Xwork's Blog

En mi caso es "Siqueiros printer" (ignora el nombre es un arduino)

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO.Ports;
using System.Windows.Forms;
using System.Configuration;

namespace ClockView
{
	public partial class FrmMain : Form
	{
		private SerialPort Port = new SerialPort();

		private void ArduinoMessage(string Message)
		{
			try
			{
				Port.Write(Message);
			}
			catch (Exception e)
			{
				MessageBox.Show(e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}

		}

		public FrmMain()
		{
			InitializeComponent();
		}

		private void Form1_Load(object sender, EventArgs e)
		{
			string[] Ports = SerialPort.GetPortNames();
			CboPorts.Items.AddRange(Ports);
			Port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
		}

		private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
		{
			SerialPort sp = (SerialPort)sender;
			string indata = sp.ReadExisting();
			if (indata == "Done")
			{

			}
		}
		private void BtnConnect_Click(object sender, EventArgs e)
		{
			try
			{
				if (Port.IsOpen == false)
				{
					Port.BaudRate = int.Parse(TxtSpeed.Text);
					Port.PortName = CboPorts.Text;
					Port.Parity = Parity.None;
					Port.StopBits = StopBits.One;
					Port.Parity = Parity.Even;
					Port.DataBits = 8;
					Port.Open();

				}				
			} catch (Exception ex) {
				MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
		}

		private void BtnDisconnect_Click(object sender, EventArgs e)
		{
			if (Port.IsOpen == true)
			{
				Port.Close();
			}
		}

		private void Btn1224_Click(object sender, EventArgs e)
		{
			ArduinoMessage(">SETF");
		}

		private void BtnShowSeconds_Click(object sender, EventArgs e)
		{
			ArduinoMessage(">DISS");
		}

		private void BtnLights_Click(object sender, EventArgs e)
		{
			ArduinoMessage(">SCRA");
		}

		private void trkbarBrillo_MouseUp(object sender, MouseEventArgs e)
		{
			ArduinoMessage(">SETB" + trkbarBrillo.Value.ToString());
		}

		private void BtnSync_Click(object sender, EventArgs e)
		{
			//>SETH2016122119001004
			string HourData = string.Concat(">SETH", DateTime.Now.Year, DateTime.Now.Month.ToString("D2"), DateTime.Now.Day.ToString("D2"),
				DateTime.Now.Hour.ToString("D2"), DateTime.Now.Minute.ToString("D2"), DateTime.Now.Second.ToString("D2"),
				(((int)DateTime.Now.DayOfWeek)+1).ToString("D2"));
			ArduinoMessage(HourData);

		}
	}
}

El código.

package com.mdev.clockview;

import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Handler;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import java.lang.reflect.Method;
import java.util.Set;
import java.util.Calendar;

import static com.mdev.clockview.R.layout.paired_devices_list;

public class MainActivity extends Activity {

	BluetoothAdapter myBluetoothAdapter = null;
	Button BtnConnect, BtnOnOff, BtnSecondsShow, BtnSyncHour, BtnChangeFormat,BtnDisconnect;
	SeekBar SkBright;
	TextView TxtArduinoRec, TxtBrigthValue;

	String address = null;
	private ProgressDialog progress;
	BluetoothSocket btSocket = null;
	private boolean isBtConnected = false;
	private static final UUID myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
	final int RECEIVE_MESSAGE = 1;
	private StringBuilder sb = new StringBuilder();
	private ConnectedThread mConnectedThread;
	Handler h;

	private Set<BluetoothDevice> pairedDevices;
	ListView myListView;
	ArrayAdapter BTArrayAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
		setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
		BtnConnect = (Button)findViewById(R.id.BtnConnect);
		myListView = (ListView)findViewById(R.id.BTList);
		TxtArduinoRec = (TextView)findViewById(R.id.TxtArduinoReturn);
		BtnOnOff = (Button)findViewById(R.id.BtnOn);
		BtnSecondsShow = (Button)findViewById(R.id.BtnShowS);
		BtnSyncHour = (Button)findViewById(R.id.BtnSync);
		BtnChangeFormat = (Button)findViewById(R.id.BtnFormat);
		BtnDisconnect = (Button)findViewById(R.id.BtnDisconnect);
		SkBright = (SeekBar)findViewById(R.id.SKBrillo);
		TxtBrigthValue = (TextView)findViewById(R.id.txtSeekValue);

		myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

		if (myBluetoothAdapter == null) {
			msg("El bluetooth no es soportado por este dispositivo");
		}
		else {
			msg("Esperando la conexion");
		}
		SkBright.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,
										  boolean fromUser) {
				TxtBrigthValue.setText(String.valueOf(progress));
				if (isBtConnected)
				{
					String result = String.format(">SETB%1$02d", progress);
					mConnectedThread.write(result);
				}
			}

