#include "SevSeg.h"

const byte numDigits = 1;
// Single digit uses one digit pin
const byte digitPins[] = {4};
// A, B, C, D, E, F, G, DP
const byte segmentPins[] = {11, 12, 6, 7, 8, 10, 9, 5};
const bool resistorsOnSegments = false;
const bool updateWithDelays = false;
const bool leadingZeros = false;
const byte hardwareConfig = COMMON_ANODE;

int number = 0;
unsigned long previousMillis = 0;

SevSeg sevseg;

void setup() {
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins,
               resistorsOnSegments, updateWithDelays, leadingZeros);
  sevseg.setBrightness(90);
}

void loop() {
  if (millis() - previousMillis >= 1000) {
    previousMillis = millis();

    number++;
    if (number > 9)
      number = 0;
  }

  sevseg.setNumber(number);
  sevseg.refreshDisplay();
}