mbp12

// required libraries
#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

// define matrix object
Adafruit_8x8matrix matrix = Adafruit_8x8matrix();

int y, z;

void setup() 
{
  // start the matrix at I2C address - default is 0x70
  matrix.begin(0x70);  // pass in the address
}

void loop()
{
  // circles
  for (y=0; y<5; y++)
  {
    for (z=0; z<8; z++)
    {
      matrix.clear();
      matrix.drawCircle(3,3, z, LED_ON);
      matrix.writeDisplay();  // write the changes we just made to the display
      delay(100);
    }
  }

  for (y=0; y<=5; y++)
  {
    // rectangles
    matrix.clear();
    matrix.drawRect(0, 0, 4, 4, LED_ON);
    matrix.writeDisplay();  // write the changes we just made to the display
    delay(250);
    matrix.clear();
    matrix.drawRect(4, 0, 4, 4, LED_ON);
    matrix.writeDisplay();  // write the changes we just made to the display
    delay(250);
    matrix.clear();
    matrix.fillRect(4, 4, 7, 7, LED_ON);
    matrix.writeDisplay();  // write the changes we just made to the display
    delay(250);
    matrix.clear();
    matrix.fillRect(0, 4, 4, 7, LED_ON);
    matrix.writeDisplay();  // write the changes we just made to the display
    delay(250);
  }
}