			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
			}

			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {

			}
		});
		BtnConnect.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View view) {
				if (!myBluetoothAdapter.isEnabled()) {
					Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
					startActivityForResult(turnOnIntent, 1);
				}else{
					showBTDialog();
				}
			}
		});
		BtnOnOff.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View view){
				if (isBtConnected)
				{
					mConnectedThread.write(">SCRA");
				}
			}
		});

		BtnSecondsShow.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View view){
				if (isBtConnected)
				{
					mConnectedThread.write(">DISS");
				}
			}
		});

		BtnSyncHour.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View view){
				if (isBtConnected)
				{
					mConnectedThread.write(BuildHourToArduino());
				}
			}
		});

		BtnChangeFormat.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View view){
				if (isBtConnected)
				{
					mConnectedThread.write(">SETF");
				}
			}
		});
		
		BtnDisconnect.setOnClickListener(new View.OnClickListener()
		{
			@Override
			public void onClick(View view){
				if (isBtConnected)
				{
					Disconnect();
				}
			}
		});
		//encargado de procesar los mensajes.
		h = new Handler() {
			public void handleMessage(android.os.Message msg) {
				switch (msg.what)
				{
					case RECEIVE_MESSAGE:
						byte[] readBuf = (byte[]) msg.obj;
						String strIncom = new String(readBuf, 0, msg.arg1);
						sb.append(strIncom);
						int endOfLineIndex = sb.indexOf("\r\n");
						if (endOfLineIndex > 0)
						{
							String sbprint = sb.substring(0, endOfLineIndex);
							sb.delete(0, sb.length());
							TxtArduinoRec.setText("Data from Arduino: " + sbprint);
						}
						break;
				}
			};
		};

	}
	private void msg(String s)
	{
		Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
	}
	private String BuildHourToArduino(){
		//>SETH2016122119001004
		//>SETHAAAAMMDDHHMMSSWW
		Calendar c = Calendar.getInstance();
		int DiaSemana = c.get(Calendar.DAY_OF_WEEK);
		int Anio = c.get(Calendar.YEAR);
		int Mes = c.get(Calendar.MONTH);
		int Dia = c.get(Calendar.DAY_OF_MONTH);
		int Horas = c.get(Calendar.HOUR_OF_DAY);
		int Minutos = c.get(Calendar.MINUTE);
		int Segundos = c.get(Calendar.SECOND);

		String DateForArduino = String.format(">SETH%1$04d%2$02d%3$02d%4$02d%5$02d%6$02d%7$02d",
				Anio, Mes + 1, Dia, Horas, Minutos,Segundos, DiaSemana);
		msg(DateForArduino);

		return DateForArduino;
	}

	private void Disconnect()
	{
		if (btSocket!=null)
		{
			try
			{
				btSocket.close();
				isBtConnected = false;
			}
			catch (IOException e)
			{ msg("Error");}
		}
	}

	private AdapterView.OnItemClickListener myListClickListener = new AdapterView.OnItemClickListener()
	{
		public void onItemClick (AdapterView<?> av, View v, int arg2, long arg3) {
			if (myBluetoothAdapter.isEnabled()) {
				String info = ((TextView) v).getText().toString();
				address = info.substring(info.length() - 17);
				msg(address);

			} else {
				msg("El Bluetooth debe de estar encendido.");
			}
		}
	};


	public void showBTDialog() {
		final AlertDialog.Builder popDialog = new AlertDialog.Builder(this);
		final LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
		final View Viewlayout = inflater.inflate(paired_devices_list, (ViewGroup) findViewById(R.id.bt_list));

		popDialog.setTitle("Dispositivos Bluetooth:");
		popDialog.setView(Viewlayout);

		myListView = (ListView) Viewlayout.findViewById(R.id.BTList);
		BTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
		myListView.setAdapter(BTArrayAdapter);
		pairedDevices = myBluetoothAdapter.getBondedDevices();

		for(BluetoothDevice device : pairedDevices)
			BTArrayAdapter.add(device.getName()+ "\n" + device.getAddress());

		myListView.setOnItemClickListener(myListClickListener);
		// Button OK
		popDialog.setPositiveButton("Conectar",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						if (address != null)
						{
							new ConnectBT().execute();
						}
						dialog.dismiss();
					}
				});
		popDialog.create();
		popDialog.show();

