I Am Having Fun Now

Okey doke, I am just trying things, and well, it is working. Kinda silly, but at the same time, my juices are starting flowing. The bluetooth is pretty reliable, once I figure out the switches, and such. I've tweaked the Arduino code, and have it doing something interesting.

First the bluetooth, I have the iTead Studio v2.1 bluetooth shield, which seems to be obsolete. There are two switches on the board, voltage selection, and serial port selection. The voltage selection seems to work in either 3.3V or 5V on the Arduino Mega that I am using. The input MUST be set to FT232 for uploading sketches, and in the "To Board" setting to communicate with the Android. Handy to know.

Just as a datapoint, the phone (Samsung Galaxy Note II) seems to pair with the Arduino shield better than the tablet (Samsung Galaxy Note 10.1). I don't know why. The tablet works well once connected, it is just sometimes it is finicky.

I tweaked the sketch to read from the LM34 that I have on the prototyping board from before. This is connected to the A15 pin on the Mega. I have the get data read the value and convert the voltage into something like a temprature. It is running probably 20 degrees warmer than reality if I assume the analog reference is 5V or 10 degrees cool if I assume 3.3V. All I did was put a 1K bias resistor on it, which may be too much, the datasheet shows 50-75ohm. Probably that 3.3V is fine.

 Here is my tweaked code:

/*
 PROJECT: Andruino 0.1 Alpha
 PROGRAMMER: Hazim Bitar (techbitar at gmail dot com)
 DATE: July1, 2013
 FILE: Andruino.ino
 LICENSE: Public domain
*/

#define START_CMD_CHAR '*'
#define END_CMD_CHAR '#'
#define DIV_CMD_CHAR '|'
#define CMD_DIGITALWRITE 10
#define CMD_ANALOGWRITE 11
#define CMD_TEXT 12
#define CMD_READ_ARDUINO 13
#define MAX_COMMAND 20  // max command number code. used for error checking.
#define MIN_COMMAND 10  // minimum command number code. used for error checking. 
#define IN_STRING_LENGHT 40
#define MAX_ANALOGWRITE 255
#define PIN_HIGH 3
#define PIN_LOW 2

String inText;

void setup() {
  Serial.begin(9600);
  Serial.println("Andruino 0.1 Alpha by Tommyb (2013).");
  Serial.flush();
}

void loop()
{
  Serial.flush();
  int ard_command = 0;
  int pin_num = 0;
  int pin_value = 0;
  int temp = 0;    // temprature
  float a15 = 0;  // analog pin 15 input.
  float maxAnalog = 1024;
  float trueTemp = 0.0;

  char get_char = ' ';  //read serial

  // wait for incoming data
  if (Serial.available() < 1) return; // if serial empty, return to loop().

  // parse incoming command start flag 
  get_char = Serial.read();
  if (get_char != START_CMD_CHAR) return; // if no command start flag, return to loop().

  // parse incoming command type
  ard_command = Serial.parseInt(); // read the command
  
  // parse incoming pin# and value  
  pin_num = Serial.parseInt(); // read the pin
  pin_value = Serial.parseInt();  // read the value

  // 1) GET TEXT COMMAND FROM ANDRUINO
  if (ard_command == CMD_TEXT){   
    inText =""; //clears variable for new input   
    while (Serial.available())  {
      char c = Serial.read();  //gets one byte from serial buffer
      delay(5);
      if (c == END_CMD_CHAR) { // if we the complete string has been read
        // add your code here
        break;
      }              
      else {
        if (c !=  DIV_CMD_CHAR) {
          inText += c; 
          delay(5);
        }
      }
    }
  }

  // 2) GET digitalWrite DATA FROM ANDRUINO
  if (ard_command == CMD_DIGITALWRITE){  
    if (pin_value == PIN_LOW) pin_value = LOW;
    else if (pin_value == PIN_HIGH) pin_value = HIGH;
    else return; // error in pin value. return. 
    set_digitalwrite( pin_num,  pin_value);  // Uncomment this function if you wish to use 
    return;  // return from start of loop()
  }

  // 3) GET analogWrite DATA FROM ANDRUINO
  if (ard_command == CMD_ANALOGWRITE) {  
    analogWrite(  pin_num, pin_value ); 
    // add your code here
    return;  // Done. return to loop();
  }

  // 4) SEND DATA TO ANDRUINO
  if (ard_command == CMD_READ_ARDUINO) { 
    // char send_to_android[] = "Place your text here." ;
    // Serial.println(send_to_android);   // Example: Sending text
    a15 = analogRead(A15);
    // Serial.print(" Analog 15 = "); 
    // Serial.print(a15);  // Example: Read and send Analog pin value to Arduino
    trueTemp = maxAnalog;
    trueTemp = (a15 / trueTemp); 
    Serial.print("  Temp = ");
    Serial.println(trueTemp*330.0);
    return;  // Done. return to loop();
  }
}

// 2a) select the requested pin# for DigitalWrite action
void set_digitalwrite(int pin_num, int pin_value)
{
  switch (pin_num) {
  case 13:
    pinMode(13, OUTPUT);
    digitalWrite(13, pin_value);  
    // add your code here      
    break;
  case 12:
    pinMode(12, OUTPUT);
    digitalWrite(12, pin_value);   
    // add your code here       
    break;
  case 11:
    pinMode(11, OUTPUT);
    digitalWrite(11, pin_value);         
    // add your code here 
    break;
  case 10:
    pinMode(10, OUTPUT);
    digitalWrite(10, pin_value);         
    // add your code here 
    break;
  case 9:
    pinMode(9, OUTPUT);
    digitalWrite(9, pin_value);         
    // add your code here 
    break;
  case 8:
    pinMode(8, OUTPUT);
    digitalWrite(8, pin_value);         
    // add your code here 
    break;
  case 7:
    pinMode(7, OUTPUT);
    digitalWrite(7, pin_value);         
    // add your code here 
    break;
  case 6:
    pinMode(6, OUTPUT);
    digitalWrite(6, pin_value);         
    // add your code here 
    break;
  case 5:
    pinMode(5, OUTPUT);
    digitalWrite(5, pin_value); 
    // add your code here       
    break;
  case 4:
    pinMode(4, OUTPUT);
    digitalWrite(4, pin_value);         
    // add your code here 
    break;
  case 3:
    pinMode(3, OUTPUT);
    digitalWrite(3, pin_value);         
    // add your code here 
    break;
  case 2:
    pinMode(2, OUTPUT);
    digitalWrite(2, pin_value); 
    // add your code here       
    break;      
    // default: 
    // if nothing else matches, do the default
    // default is optional
  } 
}

Whatcha think, any thing I ought to be fiddling with?