En este original   proyecto  se trata de proteger una habitación de la bomba de sumidero  potencialmente peligrosa para los niños  asegurándose  de que las estancias quedan las  puertas cerradas y las personas (principalmente niños) no entran  en esta.

Las soluciones «alarma de la puerta» disponibles en el mercado parecen dirigidas a congeladores y simplemente no se adaptan a  necesidades mas complejas del autor   que pensaba mas bien  en una solución  con  Netduino.

La idea  original por tanto era algo que hiciera sonar  una alarma corta cuando se abriera la puerta y luego alertara a intervalos (cada pocos minutos), similar a un detector de humo con una batería que funcionase hasta agotar la batería o  hasta que la puerta se cerrase

La unidad controla la puerta a través de un interruptor magnético. Cuando se abre la puerta varias cosas suceden:

1.  La luz del techo se enciende con un relé que controla una carga de baja  tensión.
2.  Un servicio web se llama el cual envía un MMS a un teléfono.
3. Un contador de tiempo que  se activa qeu al concluir  producirá una alerta sonora y hara una  llamada webservice (MMS) si la puerta permanece abierta durante un periodo de tiempo determinado.

Cuando se cierra la puerta a la luz se apaga y el temporizador de la alarma se detiene. El proyecto también incorpora una pantalla LCD de 2 líneas para mensajes, 2 LEDs (1 para la energía, 1 para la indicación de modo de problemas / override) y algunos botones para interactuar con el sistema.

Las funcionalidades de esta alarma de puerta basada en Netduino pues son las siguientes :

•  Apaga/enciende  la luz : la enciende automáticamente cuando se abre la puerta y la apaga cuando la puerta está cerrada
•  Alarma del MMS al abrir la puerta (a través de llamadas de servicio web)
•  Alerta audible y alerta MMS adicional si la puerta se deja abierta más tiempo que  el  valor del temporizador
•  Alerta que se repiten a intervalos especificados si la puerta sigue dejándose abierta
• 4 botones :
  •  Botón 1: Manual de luz de encendido / apagado de anulación
  • – Botón 2: Regreso al control de forma automática la luz
  • – Botón 3: mensajes de error Revisión (principalmente para conexiones de red)
  • – Botón 4: Encender / apagar el sensor de la puerta (permite prolongado puerta abierta sin alerta)

Respecto al software para Netduino  se utilizan  cuatro clases :

Una clase para  dar soporte  a la comunicación de red:

public static class Network
{
public static bool NetworkAvail = false;
public static NetworkInterface ni = NetworkInterface.GetAllNetworkInterfaces()[0];

static NoteClass[] networkUpTune = {
new NoteClass(5,NoteClass.C, NoteClass.ThirtySecond),
new NoteClass(5,NoteClass.Rest, NoteClass.ThirtySecond),
new NoteClass(5,NoteClass.C, NoteClass.ThirtySecond),
new NoteClass(5,NoteClass.Rest, NoteClass.ThirtySecond),
new NoteClass(5,NoteClass.C, NoteClass.ThirtySecond)
};

static NoteClass[] networkDownTune = {
new NoteClass(3,NoteClass.C, NoteClass.ThirtySecond),
new NoteClass(3,NoteClass.Rest, NoteClass.ThirtySecond),
new NoteClass(3,NoteClass.C, NoteClass.ThirtySecond),
new NoteClass(3,NoteClass.Rest, NoteClass.ThirtySecond),
new NoteClass(3,NoteClass.C, NoteClass.ThirtySecond)
};

static NoteClass[] alertTune = {
new NoteClass(5,NoteClass.C, NoteClass.Eighth),
new NoteClass(6,NoteClass.C, NoteClass.Eighth),
new NoteClass(5,NoteClass.C, NoteClass.Eighth),
new NoteClass(6,NoteClass.C, NoteClass.Eighth)
};

public static void InitNetwork()
{
ParallaxLCD.Print(«Network…»);
int count = 0;
//DHCP can take a few seconds to finish so wait (up to 10 seconds) for it to complete
while (true)
{
count++;
ni = NetworkInterface.GetAllNetworkInterfaces()[0];
//only try for 10 seconds
if (ni.IPAddress != «0.0.0.0» || count > 10) break;
Thread.Sleep(1000);
}
if (ni.IPAddress == «0.0.0.0»)
{
ParallaxLCD.Print(«Network…\rError: Failed»);
}
else
{
ParallaxLCD.Print(«Network… IP:\r» + ni.IPAddress);
NetworkAvail = true;
}
//wire in event handler to keep track of the current network up/down state
NetworkChange.NetworkAvailabilityChanged += new NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);
}

