void setup() {
  // put your setup code here, to run once:
  pinMode(25, OUTPUT);
  pinMode(27, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(27, HIGH);
  for(int i = 0; i<255; i++){
    analogWrite(25,i);
    delay(20);
  }
  
}