void setup() 
        {
          pinMode(26, OUTPUT);
          pinMode(0, OUTPUT);
          pinMode(1, OUTPUT);
        }
  
        void loop() 
        {
          digitalWrite(26, HIGH); 
          delay(500);                      
          digitalWrite(26, LOW);   
          delay(500);
          digitalWrite(0, HIGH);  
          delay(500);                      
          digitalWrite(0, LOW);  
          delay(500);  
          digitalWrite(1, HIGH);  
          delay(500);                    
          digitalWrite(1, LOW);  
          delay(500);              
        }