int ledPinR = 23; 		// the number of the LED pin 
int ledStateR = LOW; 	// ledState used to set the LED - HIGH or LOW
long previousMillisR = 0; 	// will store last time LED was updated const long interval = // 1000; 
int intervalR = 1000;	// interval at which to blink (milliseconds) 

int ledPinG = 18; 		// the number of the LED pin 
int ledStateG = LOW; 	// ledState used to set the LED - HIGH or LOW
long previousMillisG = 0; 	// will store last time LED was updated const long interval = // 1000; 
int intervalG = 500;	// interval at which to blink (milliseconds) 

int ledPinY = 19; 		// the number of the LED pin 
int ledStateY = LOW; 	// ledState used to set the LED - HIGH or LOW
long previousMillisY = 0; 	// will store last time LED was updated const long interval = // 1000; 
int intervalY = 2000;	// interval at which to blink (milliseconds) 

void setup() 
{ 
pinMode(ledPinR, OUTPUT); 
pinMode(ledPinG, OUTPUT); 
pinMode(ledPinY, OUTPUT);
} 

void loop() 
{ 
  // check to see if it's time to blink the LED; that is, if the difference 
  // between the current time and last time you blinked the LED is bigger than 
  // the interval at which you want to blink the LED. 
  long currentMillis = millis(); 
  if ( currentMillis - previousMillisR >= intervalR) 
    { 
    previousMillisR = currentMillis; // save the last time you blinked the LED 
 	  if (ledStateR == LOW)
 	  { 
    ledStateR = HIGH;
 	  }
    else 
    { 
    ledStateR = LOW; 
    } 
  digitalWrite(ledPinR, ledStateR); 
    }

  if ( currentMillis - previousMillisG >= intervalG) 
    { 
    previousMillisG = currentMillis; // save the last time you blinked the LED 
 	  if (ledStateG == LOW)
 	  { 
    ledStateG = HIGH;
 	  }
    else 
    { 
    ledStateG = LOW; 
    }  
  digitalWrite(ledPinG, ledStateG); 
  }
  
  if ( currentMillis - previousMillisY >= intervalY) 
    { 
    previousMillisY = currentMillis; // save the last time you blinked the LED 
 	  if (ledStateY == LOW)
 	  { 
    ledStateY = HIGH;
 	  }
    else 
    { 
    ledStateY = LOW; 
    }  
  digitalWrite(ledPinY, ledStateY); 
  }

}