	}
	private class ConnectedThread extends Thread {
		private final InputStream mmInStream;
		private final OutputStream mmOutStream;

		public ConnectedThread(BluetoothSocket socket) {
			InputStream tmpIn = null;
			OutputStream tmpOut = null;
			try {
				tmpIn = socket.getInputStream();
				tmpOut = socket.getOutputStream();
			} catch (IOException e) { }

			mmInStream = tmpIn;
			mmOutStream = tmpOut;
		}

		public void run() {
			byte[] buffer = new byte[256];
			int bytes;
			while (true) {
				try {
					bytes = mmInStream.read(buffer);
					h.obtainMessage(RECEIVE_MESSAGE, bytes, -1, buffer).sendToTarget();
				} catch (IOException e) {
					break;
				}
			}
		}

		public void write(String message) {
			byte[] msgBuffer = message.getBytes();
			try {
				mmOutStream.write(msgBuffer);
			} catch (IOException e) {
				msg("Error al enviar: " + e.getMessage());

			}
		}
	}



	private class ConnectBT extends AsyncTask<Void, Void, Void>
	{
		private boolean ConnectSuccess = true;

		@Override
		protected void onPreExecute()
		{
			progress = ProgressDialog.show(MainActivity.this, "Conectando...", "Espera...!!!");
		}

		@Override
		protected Void doInBackground(Void... devices)
		{
			try
			{
				if (btSocket == null || !isBtConnected)
				{
					myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
					BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
					BluetoothDevice dispositivo = myBluetoothAdapter.getRemoteDevice(address);
					btSocket = createBluetoothSocket(dispositivo);
					btSocket.connect();
				}
			}
			catch (IOException e)
			{
				ConnectSuccess = false;
			}
			return null;
		}

		private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
			if(Build.VERSION.SDK_INT >= 10){
				try {
					final Method  m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
					return (BluetoothSocket) m.invoke(device, myUUID);
				} catch (Exception e) {
					msg("No se pudo crear la conexion");
				}
			}
			return  device.createRfcommSocketToServiceRecord(myUUID);
		}

		@Override
		protected void onPostExecute(Void result)
		{
			super.onPostExecute(result);

			if (!ConnectSuccess)
			{
				msg("La conexion falló, intentelo de nuevo");
				isBtConnected = false;
			}
			else
			{
				msg("Conectado.");
				isBtConnected = true;
				mConnectedThread = new ConnectedThread(btSocket);
				mConnectedThread.start();
			}
			progress.dismiss();
		}
	}
}

1. 1 Módulo bluetooth H06.
2. 1 Módulo de tarjeta lector de tarjeta SD.

Módulo bluetooth HC06, se puede conseguir por un par de dolares.

//Clockview 1.0
#include <DS1302.h>
#include "LedControl.h"
#include <SD.h>
/*
 Para la conexión del modulo SD se siguen los siguientes:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 10 - Este es el que se puede cambiar
*/
//Pin SD
int CS_PIN = 10;
//Constantes para los pines usados en la matriz
const int MaxDIn = 9;
const int MaxCS = 8;
const int MaxCLK = 7;
int MaxNDevices = 3;
bool IsConnected = false;
//Constantes para los pines usados en el reloj
const int kCePin = 6;  // RST
const int kIoPin = 5;  // Dat
const int kSclkPin = 4;  // Serial Clock
//Inicializacion de la matriz
//DIN,CLK,CS
LedControl lc = LedControl(MaxDIn, MaxCLK, MaxCS, MaxNDevices);
//Inicializacion del reloj
DS1302 rtc(kCePin, kIoPin, kSclkPin);
//Algunas variables
File Archivo;
char Texto[24];
int MatrixB = 10;
bool H24 = true;
bool HalfSecond = true;
bool IsScreenEnable = true;
bool ShowSeconds = true;
bool SDCardReady = false;
//Matriz con los "Numeros"
const unsigned char Numbers[] = {
 B111110, B100010, B111110, //0
 B100100, B111110, B100000, //1
 B111010, B101010, B101110, //2
 B100010, B101010, B111110, //3
 B001110, B001000, B111110, //4
 B101110, B101010, B111010, //5
 B111110, B101010, B111010, //6
 B000010, B000010, B111110, //7
 B111110, B101010, B111110, //8
 B001110, B001010, B111110, //9
 B111110, B001010, B001110, //A - 10
 B111110, B001100, B111110, //M - 11
 B111110, B001010, B001110, //P - 12
 B111110, B001000, B111110, //H - 13
 B111110 ,B011010, B101110, //R - 14
};
//Definimos simbolos
const unsigned char Symbols[] = {
 B0100010, B0010100, B0001000, B1111111, B0101010, B0010100, //BT 0
 B0011110, B0100011, B0101101, B0100101, B0100101, B0011110, //Clock Adjust 1
 
