Published September 3, 2014 © MIT

"like-anator"

likes on a Facebook page result in buzzer beeps connected to Spark core in your home .

Full instructions provided915

Story

This project is my 1st foray into the world of spark core. I wanted to get some hands on experience with spark core, sensors and electronics in Spark maker kit, its cloud IDE & the "cloud OS" . I also wanted introduce my 8 yr old kid to the exciting world of electronics and programming. She named it "like-anator" spontaneously as she is a "Phineas and Ferb" fan.

This project has 3 main parts

1) the bread-board & electronics ( all the components seen in the pic came in the spark maker kit that I bought here www.spark.io)

I connected the +ve end of buzzer directly to pin D5 on the core, -ve to the GND on the core. The core is powered by USB hub .

2) a program that monitors Facebook "likes"

I wrote this program in Java and runs in a forever loop on my macbook. The only job of this program is to monitor facebook likes on a particular page and if they increment, invoke a function "buzz" on spark core using spark's REST API.

replace XXXXX in the code with the Facebook page you want to monitor. your spark device ID and spark token also need to be added to make the REST call to your spark.

alert: this program is a hack with a lot of things which are less that perfect. The likes are parsed assuming a specific position of the likes number in the text response from Facebook. you may have to fine tune this pgm for your case.

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package com.mypkg.spark;
import java.net.*;
import java.io.*;
import java.util.*;
import org.apache.http.entity.*;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

public class FacebookGraph {

	private  static String HOST="http://graph.facebook.com/" ;// all Facebook pages start with this domain
	private static String MYPAGE = "XXXXXXXXX"; // check likes on this page
	/**
	 * @param args
	 */
	public static void main(String[] args) {
	try {
		//SendToSpark();
		// TODO Auto-generated method stub
		int likesOld = getLikes(HOST,MYPAGE);
		int likesNew;
		while ( true)
		{
			Thread.sleep(3000);
			likesNew = getLikes(HOST,MYPAGE);
			if ( likesNew > likesOld)
			{// POST call to SPARK core.
				SendToSpark();
			}
			likesOld=likesNew;
			System.out.println("facebook likes="+likesNew);
		}
		} catch ( Exception exp)
		{
			System.out.println(exp.toString());
	}
	};
	private static void SendToSpark()
	{
		try {
			HttpClient client = new DefaultHttpClient();
			HttpPost post = new HttpPost("https://api.spark.io/v1/devices/0123456789abcdef01234567_YOURDEVICE/buzz?access_token=9876987698769876987698769876987698769876_YOUR_TOKEN");
			
			HttpResponse response = client.execute(post);
			BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        	String line = "";
        	while ((line = rd.readLine()) != null) {
        		System.out.println(line);
        	}
		}
        catch (Exception exx){
        	System.out.println(exx.toString());
        }
    }
	
	
	private static int getLikes (String HOST, String MYPAGE)
	{
		int likesNum=0;
		try
		{
		URL link = new URL(HOST + MYPAGE);
        Socket s = new Socket(link.getHost(), 80);
        OutputStream theOutput = s.getOutputStream();
        // no auto-flushing
        PrintWriter pw = new PrintWriter(theOutput, false);
        // native line endings are uncertain so add them manually
        pw.print("GET " + link.getFile() + " HTTP/1.1\r\n");
        pw.print("HOST: " + "graph.facebook.com\r\n");
        pw.print("Connection: close\r\n");
        pw.print("Accept: text/plain, text/html, text/*\r\n");
        pw.print("\r\n");
        pw.flush();
        InputStream in = s.getInputStream();
        InputStreamReader isr = new InputStreamReader(in);
        BufferedReader br = new BufferedReader(isr);
//        int c;
        String response;
        while (( response = br.readLine()) != null)
        {
//        	while ((c = br.read()) != -1) {
//          	System.out.print((char) c);
//          	response = response.concat((String)c);
          
//        	} 
        	System.out.println(response);
        	int indx=response.indexOf("likes\":");
        	if (indx > -1)
        	{
        		int nextIndx = response.indexOf("\"link\":");
        		String likesString= response.substring(indx+7, nextIndx-1);
        		likesNum = Integer.valueOf(likesString).intValue();
        		break;
        	}
        }
        s.close();
		} catch (Exception ioe)
		{
			System.out.println(ioe.toString());
		}		
		return likesNum ; 
	}

}

3) firmware on spark to generate beeps when a method/function is invoked.

If you are totally new to spark, I would recommend playing with some spark examples first from their website, to get hang of REST API, the cloud IDE etc. goto http://docs.spark.io/examples/

I could have written the spark firmware so that it would run the entire logic of checking Facebook likes also, however I chose to write the "Java Server" as in step 2 seperatly coz if this was a real commercial project, i would have done it this way to keep firmware as simple as possible and load the micro controller as less as possible.

