BlueToothAche

Goals:

1. Understand Bluetooth
2. Control light/signal
   A. arduino -> computer <------- done
   B. computer->arduino

ITP Physical Computing Tutorials

 

RS-232 Protocol

• "a series of standards for serial binary single-ended data and control signals connecting between a DTE (Data Terminal Equipment) and a DCE (Data Circuit-terminating Equipment)"
• Less complex than USB
•  introduced in 1962 

Not sure we will be directly concerned with the protocol itself - more with the content of the data being passed. Good to have an idea ^, however.

Serial port -> receive data->control arduino....hmmm, OSC?


Going through BlueTooth Code: 

unsigned int timeout=0;
unsigned char state=0;      //probably for direction of communication?

           
// ISR is not in ATMEGA2560 dasheet. Perhaps keyword for itead?
ISR(TIMER2_OVF_vect)          //Timer2  Service ISR= Interrupt Service Routine!
{
  TCNT2 = 0;                  // set timer2 to 0?
  timeout++;
  if (timeout>61)
  {
    state=1;                  //state 1 means timed-out / idle (if state is 1, we write to the serial terminal)
    timeout=0;                //reset timedout variable
  }

}

void init_timer2(void)           //initialize ... might just be standard for BT timing  
{
  //Timer Counter Control Register A
  //control the Output Compare pin (OC2A) behavior. pg 187
  TCCR2A |= (1 << WGM21) | (1 << WGM20);   // compound bitwise or, bitshifted waveform generation mode
  TCCR2B |= 0x07;   // by clk/1024
  ASSR |= (0<<AS2);  // Use internal clock - external clock not used in Arduino
  TIMSK2 |= 0x01;   //Timer2 Overflow Interrupt Enable
  TCNT2 = 0;
  sei();     // enable interrupts   
}

void setup()
{
  Serial.begin(9600);
  pinMode(2,INPUT);       //Direction/state pin
  pinMode(13,OUTPUT);
  attachInterrupt(0,cleantime,FALLING);  //(interrupt, function, mode) where function =ISR, executed on (every or one? ) falling clock
  init_timer2();
}

void loop()   // main loop .... [insert logic here]
{
  switch(state)
  {
  case 0:
    digitalWrite(13,LOW);  // Tell pin 13 to be LOW
    break;

  case 1:
    digitalWrite(13,HIGH);
    Serial.print("HackerSchool");
    break;

  }

}

void cleantime()
{
  timeout=0;
  state=0;
}

Ok, but where's the bluetooth part? ...hmm...

Interfacing Arduino and Python
David got it working with SkyBot, wired. I'm trying to do it at a lower level... Python IRC Client (LL) (More tutorial-like presentation of material here)

SideNotes - 
Installed pip and homebrew (a pleehg on ze macPooorts of FEHL)

We had lunch with the Etsy people to day... "Eatsy" :D 

Met a woman from Santa Fe!

As you enter the area, there are a couple of small rooms on your left. Perhaps they are offices, but the typewriter is a plushie. Nap room?... Yea, I'd head-desk that. 

Giant statue that reminds me of a cross between a Zelda "Deku," a "Save-Owl," and a Yedi. (Don't worry about it, non-n64-gamer folks ;))

In other news, people who compulsively mutter rather worry me.