static void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
{
NetworkAvail = e.IsAvailable;
if (Program.initializing)
return;
if (NetworkAvail)
{
ParallaxLCD.Play(networkUpTune);
}
else
{
ParallaxLCD.Play(networkDownTune);
}
}

public static void SendAlert()
{
if (NetworkAvail)
{
try
{
//HttpWebRequest
HttpWebRequest alertRequest = (HttpWebRequest)WebRequest.Create(Program.AlertWebService);
alertRequest.Method = «GET»;
HttpWebResponse alertResponse = (HttpWebResponse)alertRequest.GetResponse();
if (alertResponse.StatusCode != HttpStatusCode.OK)
{
Program.LastError = «(SendAlert) » + alertResponse.StatusCode.ToString() + «: » + alertResponse.StatusDescription;
ParallaxLCD.Play(alertTune);
}
}
catch (Exception e)
{
Program.LastError = «(SendAlert) » + e.Message;
ParallaxLCD.Play(alertTune);
}
}
else
{
Program.LastError = «(SendAlert) Network unavailable»;
ParallaxLCD.Play(alertTune);
}
}

}
}

La clase  para controlar el display LCD

//Non-visible characters (Decimal ASCII) used by the Parallax LCD as commands
public enum LCD_COMMAND_CHARS
{
PrintCustomChar0 = 0,
PrintCustomChar1 = 1,
PrintCustomChar2 = 2,
PrintCustomChar3 = 3,
PrintCustomChar4 = 4,
PrintCustomChar5 = 5,
PrintCustomChar6 = 6,
PrintCustomChar7 = 7,
Backspace = 8,
Right = 9,
LineFeed = 10,
FormFeed = 12, //clears display and sets cursor to row 0 column 0
CR = 13,
BacklightOn = 17,
BacklightOff = 18,
DisplayOff = 21,
DisplayOn_NoCursor_NoBlink = 22,
DisplayOn_NoCursor_CharBlink = 23,
DisplayOn_Cursor_NoBlink = 24,
DisplayOn_Cursor_CharBlink = 25,
//Sound control
NoteLength_1_64 = 208,
NoteLength_1_32 = 209,
NoteLength_1_16 = 210,
NoteLength_1_8 = 211,
NoteLength_1_4 = 212,
NoteLength_1_2 = 213,
NoteLength_Whole = 214,
NoteScale_3 = 215,
NoteScale_4 = 216,
NoteScale_5 = 217,
NoteScale_6 = 218,
NoteScale_7 = 219,
Note_A = 220,
Note_A_Sharp = 221,
Note_B = 222,
Note_C = 223,
Note_C_Sharp = 224,
Note_D = 225,
Note_D_Sharp = 226,
Note_E = 227,
Note_F = 228,
Note_F_Sharp = 229,
Note_G = 230,
Note_G_Sharp = 231,
Note_Rest = 232,
LoadCustomChar0 = 248,
LoadCustomChar1 = 249,
LoadCustomChar2 = 250,
LoadCustomChar3 = 251,
LoadCustomChar4 = 252,
LoadCustomChar5 = 253,
LoadCustomChar6 = 254,
LoadCustomChar7 = 255
}

//This class assumes the Parallax LCD/speaker combo unit is connected to Netduino Plus Digital I/O PIN 3
//which is reserved for COM2 in the Netduino framework. Also assumes the Parallax LCD has been set to
//9600 baud using it’s onboard dip switches.
public static class ParallaxLCD
{
private static SerialPort LCD_PORT;
private static string COM_PORT = «COM2»; //Netduino Plus Digital I/O PIN 3
private static int COM_BAUD = 9600;

private static bool _LCD_state = false;

