Patrick Wang

In the previous post, I had code to read a temperature sensor.  http://www.ph0t0n.com.au/arduino-bluetooth-with-temperature-sensor/ . The sensor was attached to an Arduino bluetooth board. Now, with the code below, we’ll have the temperature data sent to your mobile phone and your phone can now become ‘sensor’. As a bonus, when you press your number ’5′ key on your mobile phone, after you have begun reading the temperature, you will be able to input a mobile phone number, and then send the temperature information is someone!

For this, we used Mobile Processing http://mobile.processing.org/.Based off Processing, it simplifies java based mobile phone application development by A LOT as you will see with the code below.

When the Arduino bluetooth board transmits anything, it will be received as byte data ( 8 bits for 1 byte).  Therefore some conversion is needed before we can make sense of the values.

Below is the code. But here is a zip file of the code, and midlet files, so you can install onto your Java based phone. mobile_BT_temperature_withMSGv2_forWeb

//Me holding the temperature sensor an affecting the reading

//Adapted from Adrian Lombard and Dr. Andy Dong.
//By Patrick Wang. B.Design Computing. University of Sydney. October 2010.

import processing.bluetooth.*;
import processing.messaging.*;
/*Have had problems with Mobile Processing messaging.
Would not allow me to send to some devices. I could send to Nokia based devices
but nothing received on iPhones or Android based phones*/

import javax.wireless.messaging.*;    //This library is better

import java.io.*;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;

Bluetooth bt;                      //new bt device
Service[] services;

PFont font;

int state;
String msg;
Client c;

Messenger m;

final int STATE_START = 0;   //different states, similiar to events.
final int STATE_FIND  = 1;    //find devices
final int STATE_HOST  = 2;
final int STATE_PLAY  = 3;    //once connected to device

byte[] inBuffer = new byte[2];  //store the bytes read from arduino in array.
//For the temperature sensor, there are only two digits, e.g 2 and 0 for temperature 20 C

SendMessage sm;

String message;
int counter;

void setup() {
font = loadFont();
textFont(font);
bt = new Bluetooth(this, 0x1101);
m = new Messenger(this);

sm = new SendMessage();
counter = 1;
}

void draw() {
background(255);

if (state == STATE_START) {
fill(0);
textAlign(LEFT);
text("Arduino Bluetooth 2 Mobile Phone. \n1. Find ArduinoBT", 2, 2, width - 4, height - 4);
}
else if (state == STATE_FIND) {
fill(0);
textAlign(LEFT);
if (services == null) {
text("Looking for an ArduinoBT...\n\n" + msg, 2, 2, width - 4, height - 4);
}
else {
String list = "ArduinoBT found\n\n";
for (int i = 0, length = length(services); i < length; i++) {
list += i + ". " + services[i].device.address + "\n";      //this will list discovered devices
}
text(list, 2, 2, width - 4, height - 4);
}
}

else if (state == STATE_PLAY) {
c.readBytes(inBuffer);     //Assigning assign the readBytes data into the inBuffer array for storing.
String data = new String(inBuffer);        //change the byte values into strings data
if (inBuffer != null) {
text("Current Temperature: " + data, 2, 2, width - 4, height - 4);             //draw the message
}
text("Current Temperature: " , 2, 2, width - 4, height - 4);
}
}

void libraryEvent(Object library, int event, Object data) {
if (library == bt) {
switch (event) {
case Bluetooth.EVENT_DISCOVER_DEVICE:
msg = "Found device at: " + ((Device) data).address + "...";
break;
case Bluetooth.EVENT_DISCOVER_DEVICE_COMPLETED:
msg = "Found " + length((Device[]) data) + " devices, looking for service...";
break;
case Bluetooth.EVENT_DISCOVER_SERVICE:
msg = "Found ArduinoBT service on " + ((Service[]) data)[0].device.address + "...";
break;
case Bluetooth.EVENT_DISCOVER_SERVICE_COMPLETED:
services = (Service[]) data;
msg = "Search complete.";
break;
case Bluetooth.EVENT_CLIENT_CONNECTED:
c = (Client) data;
state = STATE_PLAY;
break;
}
}
}

void keyPressed() {
if (state == STATE_START) {
switch (key) {
case '1':                      //if keyPressed is equal 1.
services = null;            // it will begin the search
bt.find();                  //bt.find goes through the whole process of bluetooth searching
state = STATE_FIND;
msg = "Looking for ArduinoBTs...";
break;
}
}
else if (state == STATE_FIND) {        //this section will help connect to which device is found
if (services != null) {
if ((key >= '0') && (key <= '9')) {
int i = key - '0';
if (i < length(services)) {
msg = "connecting...";
c = services[i].connect();
state = STATE_PLAY;
msg = "ready";
}
}
}
}
else if ( state == STATE_PLAY) {
String data = new String(inBuffer);        //change the byte values into strings data
if (keyPressed) {
if (key == '5') {
try {
String mob;      //declaring string for mobile phone number
mob = textInput("Enter Phone Number","+61",12);    //+61 is country code for AUS
sm.sendSMSData(mob, "Current Temperature: " + data);
counter++;
}
catch (java.io.IOException err) {
//must have this here to catch exception errors.
}
}
}
}
}

void destroy() {
bt.stop();
}

public class SendMessage
{
public SendMessage() {
}
void sendSMSData(String address, String msg) throws IOException
{
MessageConnection smsconn = null;

address = "sms://" + address;

try
{
smsconn = (MessageConnection)Connector.open(address);
TextMessage tmsg = (TextMessage)smsconn.newMessage(MessageConnection.TEXT_MESSAGE);
tmsg.setAddress(address);
tmsg.setPayloadText(msg);
smsconn.send(tmsg);
}
catch (java.io.IOException err)
{

}
catch (java.lang.SecurityException e)
{

}
catch (java.lang.IllegalArgumentException iae)
{

}

if (smsconn != null)
{
try
{
smsconn.close();
}
catch (IOException ioe)
{
}
}
}
}