void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.setTimeout(50);
  Serial.println("Hello!");
  pinMode(A5, OUTPUT);
  pinMode(A4, OUTPUT);
  analogWrite(A4, 240);

}

void loop() {
  
  // put your main code here, to run repeatedly:
if (Serial.available() > 1 ) {
  delay(100);
  char key = Serial.read();
  delay(100);
  Serial.println(key);
  int val = Serial.parseInt();
  Serial.println(val);
  Serial.flush();
  switch (key) {
    case 'a' : analogWrite(A5, val);
    Serial.println("Red");
    break;
    case 'c' : //analogWrite(A4, val);
    Serial.println("Green");
    break;
  }
}
}