Arduino Remote Control Outlet

Today i bought an remote control outlet kit from avidsen (2 adapters + remote control)

Using the library and info from here and here, was possible to decode the on/off codes.

After finding these codes, i added and actuator to the platform with two functions on() and off()

Electric water heater

Outlet adapter

Outlet adapter and remote control

Actuator in system

Mobile version

New update: i was forgetting one important thing, set a policy to turn on water heater between 7 am and 8 am and turn off after 8 am.

My policies in system

turn_heater_on policy info

Preparing Arduino Bug Zapper

Objectives:

Detect when a bug is killed

Send data to server

Testing ATmega 328 with Arduino bootloader

No PCB :(

Bug Zapper racket

Next steps:

Attach Electret Microphone [link]

Attach 315MHz Transmitter module [link]

Calibration

Add everything to racket inside

TMN A1 or Huawei U8230, switch applications, task list, recent applications

Use combination

off+menu

then choose "recent applications"

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); }