char inVal = 0;
int ledPin=7;
                
void setup() 
{
  Serial.begin(9600);         
  pinMode(ledPin, OUTPUT);       
}

void loop()
{
  if(Serial.available() > 0)  
  {
    inVal = Serial.read();      
    Serial.println(inVal);        
    //Serial.print("\n");        
    if(inVal == '1')             
      digitalWrite(ledPin, HIGH);  
    else if(inVal == '0')       
      digitalWrite(ledPin, LOW);   
  }                            
}