public static bool LCD
{
get
{
return _LCD_state;
}
set
{
if (value == _LCD_state)
{
//LCD already in specified state, don’t do anything
return;
}
if (value)
{
LCDOn();
BacklightOn();
}
else
{
BacklightOff();
LCDOff();
}
_LCD_state = value;
}
}
public static void Print(string inputstring)
{
//if the first line is >= 16 characters then remove the line break for a more natural behavior
int cr = inputstring.IndexOf(‘\r’, 0);
if (cr >= 16)
{
inputstring = inputstring.Substring(0, cr) + inputstring.Substring(cr + 1);
}
//this routine assumes all output will be «full screen», meaning no other data is left on the screen
ClearLCD();
byte[] bytes = UTF8Encoding.UTF8.GetBytes(inputstring);
LCD_PORT.Write(bytes, 0, bytes.Length);
}

public static void StartSerial()
{
LCD_PORT = new SerialPort(COM_PORT, COM_BAUD, Parity.None, 8, StopBits.One);
LCD_PORT.Open();
}

public static void BacklightOn()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.BacklightOn }, 0, 1);
}

public static void BacklightOff()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.BacklightOff }, 0, 1);
}

public static void ClearLCD()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.FormFeed }, 0, 1);
}

public static void LCDOff()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.DisplayOff }, 0, 1);
}

public static void LCDOn()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.DisplayOn_NoCursor_NoBlink }, 0, 1);
}

public static void LCDCR()
{
LCD_PORT.Write(new byte[] { (int)LCD_COMMAND_CHARS.CR }, 0, 1);
}

//Short, high-pitched sound to ack as notification that an action was detected (like a button press)
public static void Acknowledge()
{
Play(new NoteClass(7, NoteClass.A, NoteClass.ThirtySecond));
}

//Sound a traditional computer beep
public static void Beep()
{
Play(new NoteClass(5, NoteClass.A, NoteClass.Quarter));
}

public static void Play(NoteClass note)
{
byte[] sequence = new byte[3];
sequence[0] = (byte)note.ScaleChar;
sequence[1] = (byte)note.LengthChar;
sequence[2] = (byte)note.NoteChar;
LCD_PORT.Write(sequence, 0, 3);
}
public static void Play(NoteClass[] notes)
{
int currentScale = 0;
int currentLength = 0;
int count = 0;
if (notes != null && notes.Length > 0)
{
byte[] sequence = new byte[notes.Length * 3];
foreach (NoteClass note in notes)
{
if (note.ScaleChar != currentScale)
{
currentScale = note.ScaleChar;
sequence[count++] = (byte)currentScale;
}
if (note.LengthChar != currentLength)
{
currentLength = note.LengthChar;
sequence[count++] = (byte)currentLength;
}
sequence[count++] = (byte)note.NoteChar;
}
LCD_PORT.Write(sequence, 0, count);
}
}

public static byte[] CharsToBytes(char[] Input)
{
byte[] ReturnValue = new byte[Input.Length];

for (int Counter = 0; Counter < Input.Length; ++Counter)
{
ReturnValue[Counter] = (byte)Input[Counter];
}
return ReturnValue;
}

}
public class NoteClass
{
//Helper constants
public const int A = 0;
public const int ASharp = 1;
public const int B = 2;
public const int C = 3;
public const int CSharp = 4;
public const int D = 5;
public const int DSharp = 6;
public const int E = 7;
public const int F = 8;
public const int FSharp = 9;
public const int G = 10;
public const int GSharp = 11;
public const int Rest = 12;

public const int SixtyQuarter = (int)LCD_COMMAND_CHARS.NoteLength_1_64;
public const int ThirtySecond = (int)LCD_COMMAND_CHARS.NoteLength_1_32;
public const int Sixteenth = (int)LCD_COMMAND_CHARS.NoteLength_1_16;
public const int Eighth = (int)LCD_COMMAND_CHARS.NoteLength_1_8;
public const int Quarter = (int)LCD_COMMAND_CHARS.NoteLength_1_4;
public const int Half = (int)LCD_COMMAND_CHARS.NoteLength_1_2;
public const int Whole = (int)LCD_COMMAND_CHARS.NoteLength_Whole;

private int _scale = 5;
private int _note = A;
private int _length = Quarter;

public int Scale
{
get
{
return _scale;
}
set
{
if (value >= 3 && value <= 7)
{
_scale = value;
}
}
}
public int ScaleChar
{
get
{
return ((int)LCD_COMMAND_CHARS.NoteScale_3 – 3) + _scale;
}
}
public int Note
{
get
{
return _note;
}
set
{
if (value >= A && value <= Rest)
{
_note = value;
}
}
}
public int NoteChar
{
get
{
return (int)LCD_COMMAND_CHARS.Note_A + _note;
}
}
public int Length
{
get
{
return _length;
}
set
{
if (value >= SixtyQuarter && value <= Whole)
{
_length = value;
}
}
}
public int LengthChar
{
get
{
return _length;
}
}

public NoteClass(int scale, int note, int length)
{
Scale = scale;
Note = note;
Length = length;
}
}

