项目描述

此项目通过使用Ethernet Shield及Twitter推送来控制一个情景灯。

步骤1：材料

这个项目用到了很少的材料，有很多是不必要的。你也可以改变灯的外形，这样可能会用到更少材料。

电子零件

Arduino Uno R3（我买了一个SainSmart版本，以削减成本） Arduino Ethernet Shield（我在Radio Shack只花了10美金就搞定了） 4个Led 网线 电源适配器 焊锡

装饰材料

亚克力盒子（我在沃尔玛仓储区找到了一个预制的） 少量约1/2英尺厚的木头 橡胶垫脚 木染料 磨砂玻璃喷漆 泡沫塑料（用来放Arduino） 单乙烯基（做一个可在亚克力上喷漆的模具） 钉子 木胶

需要工具

烙铁 电钻 射钉枪 热胶枪 模切绘图机（用于磨具，不必须有）

步骤2：电子器件构建

受电子知识的限制，我尽量将一切简化。我把led灯直接焊接在了Ethernet Shield上。使用了12和13端口。而前后讲Ethernet Shield插入到Arduino对应引脚上。

步骤3：木头盒子

我构建了一个木头盒子，这样亚克力盒子就能放在里面了。并在一面打了一个洞，如此ethernet 线材及供电线材可以透过来。

步骤4：亚克力盒子

我很幸运找到了一个够透的亚克力盒子，你可以尽可能的简化你的构建。我在与木头盒子相对应的位置钻了一个洞，这样线材就可以轻松的插到灯上。

钻完洞，我用磨砂玻璃喷漆给他罩了一层外衣。一旦射出来盒子里的图形光可见。图像就会清晰的看到。

步骤5：泡沫塑料盒子

我用了一个小薄片的泡沫，并把亚克力盒子的开口按进了泡沫。而后在泡沫中留下一个印记，随后就开始切割。根据泡沫上的印记，讲Arduino放到里面，就构建出镶嵌物的位置了。

步骤6：Arduino代码

以下代码是用于Nike Restock 闹钟的代码。你需要更改代码中的ip地址及mac地址。

<p>/*<br>  Twitter Client with Strings

 This sketch connects to Twitter using an Ethernet shield. It parses the XML
 returned, and looks for this is a tweet

 You can use the Arduino Ethernet shield, or the Adafruit Ethernet shield, 
 either one will work, as long as it's got a Wiznet Ethernet module on board.

 This example uses the DHCP routines in the Ethernet library which is part of the 
 Arduino core from version 1.0 beta 1

 This example uses the String library, which is part of the Arduino core from
 version 0019.  

 Circuit:
  * Ethernet shield attached to pins 10, 11, 12, 13

 created 21 May 2011
 by Tom Igoe
 modified by Amanda Ghassaei June 2012

http://www.instructables.com/id/Twitter-Controlled-Pet-Feeder/

 modified again by cdw181818 December 2014

 This code is in the public domain.

 */
#include 
#include </p><p>//variable to prevent overfeeding
boolean nikeRestock = 1;</p><p>// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
IPAddress ip(xxx,xxx,xxx,xx; //<<< ENTER YOUR IP ADDRESS HERE</p><p>// initialize the library instance:
EthernetClient client;</p><p>const int requestInterval = 60000;  // delay between requests = 1min</p><p>char serverName[] = "api.twitter.com";  // twitter URL</p><p>boolean requested;                   // whether you've made a request since connecting
long lastAttemptTime = 0;            // last time you connected to the server, in milliseconds</p><p>String currentLine = "";            // string to hold the text from server
String tweet = "";                  // string to hold the tweet
boolean readingTweet = false;       // if you're currently reading the tweet</p><p>void setup() {

  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);

  // reserve space for the strings:
  currentLine.reserve(256);
  tweet.reserve(150);</p><p>// initialize serial:
  Serial.begin(9600);
  // attempt a DHCP connection:
  if (!Ethernet.begin(mac)) {
    // if DHCP fails, start with a hard-coded address:
    Ethernet.begin(mac, ip);
  }
  // connect to Twitter:
  connectToServer();

  testing();
}</p><p>void loop()
{
  if (nikeRestock){
    if (client.connected()) {
      if (client.available()) {
        // read incoming bytes:
        char inChar = client.read();</p><p>        // add incoming byte to end of line:
        currentLine += inChar; 

        // if you get a newline, clear the line:
        if (inChar == '\n') {
          currentLine = "";
        } 
        // if the current line ends with , it will
        // be followed by the tweet:
        if ( currentLine.endsWith("")) {
          // tweet is beginning. Clear the tweet string:
          readingTweet = true; 
          tweet = "";
        }
        // if you're currently reading the bytes of a tweet,
        // add them to the tweet String:
        if (readingTweet) {
          if (inChar != '<') {
            tweet += inChar;
          } 
          else {
            // if you got a "<" character,
            // you've reached the end of the tweet:
            readingTweet = false;
            Serial.println(tweet);

            if(tweet == ">restock"){
             digitalWrite(12, HIGH);
             digitalWrite(13, HIGH);
             Serial.println("LED ON!");
             delay(360000);//turn on for 1 hour
             digitalWrite(12, LOW);
             digitalWrite(13, LOW);
             nikeRestock = 0;
            }
            if(tweet != ">restock"){
             digitalWrite(12, LOW);
             digitalWrite(13, LOW);
             Serial.println("LED OFF!");
            }

            // close the connection to the server:
            client.stop(); 
          }
        }
      }   
    }
    else if (millis() - lastAttemptTime > requestInterval) {
      // if you're not connected, and two minutes have passed since
      // your last connection, then attempt to connect again:
      connectToServer();
    }
  }
  else if (millis() - lastAttemptTime > 14400000){//if four hours has passed since last feeding
    nikeRestock = 1;
  }
}</p><p>void testing(){
  digitalWrite(12, HIGH);
  digitalWrite(13, HIGH);
  delay(1000);
  digitalWrite(12, LOW);
  digitalWrite(13, LOW);

}</p><p>void connectToServer() {
  // attempt to connect, and wait a millisecond:
  Serial.println("connecting to server...");
  if (client.connect(serverName, 80)) {
    Serial.println("making HTTP request...");
  // make HTTP GET request to twitter:
    client.println("GET /1/statuses/user_timeline.xml?screen_name=nikestore&count=1 HTTP/1.1");
    client.println("HOST: api.twitter.com");
    client.println();
  }
  // note the time of this connect attempt:
  lastAttemptTime = millis();
}</p>

步骤7：完成

在给Arduino上传程序之后，我把他放到了泡沫垫中，并插上线材。这样就安装好了一个木头盒子。而后在每个角上点一点热熔胶，并盖上亚克力盒子。

剩下的就是在出口那插入电源适配器，并将网线插到路由上。灯会立即点亮，这样就可以开始设置了。接下来就可以等待restock的信息推送了！