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// Define the pins we're going to call pinMode on
int led = D1; // This one is the built-in tiny one to the right of the USB jack
int blinkLed (String number) ;
int buzzer = D5;

// This routine runs only once upon reset
void setup() {
  // Initialize D0 + D5 pin as output
  // It's important you do this here, inside the setup() function rather than outside it or in the loop function.
  //register fucntion "buzz" to be called over REST
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  Spark.function("buzz", buzzFunc); 
}

// This routine gets called repeatedly, like once every 5-15 milliseconds.
// Spark firmware interleaves background CPU activity associated with WiFi + Cloud activity with your code. 
// Make sure none of your code delays or blocks for too long (like more than 5 seconds), or weird things can happen.
void loop() {

}
// this is the fucntion invoked by the java code running on the laptop
int buzzFunc(String number)
{
    int i = 0;
    digitalWrite(led, HIGH);   // blink on board LED 
    while ( i++<= 6){  //6 short beeps

        digitalWrite(buzzer, HIGH);
        delay(100);
 
        digitalWrite(buzzer, LOW);  
        Delay(100);
    }
    //digitalWrite(led, LOW);   // Turn ON the LED
        return 1;
}

package com.mypkg.spark;
import java.net.*;
import java.io.*;
import java.util.*;
import org.apache.http.entity.*;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;

public class FacebookGraph {

	private  static String HOST="http://graph.facebook.com/" ;// all Facebook pages start with this domain
	private static String MYPAGE = "XXXXXXXXX"; // check likes on this page
	/**
	 * @param args
	 */
	public static void main(String[] args) {
	try {
		//SendToSpark();
		// TODO Auto-generated method stub
		int likesOld = getLikes(HOST,MYPAGE);
		int likesNew;
		while ( true)
		{
			Thread.sleep(3000);
			likesNew = getLikes(HOST,MYPAGE);
			if ( likesNew > likesOld)
			{// POST call to SPARK core.
				SendToSpark();
			}
			likesOld=likesNew;
			System.out.println("facebook likes="+likesNew);
		}
		} catch ( Exception exp)
		{
			System.out.println(exp.toString());
	}
	};
	private static void SendToSpark()
	{
		try {
			HttpClient client = new DefaultHttpClient();
			HttpPost post = new HttpPost("https://api.spark.io/v1/devices/0123456789abcdef01234567_YOURDEVICE/buzz?access_token=9876987698769876987698769876987698769876_YOUR_TOKEN");
			
			HttpResponse response = client.execute(post);
			BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        	String line = "";
        	while ((line = rd.readLine()) != null) {
        		System.out.println(line);
        	}
		}
        catch (Exception exx){
        	System.out.println(exx.toString());
        }
    }
	
	
	private static int getLikes (String HOST, String MYPAGE)
	{
		int likesNum=0;
		try
		{
		URL link = new URL(HOST + MYPAGE);
        Socket s = new Socket(link.getHost(), 80);
        OutputStream theOutput = s.getOutputStream();
        // no auto-flushing
        PrintWriter pw = new PrintWriter(theOutput, false);
        // native line endings are uncertain so add them manually
        pw.print("GET " + link.getFile() + " HTTP/1.1\r\n");
        pw.print("HOST: " + "graph.facebook.com\r\n");
        pw.print("Connection: close\r\n");
        pw.print("Accept: text/plain, text/html, text/*\r\n");
        pw.print("\r\n");
        pw.flush();
        InputStream in = s.getInputStream();
        InputStreamReader isr = new InputStreamReader(in);
        BufferedReader br = new BufferedReader(isr);
//        int c;
        String response;
        while (( response = br.readLine()) != null)
        {
//        	while ((c = br.read()) != -1) {
//          	System.out.print((char) c);
//          	response = response.concat((String)c);
          
//        	} 
        	System.out.println(response);
        	int indx=response.indexOf("likes\":");
        	if (indx > -1)
        	{
        		int nextIndx = response.indexOf("\"link\":");
        		String likesString= response.substring(indx+7, nextIndx-1);
        		likesNum = Integer.valueOf(likesString).intValue();
        		break;
        	}
        }
        s.close();
		} catch (Exception ioe)
		{
			System.out.println(ioe.toString());
		}		
		return likesNum ; 
	}

}

// Define the pins we're going to call pinMode on
int led = D1; // This one is the built-in tiny one to the right of the USB jack
int blinkLed (String number) ;
int buzzer = D5;

// This routine runs only once upon reset
void setup() {
  // Initialize D0 + D5 pin as output
  // It's important you do this here, inside the setup() function rather than outside it or in the loop function.
  //register fucntion "buzz" to be called over REST
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  Spark.function("buzz", buzzFunc); 
}

// This routine gets called repeatedly, like once every 5-15 milliseconds.
// Spark firmware interleaves background CPU activity associated with WiFi + Cloud activity with your code. 
// Make sure none of your code delays or blocks for too long (like more than 5 seconds), or weird things can happen.
void loop() {

}
// this is the fucntion invoked by the java code running on the laptop
int buzzFunc(String number)
{
    int i = 0;
    digitalWrite(led, HIGH);   // blink on board LED 
    while ( i++<= 6){  //6 short beeps

        digitalWrite(buzzer, HIGH);
        delay(100);
 
        digitalWrite(buzzer, LOW);  
        Delay(100);
    }
    //digitalWrite(led, LOW);   // Turn ON the LED
        return 1;
}

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