Una clase para controlar los pulsadores

public static class Utility
{
public static string PadLeft(string val, int maxlen, string padchar)
{
string newval = val;
while (newval.Length < maxlen)
{
newval = padchar + newval;
}
return newval;
}
public static string PadRight(string val, int maxlen, string padchar)
{
string newval = val;
while (newval.Length < maxlen)
{
newval += padchar;
}
return newval;
}
}

Y por último la clase principal:

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;

namespace DoorManager
{
public enum LightModes { Auto, ManualOn, ManualOff }

public class Program
{
#region User Settings & Constants
public static Cpu.Pin DoorSensorPin = Pins.GPIO_PIN_D11; //Magnetic switch to monitor door open/close state
public static Cpu.Pin LEDPin = Pins.GPIO_PIN_D13; //Status indicator (blinks if error or override on)
public static Cpu.Pin LightPin = Pins.GPIO_PIN_D12; //Connection to high voltage relay to control room light
public static Cpu.Pin Button1Pin = Pins.GPIO_PIN_D7; //Manually turns light on/off
public static Cpu.Pin Button2Pin = Pins.GPIO_PIN_D6; //Returns light control to automatic
public static Cpu.Pin Button3Pin = Pins.GPIO_PIN_D5; //Display error messages
public static Cpu.Pin Button4Pin = Pins.GPIO_PIN_D4; //Toggles door sensor (when off, no alerts are created)
public const int InitialDoorOpenAlertDelay = 30; //in minutes
public const int OngoingDoorOpenSoundAlertDelay = 1; //in minutes
public const int OngoingDoorOpenMessageAlertDelay = 30; //in minutes
public const int LCDOffDelay = 10; //in seconds
public const string AlertWebService = «http://192.168.1.2/WS/SendAlert.aspx?a=Door+Manager&e=Door+Opened»;
#endregion

#region Fields
public static string LastError = «»;
public static InterruptPort DoorSensor;
public static OutputPort LED;
public static OutputPort Light;
public static InterruptPort Button1;
public static InterruptPort Button2;
public static InterruptPort Button3;
public static InterruptPort Button4;
private static bool IsDoorSensorProcessing = false;
private static bool IsDoorSensorIgnored = false;
public static bool IsDoorOpen = false;
private static bool _LightState = false;
public static bool initializing = true;
public static bool IgnoreButtons = true;
public static bool IgnoreAlerts = false;
public static bool AlertScheduled = false;
public static Timer DoorTimer = new Timer(new TimerCallback(DoorTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static Timer LCDTimer = new Timer(new TimerCallback(LCDTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static Timer LEDTimer = new Timer(new TimerCallback(LEDTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static Timer ButtonTimer = new Timer(new TimerCallback(ButtonTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static Timer SendAlertTimer = new Timer(new TimerCallback(SendAlertTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static Timer DoorCloseTimer = new Timer(new TimerCallback(DoorCloseTimerHandler), null, Timeout.Infinite, Timeout.Infinite);
public static int CurrentMessageAlertDelayTimeout = 0;
public static int CurrentSoundAlertDelayTimeout = 0;
public static int CurrentAlertDelayTime = 0;
public static int CurrentLCDDelayTime = 0;
public static LightModes LightMode = LightModes.Auto;
private static int _LEDBlinkCount = 0;
public static bool _LEDBlink = false;

static NoteClass[] initTune = {
new NoteClass(5,NoteClass.C, NoteClass.Sixteenth),
new NoteClass(5,NoteClass.D, NoteClass.Sixteenth),
new NoteClass(5,NoteClass.E, NoteClass.Sixteenth),
new NoteClass(5,NoteClass.F, NoteClass.Sixteenth),
new NoteClass(5,NoteClass.G, NoteClass.Sixteenth),
new NoteClass(6,NoteClass.A, NoteClass.Sixteenth),
new NoteClass(6,NoteClass.B, NoteClass.Sixteenth),
new NoteClass(6,NoteClass.C, NoteClass.Sixteenth)
};
#endregion

