AMEBA透過建構網頁伺服器控制電器開關

Posted on 5 月 9, 2016 in Realtek Ameba, 單元, 教學文, 解決方案, 開發平台

作者：曹永忠

智慧家庭的另一個核心技術是電源，如何控制電力供應則是智慧家庭的核心技術與關鍵資源，所以讓Ameba連網控制家庭電力供應，變成物聯網重要的基礎能力，如果能用物聯網神器Ameba開發板建構一個網頁伺服器，讓使用者在使用電腦、行動裝置…等等時，透過簡單好用的瀏覽器，輕易控制電力開關，那該有多好？本文將教您使用Ameba建構電力控制的網頁，只要用滑鼠輕輕一點，就可以控制電力開關。

組立繼電器的步驟

第一步：我們將取出圖(a)的繼電器模組，將DC+端(+5V/VCC)使用雙公杜邦線插入後，另一端插於麵包板兩端紅線那邊的插孔；再將DC-端(GND)使用雙公杜邦線插入，另一端則插於麵包板兩端藍線那邊的插孔，如圖(c)，便可完成繼電器模組的電力供應。

第二步：我們將取出如圖(a)的繼電器模組，將IN端使用雙公杜邦線插入後，另一端插於Ameba開發板的D8腳位(Digital Input Pin 8)，如圖(b)，便也完成繼電器模組的控制電路。

繼電器電路安裝圖如下：

(a)繼電器輸入端

(b)繼電器輸入接D8

(c)繼電器輸入接法

透過網頁控制繼電器模組

所以接下來，要教讀者如何透過Ameba，使用WIFI模組與TCP/IP方式，建立網頁伺服器，並透過網頁方式來控制繼電器模組開與關。
將Ameba開發板的驅動程式安裝好之後，打開Ameba開發工具「Sketch IDE整合開發軟體」，撰寫一些程式，經由網頁控制繼電器模組測試程式，就可以透過Ameba Wi-fi模組建立網頁，控制繼電器模組開與關，透過網頁控制繼電器模組測試程式如下：


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透過網頁控制繼電器模組測試程式　(WebServerControlRelay)

#include 

char ssid[] = "linkitone";      //  your network SSID (name)

char pass[] = "";   // your network password

int keyIndex = 0;                 // your network key Index number (needed only for WEP)



int status = WL_IDLE_STATUS;

WiFiServer server(80);



#define RelayPin 8

#define Turnon HIGH

#define Turnoff LOW



void setup() {

  Serial.begin(9600);      // initialize serial communication

  pinMode(RelayPin, OUTPUT);      // set the LED pin mode

  // check for the presence of the shield:

  if (WiFi.status() == WL_NO_SHIELD) {

    Serial.println("WiFi shield not present");

    while (true);       // don't continue

  }

  

  String fv = WiFi.firmwareVersion();

  if (fv != "1.1.0") {

    Serial.println("Please upgrade the firmware");

  }



  // attempt to connect to Wifi network:

  while (status != WL_CONNECTED) {

    Serial.print("Attempting to connect to Network named: ");

    Serial.println(ssid);                   // print the network name (SSID);



    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:

    status = WiFi.begin(ssid);    //no pass

//    status = WiFi.begin(ssid, pass);    //wpa use

    // wait 10 seconds for connection:

    delay(10000);

  }

  server.begin();                           // start the web server on port 80

  printWifiStatus();                        // you're connected now, so print out the status

}





void loop() {

  WiFiClient client = server.available();   // listen for incoming clients



  if (client) {                             // if you get a client,

    Serial.println("new client");           // print a message out the serial port

    String currentLine = "";                // make a String to hold incoming data from the client

    while (client.connected()) {            // loop while the client's connected

      if (client.available()) {             // if there's bytes to read from the client,

        char c = client.read();             // read a byte, then

        Serial.write(c);                    // print it out the serial monitor

        if (c == '\n') {                    // if the byte is a newline character



          // if the current line is blank, you got two newline characters in a row.

          // that's the end of the client HTTP request, so send a response:

          if (currentLine.length() == 0) {

            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)

            // and a content-type so the client knows what's coming, then a blank line:

            client.println("HTTP/1.1 200 OK");

            client.println("Content-type:text/html");

            client.println();



            // the content of the HTTP response follows the header:

            client.print("Click <a href="\&quot;/H\&quot;">here</a> turn Power on

");

            client.print("Click <a href="\&quot;/L\&quot;">here</a> turn Power off

");



            // The HTTP response ends with another blank line:

            client.println();

            // break out of the while loop:

            break;

          } else {    // if you got a newline, then clear currentLine:

            currentLine = "";

          }

        } else if (c != '\r') {  // if you got anything else but a carriage return character,

          currentLine += c;      // add it to the end of the currentLine

        }



        // Check to see if the client request was "GET /H" or "GET /L":

        if (currentLine.endsWith("GET /H")) {

          digitalWrite(RelayPin, Turnon);               // GET /H turns the LED on

        }

        if (currentLine.endsWith("GET /L")) {

          digitalWrite(RelayPin, Turnoff);                // GET /L turns the LED off

        }

      }

    }

    // close the connection:

    client.stop();

    Serial.println("client disonnected");

  }

}



void printWifiStatus() {

  // print the SSID of the network you're attached to:

  Serial.print("SSID: ");

  Serial.println(WiFi.SSID());



  // print your WiFi shield's IP address:

  IPAddress ip = WiFi.localIP();

  Serial.print("IP Address: ");

  Serial.println(ip);



  // print the received signal strength:

  long rssi = WiFi.RSSI();

  Serial.print("signal strength (RSSI):");

  Serial.print(rssi);

  Serial.println(" dBm");

  // print where to go in a browser:

  Serial.print("To see this page in action, open a browser to http://");

  Serial.println(ip);

}