int SETpwm = 0;

void setup() {  
  Serial1.begin(9600);
  pinMode(16, OUTPUT);  // PWM Pin 
  
  //--- SET PWM Signal --- 
  // analogWriteFreq(1000);
  // analogWriteRange(65535);
  // analogWriteResolution(16);
}

void loop() {
  
      Serial1.println(" PWM = 0");
      SETpwm = 0;                
      analogWrite(16,SETpwm);    
      delay(500);
       
      Serial1.println(" PWM = 64");
      SETpwm = 64;                
      analogWrite(16,SETpwm);    
      delay(500);

      Serial1.println(" PWM = 128");
      SETpwm = 128;              
      analogWrite(16,SETpwm);    
      delay(500);

      Serial1.println(" PWM = 192");
      Serial1.println(" ");
      SETpwm = 192;               
      analogWrite(16,SETpwm);    
      delay(500);      
    }