【如何設計網路計時器？】物聯網開發篇

物聯網之投幣計時器程式設計

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 投幣計時器程式一，我們就可以 Arduino 開發板加上乙太網路擴充版(W5100)的網路功能，透過網際網路，將使用者投幣使用投幣計時器的資訊，送到 ThingSpeak 雲端平台-我們建立的『NetTimer』頻道內。

表1 物聯網之Arduino投幣計時器

物聯網之Arduino投幣計時器(Coin_Test51)

#include <DS1307RTC.h>

#include <Time.h>

#include <Ethernet.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#define CoinMinute 5

#define RelayPin 12

#define turnon HIGH

#define turnoff LOW

boolean PowerStatus = false ;

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

// 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;

// 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);

// attachInterrupt(RFIDIntrupNumber, ReadRfidID, 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);

}

// give the Ethernet shield a second to initialize:

delay(1000);

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

}

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, 1);

// 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 ;

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

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

}

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);

        }

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

        {

          CoinTime = 0 ;

          UseSecond = 0 ;

          TotalCoin = 0 ;

          PowerStatus = false ;

            digitalWrite(RelayPin,turnoff);

        }

}

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);

}

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