#include <xCS11_SDU.h> 
#define BLUE 4

// the setup function runs once when you power the board 
void setup() { 
 // initialize digital pin BLUE as an output. 
 pinMode(BLUE, OUTPUT); 
} 

// the loop function runs over and over again forever 
void loop() { 
 digitalWrite(BLUE, HIGH);   // turn the LED ON
 delay(1000);                       // wait for a second 
 digitalWrite(BLUE, LOW);    // turn the LED OFF
 delay(1000);                       // wait for a second
}