#region Properties
public static bool LEDBlink
{
set
{
if (value)
_LEDBlinkCount++;
else
_LEDBlinkCount–;
if (_LEDBlinkCount > 0 && !_LEDBlink)
{
_LEDBlink = true;
LEDTimer.Change(250, Timeout.Infinite); //start timer
}
else if (_LEDBlinkCount == 0 && _LEDBlink)
{
LEDTimer.Change(Timeout.Infinite, Timeout.Infinite); //cancel timer
_LEDBlink = false;
LED.Write(false);
}
}
}
#endregion

#region Program Start
public static void Main()
{
Initialize();
ShowDoorSensorState();

Thread.Sleep(Timeout.Infinite); //keep running forever
}
#endregion

#region Methods
static void IgnoreButton()
{
IgnoreButtons = true;
ButtonTimer.Change(500, Timeout.Infinite); //restart timer
}

public static bool SetLightState()
{
bool expectedState = IsDoorOpen;
switch (LightMode)
{
case LightModes.ManualOn:
expectedState = true;
break;
case LightModes.ManualOff:
expectedState = false;
break;
}
if (expectedState != _LightState)
{
_LightState = expectedState;
Light.Write(expectedState);
}
return _LightState;
}

public static void SetIgnoreDoorSensor(bool ignore)
{
if (ignore != IsDoorSensorIgnored)
{
IsDoorSensorIgnored = ignore;
if (ignore)
{
LEDBlink = true;
//stop door sensor
DoorTimer.Change(Timeout.Infinite, Timeout.Infinite);
ParallaxLCD.LCD = true;
ParallaxLCD.Print(«Door Sensor\rDisabled»);
SetLCDOffTimer();
}
else
{
LEDBlink = false;
ParallaxLCD.LCD = true;
ParallaxLCD.Print(«Door Sensor\rEnabled»);
Thread.Sleep(2000);
//Check door
ShowDoorSensorState();
}
}
}

static void ShowDoorSensorState()
{
if (IsDoorSensorIgnored)
return;
ParallaxLCD.LCD = true; //ensure LCD is on
ParallaxLCD.Print(«Door » + (IsDoorOpen ? «Open» : «Closed»));
if (IsDoorOpen)
{
//start door timer
CurrentSoundAlertDelayTimeout = InitialDoorOpenAlertDelay * 60 * 1000; //convert minutes to milliseconds
CurrentAlertDelayTime = 0;
DoorTimer.Change(0, Timeout.Infinite);
}
else
{
//clear door timer
DoorTimer.Change(Timeout.Infinite, Timeout.Infinite);
//set LCD timer
SetLCDOffTimer();
}
SetLightState();
}

static void SetLCDOffTimer()
{
CurrentLCDDelayTime = LCDOffDelay * 1000;
LCDTimer.Change(1000, Timeout.Infinite);
}

static void Initialize()
{
ParallaxLCD.StartSerial();
ParallaxLCD.LCD = true;
ParallaxLCD.ClearLCD();
Thread.Sleep(1000);
ParallaxLCD.Print(«Initializing…»);
ParallaxLCD.Beep();
Thread.Sleep(1000);

//set LED
LED = new OutputPort(LEDPin, false);
LEDBlink = true;

//setup door sensor
DoorSensor = new InterruptPort(DoorSensorPin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth);
DoorSensor.OnInterrupt += new NativeEventHandler(DoorSensor_OnInterrupt);
IsDoorOpen = DoorSensor.Read();

//setup light control
Light = new OutputPort(LightPin, false);
Light.Write(_LightState);

//setup buttons
Button1 = new InterruptPort(Button1Pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
Button1.OnInterrupt += new NativeEventHandler(Button1_OnInterrupt);
Button2 = new InterruptPort(Button2Pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
Button2.OnInterrupt += new NativeEventHandler(Button2_OnInterrupt);
Button3 = new InterruptPort(Button3Pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
Button3.OnInterrupt += new NativeEventHandler(Button3_OnInterrupt);
Button4 = new InterruptPort(Button4Pin, true, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeLow);
Button4.OnInterrupt += new NativeEventHandler(Button4_OnInterrupt);

