#include <LedControl.h>

LedControl lc = LedControl(2, 3, 4, 1); 

void setup() {
  lc.shutdown(0, false);       
  lc.setIntensity(0, 8);    
  lc.clearDisplay(0);      
}

void loop() {
  lc.setLed(0, 0, 7, true);   
  delay(1000);                
  lc.setLed(0, 0, 7, false);  
  delay(1000);               
}