int greenPin = 4;
int redPin = 5;
int bluePin = 6;

int red_led_state=LOW;
int green_led_state=LOW;
int blue_led_state=LOW;

byte brightnes=0;
byte fadeinctesment=1;


unsigned long currentMillis = 0;

unsigned long blink_red_prev_millis = 0;
unsigned long blink_red_period = 250; 

unsigned long random_period_red_prev=0;
unsigned long random_period_red_period=1000;

unsigned long fade_blue_prev_millis = 0;
unsigned long fade_blue_period = 10; 

unsigned long blink_green_prev_millis = 0;
unsigned long blink_green_period = 250; 


void fade_blue () {
  if(currentMillis - fade_blue_prev_millis >=fade_blue_period){
    fade_blue_prev_millis=currentMillis;
    analogWrite(bluePin,brightnes);
    brightnes += fadeinctesment;

}
 
}

void random_period_red () {
if (currentMillis - random_period_red_prev >=random_period_red_period) {
   random_period_red_prev = currentMillis;
   blink_red_period = random(50, 500);
}

}

void blink_red_led () {

if (currentMillis - blink_red_prev_millis >=blink_red_period) {
   blink_red_prev_millis = currentMillis;
  
  if (red_led_state==LOW) {red_led_state=HIGH;} else {red_led_state=LOW;}
  digitalWrite(redPin,red_led_state);
}}

void blink_green_led () {

if (currentMillis - blink_green_prev_millis >=blink_green_period) {
   blink_green_prev_millis = currentMillis;
  
  if (green_led_state==LOW) {green_led_state=HIGH;} else {green_led_state=LOW;}
  digitalWrite(greenPin,green_led_state);
}}

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  currentMillis=millis();
  blink_red_led();
  fade_blue();
  blink_green_led () ;
  random_period_red ();
  
Serial.println(blink_red_period);
}