Xbee to Xbee Communication // Propeller Activity Board // 2-axis Joystick // C

arlandianto · 2014-10-28 21:07

Hi all,

First of all, I'm quite new to Propeller Activity Board and XBee but I'm quite familiar with C programming.
Right now, I have 2 Propeller Activity Board, 2 Xbee 802.15.4 modules, and a 2-axis joystick.

Then I'm stumbled upon this website: http://tymkrs.tumblr.com/post/28632622791/making-a-2-axis-joystick-wireless-w-xbee
And I would really love to try this with my Activity board but in C Language instead of SPIN Language.

I've followed this tutorial as well: http://learn.parallax.com/propeller-c-simple-protocols/full-duplex-serial
Which is very nice, but I am still can't figure out how to communicate between two activity board in C language.

Any suggestion or help perhaps? There are no many learning tutorials using Xbee and Propeller C that I aware of...
Thank you!

JonnyMac · 2014-10-28 22:34

If you're familiar with C, porting from Spin should be no trouble at all -- dig in and have some fun. I don't like C very much, but I understand it well enough to port C programs to Spin all the time. Essential programming concepts apply across languages.

Genetix · 2014-10-29 02:14

Propeller C is only a year old so that's why most of the code is still in Spin.
This might help:
http://learn.parallax.com/propeller-c-simple-devices/joystick

What exactly is it that you want to do? Usually one device with be the base unit and the other the remote. For example controlling a robot with the joystick.
This might help but all the examples use Spin.
http://www.parallax.com/sites/default/files/downloads/122-32450-XBeeTutorial-v1.0.1.pdf

Here are some other examples:
http://learn.parallax.com/projects/propeller-C-language

ValeT · 2014-10-29 04:01

arlandianto wrote: »

Hi all,

First of all, I'm quite new to Propeller Activity Board and XBee but I'm quite familiar with C programming.
Right now, I have 2 Propeller Activity Board, 2 Xbee 802.15.4 modules, and a 2-axis joystick.

Then I'm stumbled upon this website: http://tymkrs.tumblr.com/post/28632622791/making-a-2-axis-joystick-wireless-w-xbee
And I would really love to try this with my Activity board but in C Language instead of SPIN Language.

I've followed this tutorial as well: http://learn.parallax.com/propeller-c-simple-protocols/full-duplex-serial
Which is very nice, but I am still can't figure out how to communicate between two activity board in C language.

Any suggestion or help perhaps? There are no many learning tutorials using Xbee and Propeller C that I aware of...
Thank you!

The following code will allow you to remote control your ActivityBot over XBee wireless. I am going to write a tutorial for this soon; sorry I don't have it done yet!

Use this link to setup the joystick module. http://learn.parallax.com/propeller-c-simple-devices/joystick

Please connect the Joystick to A/D pins 2 and 3.

Here is my code for the Activity Board ( transmitter ):

//ActivityBoard code here


#include "simpletools.h"                      // Include simple tools
#include "fdserial.h"
#include "adcDCpropab.h"


fdserial *xbee; //Initialize the full-duplex serial connection over XBee


int main()
{
  xbee = fdserial_open( 9, 8, 0, 9600 ); //open the serial connection
  adc_init( 21, 20, 19, 18 ); //initialize the analogue connections for the joystick


  float lrV, udV; //create 2 float values for incoming joystick values


  while ( 1 )
  {
    udV = adc_volts( 2 ); //get values from the joystick
    lrV = adc_volts( 3 );


    if ( udV < 1.00 ) //if joystick going backward, send backward value
    {
      dprint( xbee, "b" );
    } else if ( udV > 4.00 ) //if joystick going forward, send forward value
    {
      dprint( xbee, "f" );
    } else if ( udV < 4.00 && udV > 1.00 && lrV < 4.00 && lrV > 1.00 ) //if joystick is in center, send stop value
    {
      dprint( xbee, "s" );
    } else if ( lrV < 1.00 ) //if joystick is going left, send left value
    {
      dprint( xbee, "l" );
    } else if ( lrV > 4.00 ) //if joysitck is going right, send right value
    {
      dprint( xbee, "r" );
    }


    pause( 50 ); //only need to check joystick values 20 times a second
  }
}

Here is my code for the other Activity Board ( receiver ):

