//We always have to include the library #include "LedControl.h" /* Now we need a LedControl to work with. ***** These pin numbers will probably not work with your hardware ***** pin 12 is connected to the DataIn pin 11 is connected to the CLK pin 10 is connected to LOAD We have only a single MAX72XX. */ LedControl lc=LedControl(12,11,10,1); /* we always wait a bit between updates of the display */ unsigned long delaytime=250; void setup() { /* The MAX72XX is in power-saving mode on startup, we have to do a wakeup call */ lc.shutdown(0,false); /* Set the brightness to a medium values */ lc.setIntensity(0,8); /* and clear the display */ lc.clearDisplay(0); } void loop() { void loop() { lc.clearDisplay(0); lc.setDigit(0,0,2,false); lc.setDigit(0,1,2,false); lc.setDigit(0,2,3,true); lc.setDigit(0,3,0,true); delay(2000); }