};
//Imprimir simbolos
void PrintSymbol(byte Index,byte SymDevice){
 for (int Y = 1; Y < 7; Y++){
  lc.setRow(SymDevice, Y, Symbols[Index * 5 + Y - 1]);
 }
}
//Funcion para escribir los numero en la matriz.
void PrintNumber(byte NumberOne, byte NumberTwo, byte Device){
 for (int X = 1; X < 8; X++){
  if (X < 4){
   lc.setRow(Device, X, Numbers[NumberOne * 3 + X - 1]);
  }
  if (X == 4){
   lc.setRow(Device, 4, 0);
  }
  if (X > 4){
   lc.setRow(Device, X, Numbers[NumberTwo * 3 + X - 5]);
  }
 }
}
//Imprimir el tiempo en las matrices y en el monitor serie
void printTime(){
 Time t = rtc.time();
 const String day = dayAsString(t.day);
 char buf[50];
 snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
  day.c_str(), t.yr, t.mon, t.date, t.hr, t.min, t.sec);
 PrintNumber(AdjustTime(t.hr, H24) / 10,AdjustTime(t.hr, H24) % 10, 0);
 PrintNumber(t.min / 10, t.min % 10, 1);
 if (ShowSeconds){
  PrintNumber(t.sec / 10, t.sec % 10, 2); 
 }else{
  if(H24)
   PrintNumber(13, 14, 2);
  if(!H24 && (t.hr-12) < 13)
   PrintNumber(10, 11, 2);
  if(!H24 && (t.hr-12) > 12)
   PrintNumber(10, 12, 2);
 }
 //PrintSymbol(0, 2);
 if (HalfSecond == true){
  digitalWrite(3, HIGH);
  HalfSecond = false;
 }else{
  digitalWrite(3, LOW);
  HalfSecond = true;
 }
 Serial.println(buf);
}
//Ajustar la hora
int AdjustTime(int Hour, bool In24Hformat){
 if(In24Hformat == true){
  return Hour;
 }
 if(In24Hformat == false && Hour > 12){
  Hour = Hour - 12;
  return Hour;
 }else{
  return Hour;
 }
}
void SaveSettings(){
 Archivo = SD.open("Settings.clv", O_WRITE | O_CREAT);
 char SaveBuf[8];
 snprintf(SaveBuf, sizeof(SaveBuf), "%s%02d",">SETB", MatrixB);
 Serial.println(SaveBuf);
 if (Archivo){
  Archivo.seek(0);
  Archivo.println(SaveBuf);
  if(H24)
   Archivo.println(">SETF");
  else
   Archivo.println("XSETF");
  if (ShowSeconds)
   Archivo.println(">DISS");
  else
   Archivo.println("XDISS");
  Archivo.flush();
  Archivo.close();
  Serial.println("Guardado");
 } else {
  Serial.println("error writing test.txt");
 }
}
//Cargar los ajustes
void LoadSettings(){
 Archivo = SD.open("Settings.clv", FILE_READ);
 int B = 0;
 byte CurRead;
 char SettBuf[22];
 if (Archivo) {
  while (Archivo.available() > 0){
   CurRead = Archivo.read();
   if (CurRead != 10 && CurRead != 13){
    SettBuf[B] = CurRead;
    B++;
    Serial.print(B);
   }else{
    CheckPetition(SettBuf, false);
    Serial.print(B);
    B = 0;
    for (int BF = 0; BF < 22; BF++)
     SettBuf[BF]=0;
   }
  }
  Archivo.close();
 }else{
  Serial.println("error opening file");
 } 
}
//Comprobar que si hay algun comando
void CheckPetition(char DATA[], bool Save){
 int i = 0;
 int j = 0;
 String Texto(DATA);
 //>SETH2016122119001004
 if (Texto.startsWith(">DISS")){
  ShowSeconds = !ShowSeconds;
  if (Save)
   SaveSettings();
  Serial.print("No/Se muestran los segundos");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.shutdown(CurrentDevice, !IsScreenEnable);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 if (Texto.startsWith(">SCRA")){
  IsScreenEnable = !IsScreenEnable;
  Serial.print("Las matrices se apagaron/encendieron");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.shutdown(CurrentDevice, !IsScreenEnable);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 } 
 if (Texto.startsWith(">RESET")){
  SD.remove("Settings.clv");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.shutdown(CurrentDevice, !IsScreenEnable);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 } 
 if (Texto.startsWith(">SETF")){
  H24 = !H24;
  if (Save)
   SaveSettings();
  Serial.print("EL reloj cambio de formato 12H-24H");
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 if (Texto.startsWith(">SETH")){
  AdjustTime(Texto.substring(9, 5).toInt(),Texto.substring(11,9).toInt(),Texto.substring(13, 11).toInt(),
  Texto.substring(15, 13).toInt(), Texto.substring(17, 15).toInt(), Texto.substring(19, 17).toInt(),
  Texto.substring(21, 19).toInt());
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 if (Texto.startsWith(">SETB")){
  MatrixB = Texto.substring(5).toInt();
  if (Save)
   SaveSettings();
  Serial.println("El brillo se cambio");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.setIntensity(CurrentDevice, MatrixB);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 else {
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
}
//Convertir los dias
String dayAsString(const Time::Day day){
 switch (day){
  case Time::kSunday: return "DOM";
  case Time::kMonday: return "LUN";
  case Time::kTuesday: return "MAR";
  case Time::kWednesday: return "MIE";
  case Time::kThursday: return "JUE";
  case Time::kFriday: return "VIE";
  case Time::kSaturday: return "SAB";
 }
 return "(unknown day)";
}
//Ajustar la hora
void AdjustTime(int Year,int Month, int Day, int Hour, int Minute, int Second, int DayOfWeek){
 Time::Day CurrentDay;
 switch (DayOfWeek){
  case 1:
   CurrentDay = Time::kSunday;
   break;
  case 2:
   CurrentDay = Time::kMonday;
   break;
  case 3:
   CurrentDay = Time::kTuesday;
   break;
  case 4:
   CurrentDay = Time::kWednesday;
   break;
  case 5:
   CurrentDay = Time::kThursday;
   break;
  case 6:
   CurrentDay = Time::kFriday;
   break;
  case 7:
   CurrentDay = Time::kSaturday;
   break;
 }
 //Esta parte se usa para actualizar la hora.
 rtc.writeProtect(false);
 rtc.halt(false);
 Time t(Year, Month, Day, Hour, Minute, Second, CurrentDay);
 rtc.time(t); 
}
//Inicializar la tarjeta SD para usarla
void InitializeSD(){
 pinMode(CS_PIN, OUTPUT);
 if (SD.begin()){
  SDCardReady = true;
  Serial.println("La tarjeta SD esta lista");
 }else{
  SDCardReady = false;
  Serial.println("La tarjeta SD no esta lista");
  return;
 }
}
//Setup
void setup(){
 Serial.begin(9600);
 for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
  lc.shutdown(CurrentDevice, false);
  lc.setIntensity(CurrentDevice, MatrixB);
  lc.clearDisplay(CurrentDevice);
 }
 InitializeSD();
 pinMode(3, OUTPUT);
 if(SDCardReady){
  LoadSettings();
 }else{
  Serial.println("La tarjeta no está lista");
 }
}
//Loop
void loop(){
 int i = 0;
 printTime();
 delay(500);
 if (Serial.available()) {
  while (Serial.available() > 0) {
   Texto[i] = Serial.read();
   i++;
  }
  Texto[i] = '\0';
 }
 CheckPetition(Texto, true);
}

