void setup() {
   Serial.begin(57600);
   for (int i=0;i<15;i++) {
      Serial.print("Pin #");
      Serial.print(i); // n = Digital pin number
      if (digitalPinHasPWM(i)) {
         Serial.println(" Has PWM **");
      } else {
         Serial.println(" No PWM");
      }
   }
} 

void loop() { }