mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-04 15:24:12 +01:00
136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/*
|
|
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();
|
|
}
|
|
|