//Clockview 1.0
#include <DS1302.h>
#include "LedControl.h"
//Constantes para los pines usados en la matriz
const int MaxDIn = 12;
const int MaxCS = 11;
const int MaxCLK = 10;
int MaxNDevices = 3;
bool IsConnected = false;
//Constantes para los pines usados en el reloj
const int kCePin = 7;  // RST
const int kIoPin = 8;  // Dat
const int kSclkPin = 9;  // Serial Clock
//Inicializacion de la matriz
//DIN,CLK,CS
LedControl lc = LedControl(MaxDIn, MaxCLK, MaxCS, MaxNDevices);
//Inicializacion del reloj
DS1302 rtc(kCePin, kIoPin, kSclkPin);
//Algunas variables
char Texto[24];
int MatrixB = 4;
bool H24 = true;
bool HalfSecond = true;
bool IsScreenEnable = true;
bool ShowSeconds = true;
//Matriz con los "Numeros"
const unsigned char Numbers[] = {
 B111110, B100010, B111110, //0
 B100100, B111110, B100000, //1
 B111010, B101010, B101110, //2
 B100010, B101010, B111110, //3
 B001110, B001000, B111110, //4
 B101110, B101010, B111010, //5
 B111110, B101010, B111010, //6
 B000010, B000010, B111110, //7
 B111110, B101010, B111110, //8
 B001110, B001010, B111110, //9
 B111110, B001010, B001110, //A
 B111110, B001100, B111110, //M
 B111110, B001010, B001110, //P
 B111110, B001000, B111110, //H
 B111110 ,B011010, B101110, //R
};
//Definimos simbolos
const unsigned char Symbols[] = {
 B0100010, B0010100, B0001000, B1111111, B0101010, B0010100, //BT 0
 B0011110, B0100011, B0101101, B0100101, B0100101, B0011110, //Clock Adjust 1
 
