#define COM_DIG1 15
#define COM_DIG2 16
#define COM_DIG3 17

#define SEV_A 2
#define SEV_B 5
#define SEV_C 22
#define SEV_D 19
#define SEV_E 18
#define SEV_F 4
#define SEV_G 23
#define SEV_DP 21

#include "SevSeg.h"
SevSeg sevseg; //Instantiate a seven segment controller object

void setup() {
  byte numDigits = 3;
  byte digitPins[] = {COM_DIG1, COM_DIG2, COM_DIG3};
  byte segmentPins[] = {SEV_A, SEV_B, SEV_C, SEV_D, SEV_E, SEV_F, SEV_G, SEV_DP};
  bool resistorsOnSegments = false; // 'false' means resistors are on digit pins
  byte hardwareConfig = COMMON_CATHODE; // See README.md for options
  bool updateWithDelays = false; // Default 'false' is Recommended
  bool leadingZeros = false; // Use 'true' if you'd like to keep the leading zeros
  bool disableDecPoint = false; // Use 'true' if your decimal point doesn't exist or isn't connected

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

void loop() {
  static unsigned long timer = millis();
  static int deciSeconds = 0;

  if (millis() - timer >= 100) {
    timer += 100;
    deciSeconds++; // 100 milliSeconds is equal to 1 deciSecond

    if (deciSeconds == 10000) { // Reset to 0 after counting for 1000 seconds.
      deciSeconds=0;
    }
    sevseg.setNumber(deciSeconds, 0);
  }

  sevseg.refreshDisplay(); // Must run repeatedly
}