//setup network
Network.InitNetwork();

Thread.Sleep(5000);

ParallaxLCD.Print(«Ready»);
ParallaxLCD.Play(initTune);

Thread.Sleep(2000);

LEDBlink = false;

initializing = false;
IgnoreButtons = false;
}
#endregion

#region Timer Handlers
static void DoorCloseTimerHandler(object sender)
{
//this timer turns off sending alerts for a period of time after the door has been closed; this is another «bounce» preventative measure
DoorCloseTimer.Change(Timeout.Infinite, Timeout.Infinite); //cancel timer
IgnoreAlerts = false;
}

static void SendAlertTimerHandler(object sender)
{
//performing this in a timer ensures switch «bounce» doesn’t send multiple alerts
SendAlertTimer.Change(Timeout.Infinite, Timeout.Infinite); //cancel timer
Network.SendAlert();
AlertScheduled = false;
}

static void ButtonTimerHandler(object sender)
{
//this routine is to delay reaction to button presses to eliminate «bounce» and false presses
ButtonTimer.Change(Timeout.Infinite, Timeout.Infinite); //cancel timer
IgnoreButtons = false;
}

static void LEDTimerHandler(object sender)
{
if (_LEDBlink)
{
LED.Write(!LED.Read());
LEDTimer.Change(250, Timeout.Infinite); //restart timer
}
else
{
LED.Write(false);
}
}

static void LCDTimerHandler(object sender)
{
if (!IsDoorOpen || IsDoorSensorIgnored)
{
CurrentLCDDelayTime -= 1000;
if (CurrentLCDDelayTime <= 0)
{
CurrentLCDDelayTime = 0;
ParallaxLCD.LCD = false; //turn off LCD
//clear LCD timer
LCDTimer.Change(Timeout.Infinite, Timeout.Infinite);
}
else
{
LCDTimer.Change(1000, Timeout.Infinite);
}
}
else
{
//clear LCD timer
LCDTimer.Change(Timeout.Infinite, Timeout.Infinite);
}
}

static void DoorTimerHandler(object sender)
{
if (IsDoorOpen && !IsDoorSensorIgnored)
{
if (CurrentSoundAlertDelayTimeout > 0)
{
CurrentSoundAlertDelayTimeout -= CurrentAlertDelayTime;
}
if (CurrentMessageAlertDelayTimeout > 0)
{
CurrentMessageAlertDelayTimeout -= CurrentAlertDelayTime;
}
if (CurrentMessageAlertDelayTimeout <= 0)
{
//alert
SendAlertTimer.Change(5000, Timeout.Infinite); //send alert after 5 seconds
//restart delay
CurrentMessageAlertDelayTimeout = OngoingDoorOpenMessageAlertDelay * 60 * 1000; //convert minutes to milliseconds
}
if (CurrentSoundAlertDelayTimeout > 0)
{
int mins = CurrentSoundAlertDelayTimeout / 60000;
int secs = (CurrentSoundAlertDelayTimeout – (mins * 60000)) / 1000;
ParallaxLCD.Print(«Door Open\rAlert in » + (mins > 1 ? mins.ToString() + » min» : secs.ToString() + » sec»));
if (mins > 1)
{
CurrentAlertDelayTime = 60000;
}
else
{
CurrentAlertDelayTime = 1000;
}
}
else
{
//alert
ParallaxLCD.Play(new NoteClass(7, NoteClass.A, NoteClass.Half));
//restart delay
CurrentSoundAlertDelayTimeout = OngoingDoorOpenSoundAlertDelay * 60 * 1000; //convert minutes to milliseconds
CurrentAlertDelayTime = 0;
}
DoorTimer.Change(CurrentAlertDelayTime, Timeout.Infinite);
}
}
#endregion

#region Event Handlers
static void DoorSensor_OnInterrupt(uint data1, uint data2, DateTime time)
{
if (initializing || IsDoorSensorProcessing)
return;
IsDoorSensorProcessing = true;
//magnetic switch wired to normally open / onboard switch normally high
//therefore when the door is closed (magnetic switch open) the onboard switch (normally high) is on
IsDoorOpen = (data2 == 1);
if (IsDoorOpen && !IgnoreAlerts)
{
AlertScheduled = true;
SendAlertTimer.Change(5000, Timeout.Infinite); //send alert after 5 seconds
}
else if (!IsDoorOpen && !AlertScheduled)
{
IgnoreAlerts = true;
DoorCloseTimer.Change(5000, Timeout.Infinite); //prevent alerts for 5 seconds
}
ShowDoorSensorState();
IsDoorSensorProcessing = false;
}