};
//Imprimir simbolos
void PrintSymbol(byte Index,byte SymDevice){
 for (int Y = 1; Y < 7; Y++){
  lc.setRow(SymDevice, Y, Symbols[Index * 5 + Y - 1]);
 }
}
//Funcion para escribir los numero en la matriz.
void PrintNumber(byte NumberOne, byte NumberTwo, byte Device){
 for (int X = 1; X < 8; X++){
  if (X < 4){
   lc.setRow(Device, X, Numbers[NumberOne * 3 + X - 1]);
  }
  if (X == 4){
   lc.setRow(Device, 4, 0);
  }
  if (X > 4){
   lc.setRow(Device, X, Numbers[NumberTwo * 3 + X - 5]);
  }
 }
}
//Imprimir el tiempo en las matrices y en el monitor serie
void printTime(){
 Time t = rtc.time();
 const String day = dayAsString(t.day);
 char buf[50];
 snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
  day.c_str(), t.yr, t.mon, t.date, t.hr, t.min, t.sec);
 PrintNumber(AdjustTime(t.hr, H24) / 10,AdjustTime(t.hr, H24) % 10, 0);
 PrintNumber(t.min / 10, t.min % 10, 1);
 if (ShowSeconds){
  PrintNumber(t.sec / 10, t.sec % 10, 2); 
 }else{
  if(H24)
   PrintNumber(13, 14, 2);
  if(!H24 && (t.hr-12) < 13)
   PrintNumber(10, 11, 2);
  if(!H24 && (t.hr-12) > 12)
   PrintNumber(10, 12, 2);
 }
 //PrintSymbol(0, 2);
 if (HalfSecond == true){
  digitalWrite(13, HIGH);
  HalfSecond = false;
 }else{
  digitalWrite(13, LOW);
  HalfSecond = true;
 }
 Serial.println(buf);
}
//Ajustar la hora
int AdjustTime(int Hour, bool In24Hformat){
 if(In24Hformat == true){
  return Hour;
 }
 else{
  Hour = Hour - 12;
  return Hour;
 }
}
void CheckPetition(char DATA[]){
 int i = 0;
 int j = 0;
 String Texto(DATA);
 //>SETH2016121221001007
 //Bright = Texto.substring(4).toInt();
 //MatrixB
 if (Texto.startsWith(">DISS")){
  ShowSeconds = !ShowSeconds;
  Serial.print("No/Se muestran los segundos");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.shutdown(CurrentDevice, !IsScreenEnable);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 if (Texto.startsWith(">SCRA")){
  IsScreenEnable = !IsScreenEnable;
  Serial.print("Las matrices se apagaron/encendieron");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.shutdown(CurrentDevice, !IsScreenEnable);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 } 
 if (Texto.startsWith(">SETF")){
  H24 = !H24;
  Serial.print("EL reloj cambio de formato 12H-24H");
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 } 
 if (Texto.startsWith(">SETH")){
  AdjustTime(Texto.substring(9, 5).toInt(),Texto.substring(11,9).toInt(),Texto.substring(13, 11).toInt(),
  Texto.substring(15, 13).toInt(), Texto.substring(17, 15).toInt(), Texto.substring(19, 17).toInt(),
  Texto.substring(21, 19).toInt());
  Serial.print("La hora se ajusto.");
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 if (Texto.startsWith(">SETB")){
  MatrixB = Texto.substring(5).toInt();
  Serial.print("El brillo se cambio");
  for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
   lc.setIntensity(CurrentDevice, MatrixB);
  }
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
 else {
  for (j = 0; j < 11; j++) {
   DATA[j] = 0;
  }
  i = 0;
 }
}
//Convertir los dias
String dayAsString(const Time::Day day){
 switch (day){
  case Time::kSunday: return "DOM";
  case Time::kMonday: return "LUN";
  case Time::kTuesday: return "MAR";
  case Time::kWednesday: return "MIE";
  case Time::kThursday: return "JUE";
  case Time::kFriday: return "VIE";
  case Time::kSaturday: return "SAB";
 }
 return "(unknown day)";
}
//Ajustar la hora
void AdjustTime(int Year,int Month, int Day, int Hour, int Minute, int Second, int DayOfWeek){
 Time::Day CurrentDay;
 switch (DayOfWeek){
  case 1:
   CurrentDay = Time::kSunday;
   break;
  case 2:
   CurrentDay = Time::kMonday;
   break;
  case 3:
   CurrentDay = Time::kTuesday;
   break;
  case 4:
   CurrentDay = Time::kWednesday;
   break;
  case 5:
   CurrentDay = Time::kThursday;
   break;
  case 6:
   CurrentDay = Time::kFriday;
   break;
  case 7:
   CurrentDay = Time::kSaturday;
   break;
 }
 //Esta parte se usa para actualizar la hora.
 rtc.writeProtect(false);
 rtc.halt(false);
 Time t(Year, Month, Day, Hour, Minute, Second, CurrentDay);
 rtc.time(t); 
}
//Setup
void setup(){
 for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++){
  lc.shutdown(CurrentDevice, false);
  lc.setIntensity(CurrentDevice, MatrixB);
  lc.clearDisplay(CurrentDevice);
 }
 pinMode(13, OUTPUT);
 Serial.begin(9600);
}
//Loop
void loop(){
 int i = 0;
 printTime();
 delay(500);
 if (Serial.available()) {
  while (Serial.available() > 0) {
   Texto[i] = Serial.read();
   i++;
  }
  Texto[i] = '\0';
 }
 CheckPetition(Texto);
}