//ActivityBot code here


#include "simpletools.h"                      // Include simple tools
#include "fdserial.h"
#include "abdrive.h"


fdserial *xbee;


int main()                                    // Main function
{
  xbee = fdserial_open( 9, 8, 0, 9600 );


  char c;


  while ( 1 )
  {
    c = fdserial_rxChar( xbee );
 
    if ( c == 'f' )
    {
      drive_speed( 64, 64 );
    } else if ( c == 'b' )
    {
      drive_speed( -64, -64 );
    } else if ( c == 'l' )
    {
      drive_speed( 0, 64 );
    } else if ( c == 'r' )
    {
      drive_speed( 64, 0 );
    } else if ( c == 's' )
    {
      drive_speed( 0, 0 );
    }
  }
}

arlandianto · 2014-10-29 07:26

Thank you! I'll try to dig in and learn more from those

arlandianto · 2014-10-29 07:32

ValeT wrote: »

The following code will allow you to remote control your ActivityBot over XBee wireless. I am going to write a tutorial for this soon; sorry I don't have it done yet!

Use this link to setup the joystick module. http://learn.parallax.com/propeller-c-simple-devices/joystick

Please connect the Joystick to A/D pins 2 and 3.

Here is my code for the Activity Board ( transmitter ):

//ActivityBoard code here


#include "simpletools.h"                      // Include simple tools
#include "fdserial.h"
#include "adcDCpropab.h"


fdserial *xbee; //Initialize the full-duplex serial connection over XBee


int main()
{
  xbee = fdserial_open( 9, 8, 0, 9600 ); //open the serial connection
  adc_init( 21, 20, 19, 18 ); //initialize the analogue connections for the joystick


  float lrV, udV; //create 2 float values for incoming joystick values


  while ( 1 )
  {
    udV = adc_volts( 2 ); //get values from the joystick
    lrV = adc_volts( 3 );


    if ( udV < 1.00 ) //if joystick going backward, send backward value
    {
      dprint( xbee, "b" );
    } else if ( udV > 4.00 ) //if joystick going forward, send forward value
    {
      dprint( xbee, "f" );
    } else if ( udV < 4.00 && udV > 1.00 && lrV < 4.00 && lrV > 1.00 ) //if joystick is in center, send stop value
    {
      dprint( xbee, "s" );
    } else if ( lrV < 1.00 ) //if joystick is going left, send left value
    {
      dprint( xbee, "l" );
    } else if ( lrV > 4.00 ) //if joysitck is going right, send right value
    {
      dprint( xbee, "r" );
    }


    pause( 50 ); //only need to check joystick values 20 times a second
  }
}

Here is my code for the other Activity Board ( receiver ):

//ActivityBot code here


#include "simpletools.h"                      // Include simple tools
#include "fdserial.h"
#include "abdrive.h"


fdserial *xbee;


int main()                                    // Main function
{
  xbee = fdserial_open( 9, 8, 0, 9600 );


  char c;


  while ( 1 )
  {
    c = fdserial_rxChar( xbee );
 
    if ( c == 'f' )
    {
      drive_speed( 64, 64 );
    } else if ( c == 'b' )
    {
      drive_speed( -64, -64 );
    } else if ( c == 'l' )
    {
      drive_speed( 0, 64 );
    } else if ( c == 'r' )
    {
      drive_speed( 64, 0 );
    } else if ( c == 's' )
    {
      drive_speed( 0, 0 );
    }
  }
}

WOW! THANK YOU!
This is very helpful!
Luckily i have one ActivityBot as well and I'll definitely try this one out

Looking forward for your tutorial as well!

ValeT · 2014-10-31 04:57

arlandianto wrote: »

WOW! THANK YOU!
This is very helpful!
Luckily i have one ActivityBot as well and I'll definitely try this one out

Looking forward for your tutorial as well!

Sorry for the late reply. Recently I've gotten really busy with FTC.

Thanks! I will have the tutorial posted tomorrow or Sunday.

Let me know if you have any issues as I am always available to help.

Xbee to Xbee Communication // Propeller Activity Board // 2-axis Joystick // C

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