【如何設計網路計時器？】物聯網開發篇

顯示網路連接資訊

如果網路出現問題，或網路未準備好，我們無法了解是否可以更新網路資訊到物聯網，所以我們打開 Arduino 開發板的開發工具，編寫一段程式，如下表所示之物聯網之 Arduino 投幣計時器二，我們將網路連接資訊顯示再 LCD 顯示模組上。

表2 物聯網之 Arduino 投幣計時器二

物聯網之 Arduino 投幣計時器二(Coin_Test52)

// Local Network Settings

byte mac[] = {

  0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF

};

IPAddress ip(192, 168, 2, 200);     //fix ip

IPAddress dnServer(168, 95, 1, 1);    //dns server ip

// the router's gateway address:

IPAddress gateway(192, 168, 2, 1);      //inet gateway ip

// the subnet:

IPAddress subnet(255, 255, 255, 0);

// ThingSpeak Settings

byte server[]  = { 184, 106, 153, 149 }; // IP Address for the ThingSpeak API

const int updateInterval = 2000;        // Time interval in milliseconds to update ThingSpeak

EthernetClient client ;

// Variable Setup

long lastConnectionTime = 0;

boolean lastConnected = false;

int resetCounter = 0;

boolean InternetOK = false ;

// Initialize Arduino Ethernet Client

// ThingSpeak Settings

String writeAPIKey = "F86O9SXIVV6N3VGW ";    // Write API Key for a ThingSpeak Channel

//=================

//  ===========  use time variable

int UseSecond = 0 ;

int UseMinute = 0 ;

LiquidCrystal_I2C lcd(0x27, 20, 4); // set the LCD address to 0x27 for a 16 chars and 2 line display

int coinnum = 0 ;

tmElements_t tm;

int TotalCoin = 0 ;

int CoinTime = 0 ;

void setup()

{

  Serial.begin(9600);

  lcd.init();                      // initialize the lcd

  // Print a message to the LCD.

  lcd.backlight();

  pinMode(RelayPin, OUTPUT);

  digitalWrite(RelayPin, turnoff) ;

  attachInterrupt(1, addcoin, RISING);

  //attachInterrupt(1, addcoin, CHANGE);

  // start the Ethernet connection:

  if (Ethernet.begin(mac) == 0) {

    Serial.println("Failed to configure Ethernet using DHCP");

    // no point in carrying on, so do nothing forevermore:

    // try to congifure using IP address instead of DHCP:

        Ethernet.begin(mac, ip, dnServer, gateway, subnet);

        InternetOK = false ;

  }

  else

  {

     InternetOK = true ;

     // give the Ethernet shield a second to initialize:

        Serial.println("connecting...");

  }

     ShowNetworkStatus(InternetOK) ;

  delay(1000);

}

void loop()

{

  // 將游標設到 　第一行, 　第二列

  // (注意: 　第二列第五行，因為是從 0 開始數起):

 // lcd.setCursor(5, 2);

  // 列印 Arduino 重開之後經過的秒數

 // lcd.print(millis() / 1000);

  getDateTime() ;

  LCDDateTime() ;

  LCDCoin(TotalCoin, CoinTime) ;

  CheckStatus() ;

  if (PowerStatus)

  {

    //        UseSecond = UseSecond + 15 ;

    UseSecond ++ ;

    CheckUseTIme() ;

  }

  delay(1000);

}

void addcoin()

{

  TotalCoin ++ ;

  CoinTime = CoinTime + CoinMinute ;

 // LCDShowStatus("New Coins") ;

 // delay(1000);

  if (InternetOK)

  {

        updateThingSpeak("field1=" + StrDate() + "&field2=" + StrTime() + "&field3=" + "1" + "&field4=" + CoinMinute);

        Serial.println("Update thingspeak is ok");

    //    LCDShowStatus("Update Data to IOT") ;

  }

}

String  print2digits(int number) {

  String ttt ;

  if (number >= 0 && number < 10)

  {

    ttt = String("0") + String(number);

  }

  else

  {

    ttt = String(number);

  }

  return ttt ;

}

String  print4digits(int number) {

  String ttt ;

  ttt = String(number);

  return ttt ;

}

String  StrDate() {

  String ttt ;

  ttt = print4digits(tmYearToCalendar(tm.Year)) + "/" + print2digits(tm.Month) + "/" + print2digits(tm.Day) ;

  return ttt ;

}

String  StrTime() {

  String ttt ;

  ttt = print2digits(tm.Hour) + ":" + print2digits(tm.Minute) + ":" + print2digits(tm.Second) ;

  return ttt ;

}

boolean  getDateTime()

{ if (RTC.read(tm))

    return true ;

  else

    return false ;

}

void LCDDateTime()

{

  lcd.setCursor(0, 0);

  lcd.print(StrDate());

  lcd.setCursor(11, 0);

  lcd.print(StrTime());

}

void LCDCoin(int c1, int c2)

{

  lcd.setCursor(1, 3);

  lcd.print("Credit:");

  lcd.print(c1);

  lcd.print(" / ") ;

  lcd.print(c2);

  lcd.print(" min");

  Serial.println(coinnum);

}

void CheckStatus()

{

  if (!PowerStatus  && ( CoinTime > 0 ) )

  {

    // UseSecond ++ ;

    PowerStatus = true ;

    digitalWrite(RelayPin, turnon);

    Serial.println("Now Turn On Power") ;

  }

  if (PowerStatus  && ( CoinTime <= 0 ) )

  {

    CoinTime = 0 ;

    UseSecond = 0 ;

    TotalCoin = 0 ;

    PowerStatus = false ;

    digitalWrite(RelayPin, turnoff);

    Serial.println("Now Turn off Power") ;

  }

}

void CheckUseTIme()

{

  if (UseSecond >= 60)

  {

    CoinTime --;

    UseSecond = 0 ;

  }

}

//===============

void updateThingSpeak(String tsData)

{

  if (client.connect(server, 80))

  {

    Serial.println("Connected to ThingSpeak...");

    Serial.print("Data is :(");

    Serial.print(tsData);

    Serial.print(")\n");

    Serial.println();

    client.print("POST /update HTTP/1.1\n");

    client.print("Host: api.thingspeak.com\n");

    client.print("Connection: close\n");

    client.print("X-THINGSPEAKAPIKEY: " + writeAPIKey + "\n");

    client.print("Content-Type: application/x-www-form-urlencoded\n");

    client.print("Content-Length: ");

    client.print(tsData.length());

    client.print("\n\n");

    client.print(tsData);

    lastConnectionTime = millis();

    resetCounter = 0;

  }

  else

  {

    Serial.println("Connection Failed.");

    Serial.println();

    resetCounter++;

    if (resetCounter >= 5 ) {

      resetEthernetShield();

    }

    lastConnectionTime = millis();

  }

}

void resetEthernetShield()

{

  Serial.println("Resetting Ethernet Shield.");

  Serial.println();

  client.stop();

  delay(1000);

  Ethernet.begin(mac, ip, gateway, subnet);

  delay(1000);

}

//===============

void ShowNetworkStatus(boolean st)

{

  lcd.setCursor(1, 1);

  lcd.print("Net:");

  if (st)

  {

    lcd.print("Connected");

  }

  else

  {

    lcd.print("Disconnected");

  }

}

void LCDShowStatus(String msg)

{

  lcd.setCursor(1,2);

  lcd.print("               ");

  lcd.setCursor(1,2);

  lcd.print(msg);

}

如下圖所示，當上面程式寫好後，編譯完成後，如下圖所示，可以看到顯示網路連接資訊。

▲圖9 顯示網路連接資訊

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