La opción de 24 horas y la opción de "No mostrar los segundos" activos.

La opción de 24 horas no está activa y la opción de no mostrar los segundos tampoco.

//Imprimir simbolos
void PrintSymbol(byte Index,byte SymDevice){
 for (int Y = 1; Y < 7; Y++){
  lc.setRow(SymDevice, Y, Symbols[Index * 5 + Y - 1]);
 }
}

//Imprimir el tiempo en las matrices y en el monitor serie
void printTime(){
 Time t = rtc.time();
 const String day = dayAsString(t.day);
 char buf[50];
 snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
  day.c_str(), t.yr, t.mon, t.date, t.hr, t.min, t.sec);
 PrintNumber(AdjustTime(t.hr, H24) / 10,AdjustTime(t.hr, H24) % 10, 0);
 PrintNumber(t.min / 10, t.min % 10, 1);
 if (ShowSeconds){
  PrintNumber(t.sec / 10, t.sec % 10, 2); 
 }else{
  if(H24)
   PrintNumber(13, 14, 2);
  if(!H24 && (t.hr-12) < 13)
   PrintNumber(10, 11, 2);
  if(!H24 && (t.hr-12) > 12)
   PrintNumber(10, 12, 2);
 }
 //PrintSymbol(0, 2);
 if (HalfSecond == true){
  digitalWrite(13, HIGH);
  HalfSecond = false;
 }else{
  digitalWrite(13, LOW);
  HalfSecond = true;
 }
 Serial.println(buf);
}

1. Un arduino Uno/Mega/Nano.
2. Un protoboard.
3. Dos o más matrices led con driver Max7219.
4. Modulo de reloj en tiempo real con DS1302.
5. Liberia "LedControl.h"
6. Liberia "DS1302.h"
7. Algunos cables jumper para hacer las conexiones.
8. Un par de manos (o en su defecto una).

