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[on:]

Hi,

I developped an Android application that turns a smartphone into a virtual Bluetooth joystick.
The applications in the robotic field are endless: Home Automation, R/C cars, robotic arms and of course  balancing robots



By default, the device transmits data every 200ms
Data format: [STX  X  Y  ETX]  
example: [0X02  0X2A  0X30  0X03]

The application is available (for free ) here
From you smartphone, access Google Store and search for "Joystick bluetooth Commander"

This demo Arduino sketch will parse data on the serial monitor, and control the pin13 LED

Code:

// AndroLED V5
// Arduino test sketch for Joystick BT commander
// LED control for buttons + joystick echo to serial monitor

// V5.0 removed SoftwareSerial

#define    DEBUG        false
#define    ledPin       13            // LED pin
#define    STX          0x02
#define    ETX          0x03

int i=0;
byte cmd[5] = {0, 0, 0, 0,0};

void setup()  {
  Serial.begin(9600);    //  ++ should match your specific BT board baud rate ++
  pinMode(ledPin, OUTPUT);
  Serial.println("Bluetooth Commander simulation");
}

void loop() {
  if(Serial.available())  {            // received from smartphone
    delay(5);
    cmd[0] =  Serial.read();  
    if(DEBUG)  Serial.println(cmd[0]);   // to serial monitor
    if(cmd[0] == STX)  {  
      i=1;      
      while(Serial.available() && ((cmd[i]=Serial.read()) != ETX)) {
        if(i>3)  break;
        if(DEBUG)    {Serial.print(i); Serial.print(": "); Serial.println(cmd[i]);}
        i++;
      }
    }
    if(i==2)    setLED(cmd[1]);
    if(i==3)    setJoystick();  
  }
  delay(5);
}

void setLED(int LEDstatus)  {
  switch (LEDstatus) {
    case '1':
      Serial.println("Button: ON");
      digitalWrite(ledPin, HIGH);
      break;
    case '2':
      Serial.println("Button: OFF");
      digitalWrite(ledPin, LOW);
      break;
  }
}

void setJoystick()    {
  Serial.print("Joystick data:  ");
  Serial.print(cmd[1]);  
  Serial.print(", ");  
  Serial.println(cmd[2]);
}

The Hardware setup is rather straightforward, should you need additional info, just let me know

Enjoy

Edit:
Updated Arduino sketch,
 set Baud rate to default 9600
 removed softserial
For sketch upload, don't forget to disconnect board TX from Arduino D0

Edit2:
** Joystick Bluetooth Commander Version 2.3 is now compatible with Android V3.X and V4.X (Honeycomb, Ice Cream Sandwich, Jelly Bean) **

Edit3:
added   Serial.println("Bluetooth Commander simulation") in setup() for communication testing purpose

Edit4:
Joystick Bluetooth Commander Version 2.4

Four toggle buttons with visual feedback

Change Log and Arduino sketch modification: please refer to reply #51

Edit5:
Joystick Bluetooth Commander Version 2.5


Change Log: refer to reply #70

Edit6:
 Joystick Bluetooth Commander Version 3.0

** major Upgrade **
Joystick Bluetooth Commander is now a full blown two way Bluetooth communication application
Arduino sends back a button status Byte and a user defined data Byte to be displayed on the phone/tablet screen (Bot battery level is a nice candidate)

Communication protocol has changed
Joystick data is now transmitted as an integer = 2 Bytes (Most Significant Byte + Less Significant Byte)
<STX  MSB-X  LSB-X  MSB-Y  LSB-Y  ETX>
Your V2.5 Arduino sketch needs to be modified for V3.0

See full change Log at reply #74
Updated demo Arduino sketch at reply #90

Edit7:
Fixed link to Balancing robot for dummies

Edit8:
New Arduino demo sketch (V10.1)
Improve decoding algorithm, see reply #98

Edit9:
 Joystick Bluetooth Commander Version 3.1
Maintenance release, see reply #100

Edit10:
New Arduino demo sketch (V10.3)
Bug fix, see reply #129

[Reply #1 on:]

I posted a pan/tilt project based on Joystick Bluetooth Commander, in the Robotic Section

[Reply #2 on:]

I have Samsung Galaxy Tab 7" tablet and Arduino Uno. The X and Y values on the tablet screen don't display the position of the joystick and nothing is displayed on the serial monitor. How can I fix the problem?

[Reply #3 on:]

Bluetooth applications are difficult to debug in Eclipse IDE, as Virtual Devices do not emulate Bluetooth activity
Actual debugging has to be made on a specific real device (Sony Xperia Mini)

I have Samsung Galaxy Tab 7" tablet

what is your tablet API level and display resolution ??

