for(i=255;i>=0;i--){
   analogWrite(pinRed,i);
   delay(4);
}
  

    
for(i=0;i<=255;i++){
   analogWrite(pinGreen,i);
   delay(4);
}
  

    
#define pinBtn 11
#define pinGreen 10
#define pinRed 9

short cnt;
int btn_d;
int btn;
void setup() {
    pinMode(pinBtn,INPUT_PULLUP);
    pinMode(pinGreen,OUTPUT);
    pinMode(pinRed,OUTPUT);
    btn_d=HIGH;
    cnt=0;
    digitalWrite(pinRed,HIGH);
    delay(100);
    digitalWrite(pinRed,LOW);
}

void loop() {
    int i;
    btn=digitalRead(pinBtn);
    if((btn==LOW)&&(btn_d==HIGH)){
        switch (cnt)   {
            case 0:
                digitalWrite(pinGreen,HIGH);
                digitalWrite(pinRed,LOW);
                break;
            case 1:
                digitalWrite(pinGreen,LOW);
                digitalWrite(pinRed,HIGH);
                break;
            case 2:
                for(i=255;i>=0;i--){
                    analogWrite(pinRed,i);
                    delay(4);
                }
                for(i=0;i<=255;i++){
                    analogWrite(pinGreen,i);
                    delay(4);
                }
                break;
            case 3:
                for(i=255;i>=0;i--){
                    analogWrite(pinGreen,i);
                    delay(4);
                }
                for(i=0;i<=255;i++){
                    analogWrite(pinRed,i);
                    delay(4);
                }
                break;
        }
        cnt++;
        cnt=cnt%4;
    }
    btn_d=btn;
    delay(100);
}