Las conexiones.

El código en C.

//Clockview 1.0
#include <DS1302.h>
#include "LedControl.h"
//Constantes para los pines usados en la matriz
const int MaxDIn = 12;
const int MaxCS = 11;
const int MaxCLK = 10;
int MaxNDevices = 3;
//Constantes para los pines usados en el reloj
const int kCePin = 7;  // RST
const int kIoPin = 8;  // Dat
const int kSclkPin = 9;  // Serial Clock
//Inicializacion de la matriz
//DIN,CLK,CS
LedControl lc = LedControl(MaxDIn, MaxCLK, MaxCS, MaxNDevices);
//Inicializacion del reloj
DS1302 rtc(kCePin, kIoPin, kSclkPin);
//Algunas variables
int MatrixB = 1;
//Matriz con los "Numeros"
const unsigned char Numbers[] = {
 B11111, B10001, B11111, //0
 B10010, B11111, B10000, //1
 B11101, B10101, B10111, //2
 B10001, B10101, B11111, //3
 B00111, B00100, B11111, //4
 B10111, B10101, B11101, //5
 B11111, B10101, B11101, //6
 B00001, B00001, B11111, //7
 B11111, B10101, B11111, //8
 B00111, B00101, B11111, //9
 B11111, B00101, B00111, //A
 B11111, B01100, B11111, //M
 B11111, B00101, B00111, //P
};
//Funcion para escribir los numero en la matriz.
void PrintNumber(byte NumberOne, byte NumberTwo, byte Device){
 for (int X = 1; X < 8; X++){
  if (X < 4){
   lc.setRow(Device, X, Numbers[NumberOne * 3 + X - 1]);
  }
  if (X == 4){
   lc.setRow(Device, 4, 0);
  }
  if (X > 4){
   lc.setRow(Device, X, Numbers[NumberTwo * 3 + X - 5]);
  }
 }
}
//Imprimir el tiempo en las matrices y en el monitor serie
void printTime(){
 Time t = rtc.time();
 char buf[10];
 snprintf(buf, sizeof(buf), "%02d:%02d:%02d", t.hr, t.min, t.sec);
 PrintNumber(t.hr / 10, t.hr % 10, 0);
 PrintNumber(t.min / 10, t.min % 10, 1);
 PrintNumber(t.sec / 10, t.sec % 10, 2);
 Serial.println(buf);
}
//Convertir los dias
String dayAsString(const Time::Day day) {
 switch (day){
  case Time::kSunday: return "Sunday";
  case Time::kMonday: return "Monday";
  case Time::kTuesday: return "Tuesday";
  case Time::kWednesday: return "Wednesday";
  case Time::kThursday: return "Thursday";
  case Time::kFriday: return "Friday";
  case Time::kSaturday: return "Saturday";
 }
 return "(unknown day)";
}
//Setup
void setup(){
 for (int CurrentDevice = 0; CurrentDevice < MaxNDevices; CurrentDevice++)
 {
  lc.shutdown(CurrentDevice, false);
  lc.setIntensity(CurrentDevice, MatrixB);
  lc.clearDisplay(CurrentDevice);
 }
 Serial.begin(9600);
 //Esta parte se usa para actualizar la hora.
 //rtc.writeProtect(false);
 //rtc.halt(false);
 //Time t(2016, 12, 7, 23, 57, 00, Time::kWednesday);
 //rtc.time(t);
}
//Loop
void loop() {
 printTime();
 delay(1000);
}

void setLed(int addr, int row, int col, boolean state);

void setRow(int addr, int row, byte value);

Como lucirá el numero 25

Mostrando dígitos en las matrices.

Indice = NumeroDado * 3 +ValorDelIterador - 1

Indice = NumeroDado * 3 +ValorDelIterador - 5

Completando el resto del código.