#include <LedControl.h>

// Define the pins for the first matrix
const int DIN = 11;
const int CS = 10;
const int CLK = 13;

// Define the number of matrices in the series
const int NUM_MATRICES = 2;

// Create an instance of the LedControl class
LedControl lc = LedControl(DIN, CLK, CS, NUM_MATRICES);

void setup() {
  // Initialize all matrices
  for (int i = 0; i < NUM_MATRICES; i++) {
    lc.shutdown(i, false);
    lc.setIntensity(i, 8);
    lc.clearDisplay(i);
  }
}

void loop() {
  // Display a smiley face on the first matrix
  lc.setRow(0, 0, B00000100);
  lc.setRow(0, 1, B00001110);
  lc.setRow(0, 2, B00000100);
  lc.setRow(0, 3, B00000000);
  lc.setRow(0, 4, B00001110);
  lc.setRow(0, 5, B00001110);
  lc.setRow(0, 6, B00001110);
  lc.setRow(0, 7, B00000000);

  // Display a sad face on the second matrix
  lc.setRow(1, 0, B01110000);
  lc.setRow(1, 1, B01110000);
  lc.setRow(1, 2, B01110000);
  lc.setRow(1, 3, B00000000);
  lc.setRow(1, 4, B01110000);
  lc.setRow(1, 5, B01110000);
  lc.setRow(1, 6, B01110000);
  lc.setRow(1, 7, B00000000);
  // Wait for a second
  delay(1000);
}