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Diffstat (limited to 'libraries/Ethernet/examples/TwitterClient')
-rw-r--r-- | libraries/Ethernet/examples/TwitterClient/TwitterClient.ino | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libraries/Ethernet/examples/TwitterClient/TwitterClient.ino b/libraries/Ethernet/examples/TwitterClient/TwitterClient.ino new file mode 100644 index 0000000..3587d72 --- /dev/null +++ b/libraries/Ethernet/examples/TwitterClient/TwitterClient.ino @@ -0,0 +1,135 @@ +/* + 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 + modified 9 Apr 2012 + 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); + + // Open serial communications and wait for port to open: + Serial.begin(9600); + while (!Serial) { + ; // wait for serial port to connect. Needed for Leonardo only + } + + + // 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(); +} + |