#include <SevSeg.h>
SevSeg sevseg;
#define MAX_NUMBER_STRINGS 12
#define MAX_STRING_SIZE 8
char testStrings[MAX_STRING_SIZE][MAX_STRING_SIZE];
#define PATTERN_CHANGE_TIME 1000
unsigned long timer = millis()-PATTERN_CHANGE_TIME;
byte testStringPos = 0;

void setup(){
  byte numDigits=4
  byte digitPins[]={2,3,4,5};
  byte segmentPins[]={6,7,8,9,10,11,12,13};
  bool resistorsOnSegments=false;
  byte hardwareConfig=COMMON_ANODE;
  bool updateWithDelays=false;
  bool leadingZeros=false;
  sevseg.begin(hardwareConfig,numDigits,digitPins,segmentPins,resistorsOnSegments,updateWithDelays,leadingZeros);
  sevseg.setBrightness(90);

  strcpy(testStrings[0],"A.B.");
  strcpy(testStrings[1], "....");
  
  strcpy(testStrings[2], ". ");
  strcpy(testStrings[3], ".");

  strcpy(testStrings[4], ".");

  strcpy(testStrings[5], ".");

  strcpy(testStrings[6], "ABC");

  strcpy(testStrings [7], "A.BCD");

  strcpy(testStrings[8], "A.B.CD");

  strcpy(testStrings[9], "A.B.C.D");

  strcpy(testStrings [10], "A.B.C.D.");

  strcpy(testStrings[11], "....");
}

void loop(){
  if (millis() > (timer + PATTERN_CHANGE_TIME)) {

  sevseg.setChars(testStrings[testStringsPos]);

  testStringsPos++;

if (testStringsPos >= MAX_NUMBER_STRINGS) testStringsPos = 0;

timer = millis();
  }

sevseg refreshDisplay(); // Must run repeatedly
}