Random LED Fade

LED_Fade

#include <MsTimer2.h>

#define OUT_MIN 0
#define OUT_MAX 20

byte luminance[20];
byte lumi[20] = {};

void setup()
{
 int i;

 for(i = OUT_MIN; i <= OUT_MAX; i++){
   pinMode(i, OUTPUT);
   digitalWrite(i,LOW);
 }
 
 for(i = OUT_MIN; i <= OUT_MAX; i++){
   pinMode(i, OUTPUT);
   digitalWrite(i,LOW);
 }

  for(i = OUT_MIN; i <= OUT_MAX; i++){
   pinMode(i, OUTPUT);
   digitalWrite(i,LOW);
 }

 for(i = OUT_MIN; i <= OUT_MAX; i++){
   digitalWrite(i,HIGH);
   delay(50);
 }
 for(i = OUT_MIN; i <= OUT_MAX; i++){
   digitalWrite(i,LOW);
   //delay(50);
 }
 delay(100);

 MsTimer2::set(1, int_pwm);
 MsTimer2::start();
}


void int_pwm() {

 static int f_wait[20];
 static int f_max_time[20];
 static int f_speed[20];
 static int f_ct[20];
 static long f_interval[20];

 static int ch;

 for(ch = OUT_MIN; ch <= OUT_MAX; ch++){
   if(f_wait[ch] == 0){
     f_wait[ch] = f_speed[ch] + 1;

     if( (f_ct[ch] < 255) )
       if(luminance[ch] != 255)
         luminance[ch] ++;

     if(f_ct[ch] == 255){
       if(f_max_time[ch] == 0)
         f_max_time[ch] = 0; // On Max Time
       else
         f_max_time[ch] --;
     }

     if( (f_ct[ch] > 255) && (f_ct[ch] < 511) && (f_max_time[ch] == 0))
       if(luminance[ch] != 0)
         luminance[ch] --;

     if(f_ct[ch] >= 511){
       if(f_interval[ch] == 0){
         f_interval[ch] = 10 * random(100); // fading seed
         f_speed[ch] = random(10); // fading speed
         f_ct[ch] = 0;
       }
       else
         f_interval[ch] --;
     }
     else
       f_ct[ch] ++;
   }
   f_wait[ch] --;
 }
}

void fading(){

 static byte counter = 0;
 static boolean prev_off[20];
 int i;

 for(i = OUT_MIN; i <= OUT_MAX; i++){
   if(lumi[i] == 0){
     if(prev_off[i] == HIGH){
       digitalWrite(i,LOW);
       prev_off[i] = LOW;
     }
   }
   else
     lumi[i] --;
 }

 counter --;

 if(counter == 0){
   for(i = OUT_MIN; i <= OUT_MAX; i++){
     if(luminance[i]){
       digitalWrite(i,HIGH);
       prev_off[i] = HIGH;
     }
     lumi[i] = luminance[i];
   }
 }
}


void loop(){
 fading();
}