Visualizing Facebook friends presence

I have set up a XMPP bot that connects to Facebook XMPP server, and monitors my friends login and logout operations.

For now i am only monitoring presence, but another's aspects could be easily derived and/or monitored :)

Chart values:

"1" means that the user has entered Facebook

"0" means that the user has logout

Chart lines:

"\" lines means a user session, user logins and a time after the user logs out

"/" lines like this, means the user is entering Facebook after being logged out

"V" the formed V's represent the user login and logout history

Note: this post only contains data from 15:30pm to 3:08 am, from first monitoring attempt.

Data from 15:30pm to 3:08 am

Drilling-down (zooming)

Platform raw chart page

The platform im using to upload sensor data is sawa (related to sensors), no need to create databases, just upload data and then render chart :)

SleekXMPP problems with DIGEST-MD5

I was trying to connect to facebook XMPP server using the sleekxmpp port that suports the SASL.

But was unable to connect....

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    if not challenge['realm'] or not challenge['qop'] or not challenge['nonce']: KeyError: u'realm' 

Looking at protocol http://xmpp.org/rfcs/rfc3920.html#sasl the function handler_sasl_digest_md5_auth was not handling 2 essential steps:

"Step 7: Server sends another [BASE64] encoded challenge to client:"

and

"Step 8: Client responds to the challenge:"

Solution:

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self.sendPriorityRaw("""<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl'>%s</response>""" %base64.encodestring(response)[:-1]) self.digest_auth_started = True else: logging.warn("handler_sasl_digest_md5_auth called while digest_auth_started is True (has already begun)") self.sendPriorityRaw("<response xmlns='urn:ietf:params:xml:ns:xmpp-sasl' />")

DHT11 Arduino with VirtualWire

By some reason when using VirtualWire library and using vw_setup(2000) caused the readings from humidity sensor to fail (dht11 start condition 1 not met). I looked at datasheet and changed a the times how the MCU starts to talk with the sensor.

The code is based from this post

Here is the the fixed code:

void InitDHT() {
 pinMode(TEMP_RH_PIN, OUTPUT);
 delay(1000);
 digitalWrite(TEMP_RH_PIN,HIGH);
}

void ReadDHT() {

 bGlobalErr=0;
 byte dht_in;
 byte i;
        
        // see datasheet to understand this
        pinMode(TEMP_RH_PIN, OUTPUT);
        digitalWrite(TEMP_RH_PIN,HIGH);
        
 digitalWrite(TEMP_RH_PIN,LOW);
 delay(18);

 digitalWrite(TEMP_RH_PIN,HIGH);
 delayMicroseconds(22);

 pinMode(TEMP_RH_PIN,INPUT);
 delayMicroseconds(5);

 dht_in=digitalRead(TEMP_RH_PIN);

 if(dht_in) {
  bGlobalErr=1;
  Serial.println("<dht11 start condition 1 not met");
  return;
 }
 
 delayMicroseconds(80);
 dht_in=digitalRead(TEMP_RH_PIN);

 if(!dht_in) {
  bGlobalErr=2;
  Serial.println("<dht11 start condition 2 not met");
  return;
 }
 delayMicroseconds(80);
 
        //now ready for data reception... pick up the 5 bytes coming from the sensor
 for (i=0; i<5; i++)
    dht_dat[i] = read_dht_dat();

 //Next: restore pin to output duties
 pinMode(TEMP_RH_PIN,OUTPUT);
 digitalWrite(TEMP_RH_PIN,HIGH);

 byte dht_check_sum = dht_dat[0]+dht_dat[1]+dht_dat[2]+dht_dat[3];

 /*Condition in following "if" says "if fifth byte from sensor
       not the same as the sum of the first four..."*/
 if(dht_dat[4]!= dht_check_sum) {
   bGlobalErr=3;
          Serial.println("DHT11 checksum error");   
 }

}


byte read_dht_dat() {
 //Collect 8 bits from datastream, return them interpreted
 //as a byte. I.e. if 0000.0101 is sent, return decimal 5.
 //Code expects the system to have recently entered the
 //dataline low condition at the start of every data bit's
 //transmission BEFORE this function is called.
 byte i = 0;
 byte result=0;
 for (i=0; i< 8; i++) {
  //We enter this during the first start bit (low for 50uS) of the byte
  //Next: wait until pin goes high
  while(digitalRead(TEMP_RH_PIN)==LOW);
  delayMicroseconds(30);
  if (digitalRead(TEMP_RH_PIN)==HIGH)//Was: if(PINC & _BV(dht_PIN))
  result |=(1<<(7-i));
  while (digitalRead(TEMP_RH_PIN)==HIGH);
  //Was: while((PINC & _BV(dht_PIN)));
 }
 //end of "for.."
 return result;
}

Arduino code to read lines from serial input

Here is short and useful example to read lines from serial port in Arduino.

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void setup (){ Serial.begin(9600); Serial.flush(); digitalWrite (13, HIGH); //turn on debugging LED } void loop (){ int i=0; char commandbuffer[100]; if(Serial.available()){ delay(100); while( Serial.available() && i< 99) { commandbuffer[i++] = Serial.read(); } commandbuffer[i++]='\0'; } if(i>0) Serial.println((char*)commandbuffer); }

python euromillion key generator with filters

From python, perl and ruby i selected python to start playing around (learn the language). I started with this nice tutorial "Learn Python in 10 minutes", and decided to port and old C program that generates all combinations of euromillions and then apply some filters.

The generator is for numbers only, it does not take into account the stars!!!

The solution is composed by two parts, the generator and the evaluator. The generator generates the combinations with the given filter list (e.g, python gnerator.py columns d_tens).

The evaluator, evaluates the success of the specified filters individually, and can evaluate all filters at same time.

As example the filter "first_number" rejects combinations with the first number more than 30

sh avaliator.sh first_number

################# first_numbers #####################

Running...

2044588 results 74172 rejected

~96.56160458452722063037%

###############################################

the report says that 15504 combinations was rejected and 97% of euromilions results are in the generated combinations file

However combining all filters (16 for now, and individually with 90% success), the success rate drops to 70% !!.

################# ALL #####################

Running...

1516959 results 601801 rejected

~70.77363896848137535817%

##########################################

Download here