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Diffstat (limited to 'libraries/WiFi/examples/WifiTwitterClient/WifiTwitterClient.ino')
-rw-r--r-- | libraries/WiFi/examples/WifiTwitterClient/WifiTwitterClient.ino | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/libraries/WiFi/examples/WifiTwitterClient/WifiTwitterClient.ino b/libraries/WiFi/examples/WifiTwitterClient/WifiTwitterClient.ino new file mode 100644 index 0000000..3dc2c8d --- /dev/null +++ b/libraries/WiFi/examples/WifiTwitterClient/WifiTwitterClient.ino @@ -0,0 +1,163 @@ +/* + Wifi Twitter Client with Strings + + This sketch connects to Twitter using using an Arduino WiFi shield. + It parses the XML returned, and looks for <text>this is a tweet</text> + + This example is written for a network using WPA encryption. For + WEP or WPA, change the Wifi.begin() call accordingly. + + This example uses the String library, which is part of the Arduino core from + version 0019. + + Circuit: + * WiFi shield attached to pins 10, 11, 12, 13 + + created 23 apr 2012 + modified 31 May 2012 + by Tom Igoe + + This code is in the public domain. + + */ +#include <SPI.h> +#include <WiFi.h> + +char ssid[] = "yourNetwork"; // your network SSID (name) +char pass[] = "password"; // your network password (use for WPA, or use as key for WEP) +int keyIndex = 0; // your network key Index number (needed only for WEP) + +int status = WL_IDLE_STATUS; // status of the wifi connection + +// initialize the library instance: +WiFiClient client; + +const unsigned long requestInterval = 30*1000; // delay between requests; 30 seconds + +// if you don't want to use DNS (and reduce your sketch size) +// use the numeric IP instead of the name for the server: +//IPAddress server(199,59,149,200); // numeric IP for api.twitter.com +char server[] = "api.twitter.com"; // name address for twitter API + +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 and wait for port to open: + Serial.begin(9600); + while (!Serial) { + ; // wait for serial port to connect. Needed for Leonardo only + } + + // check for the presence of the shield: + if (WiFi.status() == WL_NO_SHIELD) { + Serial.println("WiFi shield not present"); + // don't continue: + while(true); + } + + // attempt to connect to Wifi network: + while ( status != WL_CONNECTED) { + Serial.print("Attempting to connect to SSID: "); + Serial.println(ssid); + // Connect to WPA/WPA2 network. Change this line if using open or WEP network: + status = WiFi.begin(ssid, pass); + + // wait 10 seconds for connection: + delay(10000); + } + // you're connected now, so print out the status: + printWifiStatus(); + 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 = ""; + // break out of the loop so this character isn't added to the tweet: + return; + } + // 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(server, 80)) { + Serial.println("making HTTP request..."); + // make HTTP GET request to twitter: + client.println("GET /1/statuses/user_timeline.xml?screen_name=arduino HTTP/1.1"); + client.println("Host:api.twitter.com"); + client.println("Connection:close"); + client.println(); + } + // note the time of this connect attempt: + lastAttemptTime = millis(); +} + + +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"); +} + + + + |