/// <summary>
/// Button 1 turns the light on/off manually.
/// </summary>
static void Button1_OnInterrupt(uint data1, uint data2, DateTime time)
{
if (initializing)
return;
if (!IgnoreButtons)
{
IgnoreButtons = true;
ParallaxLCD.Acknowledge();
LightModes oldMode = LightMode;
if (_LightState)
LightMode = LightModes.ManualOff;
else
LightMode = LightModes.ManualOn;
SetLightState();
//if we’re moving off auto mode start the led blinking for awareness
if (oldMode == LightModes.Auto)
LEDBlink = true;
IgnoreButton();
}
}

/// <summary>
/// Button 2 sets the light back to automatic (door sensor controlled).
/// </summary>
static void Button2_OnInterrupt(uint data1, uint data2, DateTime time)
{
if (initializing)
return;
if (!IgnoreButtons)
{
IgnoreButtons = true;
if (LightMode != LightModes.Auto)
{
ParallaxLCD.Acknowledge();
LightMode = LightModes.Auto;
SetLightState();
LEDBlink = false;
}
IgnoreButton();
}
}

static void Button3_OnInterrupt(uint data1, uint data2, DateTime time)
{
if (initializing)
return;
if (!IgnoreButtons && (!IsDoorOpen || IsDoorSensorIgnored))
{
IgnoreButtons = true;
ParallaxLCD.Acknowledge();
if (LastError != null && LastError.Length > 0)
{
string msg = LastError;
//show error in byte size pieces
ParallaxLCD.LCD = true;
while (msg.Length > 0)
{
if (msg.Length > 32)
{
ParallaxLCD.Print(msg.Substring(0,32));
msg = msg.Substring(32);
}
else
{
ParallaxLCD.Print(msg);
msg = «»;
}
Thread.Sleep(5000);
}
ParallaxLCD.Acknowledge();
SetLCDOffTimer();
}
else
{
ParallaxLCD.LCD = true;
ParallaxLCD.Print(«No Errors»);
SetLCDOffTimer();
}
IgnoreButton();
}
}

/// <summary>
/// Button 4 disables/re-enables the door sensor.
/// </summary>
static void Button4_OnInterrupt(uint data1, uint data2, DateTime time)
{
if (initializing)
return;
if (!IgnoreButtons)
{
IgnoreButtons = true;
ParallaxLCD.Acknowledge();
SetIgnoreDoorSensor(!IsDoorSensorIgnored);
IgnoreButton();
}
}
#endregion
}
}

Lista de componentes :

• Netduino Plus 2 – $ 59.95  http://www.amazon.co…uct/B009QOYK2U/

• Interruptor magnético – $ 4.60  http://www.amazon.co…uct/B0009SUF08/

• Interruptor Amprobe RC-120S Remcon Relay – $ 39.33 http://www.amazon.co…uct/B0029XOKH0/

• Adaptador de corriente 9V – $ 6.45  http://www.amazon.co…uct/B003XZSZWO/

• Parallax 2×16 Serial LCD w / Speaker – $ 29.99   http://www.parallax….50/default.aspx

• 5VDC/1A SPDT Micro Relay – $ 4.69  http://www.radioshac…oductId=2062480

• 1N4004 1 Micro-Amp rectificador de diodos – $ 1.49  http://www.radioshac…oductId=2036270

• MPS2222A transistor – $ 1.49  http://www.radioshac…oductId=2062608

• 3 resistencias de 1K ohmios – $ 1.49  http://www.radioshac…oductId=2062323

• 2 LED, 4 interruptores momentáneos, tornillos diverso, caja de proyecto

• Opcional: Kit Protoshield para Ardiono – $ 9.90  http://www.seeedstud…uino-p-318.html
• Este kit incluye una placa de circuito de prototipos, conectores, resistencias, los LED (no caja montable en proyecto), conmutadores (no caja montable proyecto) y otras piezas misceláneas que puede ayudar a un iniciado a empezar.

Fuente  aqui