# led pannel

https://forum.arduino.cc/t/velleman-vma419-in-series/651584

https://code.google.com/archive/p/arduino-timerone/downloads
https://www.velleman.eu/downloads/29/vma419_a4v02.pdf

code basique

#include "SPI.h"
#include "DMD419.h"
#include "TimerOne.h"
#include "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 */
DMD419 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) */

}

void loop()
{
dmd.selectFont( SystemFont5x7 );
dmd.drawChar( 5, 5, 'Z', GRAPHICS_NORMAL );
}