org.sintef.jarduino.examples.advanced.Twitter4Arduino.java Source code

Introduction

Here is the source code for org.sintef.jarduino.examples.advanced.Twitter4Arduino.java

Source

/**
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3, 29 June 2007;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.gnu.org/licenses/lgpl-3.0.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Authors: Jan Ole Skotterud, Franck Fleurey and Brice Morin
 * Company: SINTEF IKT, Oslo, Norway
 * Date: 2011
 */
package org.sintef.jarduino.examples.advanced;

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import org.sintef.jarduino.DigitalPin;
import org.sintef.jarduino.DigitalState;
import org.sintef.jarduino.JArduino;
import org.sintef.jarduino.PinMode;

import twitter4j.Status;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;

/*
 * This is a demonstration on how little code you need to connect your 
 * Arduino to Twitter and get one LED to light up when you receive 
 * a new tweet from someone you are following.
 * 
 * This example does not show how to register your application
 * with twitter, to do this follow the nice tutorial on 
 * http://twitter4j.org/en/code-examples.html
 */
public class Twitter4Arduino extends JArduino {

    private DigitalPin led = DigitalPin.PIN_13;
    private Twitter twitter;
    private Status last;
    private Timer timer;
    private String userName;

    public Twitter4Arduino(String port, String customerKey, String customerSecret, String accessKey,
            String accessSecret, String userName) {
        super(port);
        this.userName = userName;
        this.twitter = new TwitterFactory().getInstance();
        this.twitter.setOAuthConsumer(customerKey, customerSecret);
        AccessToken accessToken = new AccessToken(accessKey, accessSecret);
        this.twitter.setOAuthAccessToken(accessToken);

        this.timer = new Timer();
    }

    /*
     * Turns off the LED
     */
    public void turnOffLED() {
        digitalWrite(led, DigitalState.LOW);
    }

    @Override
    public void setup() {
        //connect pin 13 to LED
        pinMode(led, PinMode.OUTPUT);
        turnOffLED(); //turn it of in case it is on after running another application
    }

    @Override
    protected void loop() {
        List<Status> statuses;
        try {
            //Get status updates from your tweet feed
            statuses = twitter.getFriendsTimeline();
            //select the last tweet
            Status status = (Status) statuses.get(0);
            //check if it is a new tweet, or if you have it from before
            if (last == null || !status.getUser().getName().equals(last.getUser().getName())
                    && !status.getText().equals(last.getText())) {
                //check that the tweet isn't written by yourself
                if (!status.getUser().getScreenName().equalsIgnoreCase(userName)) {
                    System.out.println(status.getUser().getScreenName() + ":" + status.getText());
                    last = status;
                    //light up the Arduino
                    digitalWrite(led, DigitalState.HIGH);
                    timer.schedule(new Timeout(this), 10000);
                }
            }
            //wait ten seconds before checking again
            //Twitter have a limit on how many times you can check per day
            delay(10000);
        } catch (TwitterException e) {
            e.printStackTrace();
        }
    }

    /**
     * Here you can set all your variables before launching 
     * your application
     */
    public static void main(String[] args) {
        String customerKey = "your consumer key";
        String customerSecret = "your consumer secret";
        String accessKey = "your access key";
        String accessSecret = "your access secret";
        String twitterUserName = "your user name";

        JArduino arduino = new Twitter4Arduino("COM6", customerKey, customerSecret, accessKey, accessSecret,
                twitterUserName);
        arduino.runArduinoProcess();
    }

    private class Timeout extends TimerTask {

        Twitter4Arduino t4a;

        public Timeout(Twitter4Arduino t4a) {
            this.t4a = t4a;
        }

        @Override
        public void run() {
            t4a.turnOffLED();
        }
    }
}