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+/*
+ Twitter Client with Strings
+
+ This sketch connects to Twitter using an Ethernet shield. It parses the XML
+ returned, and looks for <text>this is a tweet</text>
+
+ 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
+
+ This code is in the public domain.
+
+ */
+#include <SPI.h>
+#include <Ethernet.h>
+
+
+// Enter a MAC address and IP address for your controller below.
+// The IP address will be dependent on your local network:
+byte mac[] = {
+ 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x01 };
+IPAddress ip(192,168,1,20);
+
+// initialize the library instance:
+EthernetClient client;
+
+const unsigned long requestInterval = 60000; // delay between requests
+
+char serverName[] = "api.twitter.com"; // twitter URL
+
+boolean requested; // whether you've made a request since connecting
+unsigned long lastAttemptTime = 0; // last time you connected to the server, in milliseconds
+
+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
+
+void setup() {
+ // reserve space for the strings:
+ currentLine.reserve(256);
+ tweet.reserve(150);
+
+ // initialize serial:
+ Serial.begin(9600);
+ // attempt a DHCP connection:
+ Serial.println("Attempting to get an IP address using DHCP:");
+ if (!Ethernet.begin(mac)) {
+ // if DHCP fails, start with a hard-coded address:
+ Serial.println("failed to get an IP address using DHCP, trying manually");
+ Ethernet.begin(mac, ip);
+ }
+ Serial.print("My address:");
+ Serial.println(Ethernet.localIP());
+ // connect to Twitter:
+ connectToServer();
+}
+
+
+
+void loop()
+{
+ if (client.connected()) {
+ if (client.available()) {
+ // read incoming bytes:
+ char inChar = client.read();
+
+ // 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 <text>, it will
+ // be followed by the tweet:
+ if ( currentLine.endsWith("<text>")) {
+ // 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);
+ // 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();
+ }
+}
+
+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=arduino&count=1 HTTP/1.1");
+ client.println("HOST: api.twitter.com");
+ client.println();
+ }
+ // note the time of this connect attempt:
+ lastAttemptTime = millis();
+}
+