The X and Y values on the tablet screen don't display the position of the joystick

Make sure that options are as follow:
Data Range:   -50 to +50
Data display:    Joystick position
Data format:   STX and ETX

Are the buttons and the "not connected" string displayed on the tablet screen ??
Does the Joystick actually move when touched??
does it produce haptic feedback when this option is selected ??

nothing is displayed on the serial monitor

Your Bluetooth serial board may be still configured @9600BPS
please adjust  mySerial.begin(57600) to your specific Baud rate
Also make sure that your Bluetooth serial board is already paired with your tablet

finally uncomment

Code:

//        Serial.print(i);  Serial.print(": ");  Serial.println(cmd[i]);

   
and let me know the outcome

@all
My specific configuration is working flawlessly
Should you have installed this application on a different device, please post feedback

[Reply #4 on:]

@jeffmorris
I beleave you are facing two non related problems

 - Communication with your BT card (your task)
check pairing, Baud rate, connection to Arduino (Menu/Connect)
I use a JY-MCU rev1.05 board
Onboard LED should be flashing when powered and gets solid red when connected
Connect TX board to RX (D0) Arduino


Above Arduino sketch has been updated to V5 (removed SoftwareSerial)
For sketch upload, don't forget to disconnect board TX from Arduino D0


 - UI display on tablets (my task)
I will publish today on Google Play a new version insuring compatibility with tablets

Edit: Joystick Bluetooth Commander V2.2 is now available
Please make sure that application is configured as follow:
 - Data Range  -50 to +50
 - Data display   Joystick position
 - Data format STX and ETX
 - Refresh interval   100ms
 - Button1 data to send    '1'
 - Button2 data to send    '2'

[Reply #5 on:]

The screen shown on the second screenshot at https://play.google.com/store/apps/details?id=org.projectproto.btjoystick&feature=search_result#?t=W251bGwsMSwxLDEsIm9yZy5wcm9qZWN0cHJvdG8uYnRqb3lzdGljayJd doesn't show up. How can I fix this?

[Reply #6 on:]

The X and Y values on the tablet screen don't display the position of the joystick

Can you move the joystick ??
Are the data now displayed on the tablet screen ??

The screen shown on the second screenshot at https://play.google.com/store/apps/details?id=org.projectproto.btjoystick&feature=search_result#?t=W251bGwsMSwxLDEsIm9yZy5wcm9qZWN0cHJvdG8uYnRqb3lzdGljayJd doesn't show up. How can I fix this?

The menu is displayed when pressing the hardware menu button at the bottom of your tablet
Can you access it ??

You need to enter this menu to establish a Bluetooth communication

Please let me have more detailed information

I will post a new version including a "reset configuration" option
The initial configuration should work right out of the box with the above Arduino sketch

[Reply #7 on:]

I can't find the hardware menu button at the bottom of the tablet screen. When I move the joystick, the X and Y values at the bottom left corner of the screen change. A red message at that corner says "Not Connected".

[Reply #8 on:]

Is it your model?


What happens when you launch Joystick Bluetooth Commander and press the button on the left ?

EDIT
Not sure this is the right one  
The option button is this one (red circle)

Can somebody jump in and explain how to access applications menu or options on the Galaxy Tab tablet ??

[Reply #9 on:]

I now realize that beginning with Android 3.0 (API level 11), Android-powered devices are no longer required to provide a dedicated Menu button  

Joystick Bluetooth Commander Version 2.3 now adds full compatibility with Android 3.X  and 4.X
The menu that allows BT connection can be accessed though the added 'action overflow button' (red square)

some other devices have a different icon at bottom left

thanks for bringing this point to my attention, sorry for being GingerBread centric

The application has been tested and is fully operative on my son's 7" Samsung Galaxy tablet (jelly beans)
Thanks to Julian for his contribution  

[Reply #10 on:]

The Samsung Galaxy Tab 7.0 Plus has display resolution of 1024x600.

http://www.samsung.com/global/microsite/galaxytab/7.0/spec.html?type=find

[Reply #11 on:]

OK

Just install Version 2.3, and let me know the outcome.
You should now have a Menu button available for establishing connection.


Next step is to get your BT board connected. With a JY-MCU type, the on board LED should change from blinking to solid red

[Reply #12 on:]

I think that version 2.3 works but I don't see anything on the Serial Monitor after changing #define DEBUG from false to true. I can connect my tablet to the Arduino UNO board with Bluetooth module but the Pin 13 LED doesn't work when I touch the buttons next to the "joystick". The values change when I move the "joystick". The LEDs on the Bluetooth module changed from flashing red to non-flashing green.

[Reply #13 on:]

OK

Please check those 3 points:

1) Arduino sketch
Add

Code:

Serial.println("***");

as the last line of setup()
Please confirm the stars are displayed on the serial monitor

D0 should be disconnected to allow sketch upload
(and reconnected afterward  )
   

2) Hardware connection
please refer to message #4
Only 3 wires
5V to 5V
GND to GND
TX board to D0 (Arduino RX)


3)BT board Baud rate
Some BT boards default to 19200BPS
Please adjust "Serial.begin(9600)" and Serial Monitor Baud rate accordingly
Should you require it, I will upload an Arduino sketch for checking BT board Baud rate and/or setting a new value. This sketch also insure that the BT board is OK

[Reply #14 on:]

Please send me the sketch that for checking and setting Bluetooth baud rate. I added

Serial.println("***");

as the last line of setup() and the stars show up on the serial monitor.