int red=3;  //for analog signal, we use pwm pins.
int green=5;
int blue=6;
int pb=2;
int c=0;
void setup() {
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
  pinMode(pb, INPUT);
}

void loop() {
  int signal=digitalRead(pb);
  if (signal==1){c++;
  if (c==1){
    rgb(255,0,0);
    delay(1000);
    rgb(216,87,226);
    delay(1000);
    rgb(255,121,64);
    delay(1000);
    rgb(110,20,57);
    delay(1000);
    rgb(110,30,248);
    delay(1000);}

    else if (c==2){
    rgb(0,255,0);
    delay(1000);
    rgb(54,180,26);
    delay(1000);
    rgb(54,122,146);
    delay(1000);
    rgb(154,204,146);
    delay(1000);
    rgb(114,245,217);
    delay(1000);}

    else if (c==3){
    rgb(0,0,255);
    delay(1000);
    rgb(54,180,26);
    delay(1000);
    rgb(54,122,146);
    delay(1000);
    rgb(154,204,146);
    delay(1000);
    rgb(114,25,217);
    delay(1000);}

    else {
      rgb(0,0,0);
      delay(1000);
      c=0;
    }
    }

  /*
  analogWrite(red,58);
  delay(100);
  analogWrite(green,10);
  delay(100);
  analogWrite(blue,230);
  delay(100);
  */
}
void rgb(int r,int g,int b){
  analogWrite(red,r);
  analogWrite(green,g);
  analogWrite(blue,b);
}