const byte kirmizi=8, mavi=9, yesil=10;
byte x, y = 0;
void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
if (y == 0) {
x = x + 225;
analogWrite(kirmizi, x);
delay(1000);
}
 if (x == 255) {
y = y - 225;
analogWrite(kirmizi, y);
delay(1000);
 }
if (y == 0) {
x = x + 225;
analogWrite(yesil, x);
delay(1000);
}




}