Example on how to show a list of letters with LED matrix on Arduino

led letter list.ino

#include "TimerObject.h"
#include "LedMatrixObject.h"

TimerObject *timer = new TimerObject(1000); //change letter each second
LedMatrixObject *led = new LedMatrixObject(2, 3, 4, 5, 6, 7, 8, 9);


int letterId = 0; //you can set a number to represent each leter. You check this number on loop()
int letterList[] = {0, 4, 2, 10}; //list of letters in order

void setup(){
	timer->Start();
	timer->setOnTimer(&updateLetter);
}

void updateLetter(){
	//here you update your letters by id
	//this function will be called each second
	//so we check the letterID and update its value to the next letter
	
	for(int i = 0; i < 4; i++){ //update this line. 4 is the size of the word
		if(letterList[i] == letterId && i < 3){ //if this is the displayed letter
			letterId = letterList[i+1]; //get the next letter
		}
		if(i == 3){//update this line. 3 is the size of the word - 1
			letterId = letterList[0]; //return to the fist letter
		}
	}
}

void loop(){
	timer->Update(); //run the timer. Each 1 second will call the updateLetter() and modify letterID
	switch (letterId) {
	    case 0:
	      led->setScene(A);
	      break;
	    case 1:
	      led->setScene(B);
	      break;
	    case 2:
	      led->setScene(C);
	      break;
	     //add a case to each necessary letter
	}
    led->draw();
}