }
  
}


int  rand() {
  if (random(0,10) < 5) return 255;
  return 0;
}
  
void calc_delta(int led) {
  leds[led].delta.r =  (rand() - leds[led].cur.r) / 10;
  leds[led].delta.g =  (rand() - leds[led].cur.g) / 10;
  leds[led].delta.b =  (rand() - leds[led].cur.b) / 10;  
}

void loop()  { 
  
  for (int s=0; s!=10; s++) {
    delay(100);
    
    for (int i=0; i!=MAXLED; i++) {
      analogWrite(ledPins[i][0], byte(leds[0].cur.r));
      analogWrite(ledPins[i][1], byte(leds[0].cur.g));
      analogWrite(ledPins[i][2], byte(leds[0].cur.b));        
    }
    
    for (int i=0; i!=MAXLED; i++) {
      leds[i].cur.r += leds[i].delta.r;
      leds[i].cur.g += leds[i].delta.g;
      leds[i].cur.b += leds[i].delta.b;
    }
    
    Serial.print("LED1: ");
    Serial.print(int(leds[0].cur.r));
    Serial.print(" ");
    Serial.print(int(leds[0].cur.g));
    Serial.print(" ");
    Serial.print(int(leds[0].cur.b));    
    Serial.println("");

  }
  
  for (int i=0; i!=MAXLED; i++) {
    calc_delta(i);
  }
  
}