const int sw = 2;
const int ledA = 9;
const int ledB = 10;
const int ledC = 11;

int i = 0;
int val = 0;
int old_val = 0;
int state = 0;

void setup() {
  pinMode(sw, INPUT);
  pinMode(ledA, OUTPUT);
  pinMode(ledB, OUTPUT);
  pinMode(ledC, OUTPUT);
}

void loop() {
  val = digitalRead(sw);

  if ((val == HIGH) && (old_val == LOW)) {
    state = 1 - state;
    delay(10);
    if (state == 1) {
      for (i = 0; i < 256; i++) {
        analogWrite(ledA, i);
        delay(5);
      }
      for (i = 0; i < 256; i++) {
        analogWrite(ledB, i);
        delay(5);
      }

      while (digitalRead(sw) == LOW) {
        for (i = 0; i < 256; i++) {
          analogWrite(ledC, i);
          delay(5);
        }
        delay(800);
        for (i = 255; i > -1; i--) {
          analogWrite(ledC, i);
          delay(5);
        }
        delay(800);
      }
    }
    else {
      for (i = 255; i > -1; i--) {
        analogWrite(ledA, i);
        analogWrite(ledB, i);
        analogWrite(ledC, i);
        delay(5);
      }
    }
  }
  old_val = val;
}