int pin          =  5;// LED connected to PWM pin 5 
int pin1         =  6;
int m1           =  7;
int m2           =  4;
int dv  =  11;// LED connected to PWM pin 11 
int pulsewidth2  = 0; 
int pulsewidth3  = 50;
int pos=0;
  
void setup() 
{  
   Serial.begin(9600);
 pinMode(dv, OUTPUT);
   
}  
  
void loop() 
{
if(Serial.available()>0){
      char aChar = Serial.read();
      
    if(aChar == '<')
    {
	pos = 0;
	do{
	    while(Serial.available() <1)
		; // wait for a character
	  aChar = Serial.read();
	  if(aChar >= '0' && aChar <= '9')		  // is ch a number?
	    pos = pos * 10 + aChar - '0';	     // yes, accumulate the value
	}
	while(aChar != '>');
	analogWrite(dv, (pos-256));
	pos = 0; 
    }
}
if(Serial.available()>0){
    int userInput=Serial.read();    
    if(userInput=='a') // 1 to set the LED ON with pwm
      {  
      digitalWrite(m2, HIGH); 
      analogWrite(pin, 50);
      
      }  
    if(userInput=='b') // 2 to set the LED ON with pwm
      { 
      digitalWrite(m1, HIGH);   
      analogWrite(pin, 200);
     
      }  
    if(userInput=='o') // 0 to set the LED Off with pwm
      {   
      analogWrite(pin1, pulsewidth2);
      analogWrite(pin, pulsewidth2);
      }  
}
    }