Essential Code

#include "SPI.h"
#include "DMD.h"
#include "TimerOne.h"
#include "Arial_black_16.h"<arial_black_16.h>
// you can remove the fonts if unused
#include "SystemFont5x7.h"
#define DISPLAYS_ACROSS 1
#define DISPLAYS_DOWN 1
/* change these values if you have more than one DMD connected */
DMD dmd(DISPLAYS_ACROSS,DISPLAYS_DOWN);

void ScanDMD()
{
  dmd.scanDisplayBySPI();
}

void setup()
{
   Timer1.initialize( 5000 );
/*period in microseconds to call ScanDMD. Anything longer than 5000 (5ms) and you can see flicker.*/

   Timer1.attachInterrupt( ScanDMD );
/*attach the Timer1 interrupt to ScanDMD which goes to dmd.scanDisplayBySPI()*/

   dmd.clearScreen( true );
/* true is normal (all pixels off), false is negative (all pixels on) */
}