Simple countdown for Arduino using 7 segment display with HT16K33 backpack

simpleCountDown7SegmentArduino.ino

#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

Adafruit_7segment matrix = Adafruit_7segment();
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("7 Segment Backpack Test");

  matrix.begin(0x70);

}

void loop() {
  // put your main code here, to run repeatedly:

  boolean drawDots = true;
  for (int counter = 10; counter >=0; counter--) {
    matrix.drawColon(drawDots);
    matrix.writeDisplay();
    delay(10);
    matrix.print(counter);
    matrix.writeDisplay();
    delay(500);
  }
}