Hello,

My aim is to have 2 transmitters sending serial data to receiver connected to PC via Xbee Explorer board.
I am using XBee "Series 1" modules.

My setup is as follows:
Arduino (AD) powered using USB and XBee (XB) attached to self-made shield (powered using AD_3V3).

I am using NewSoftSerial library for communication at 9600 baud rate to avoid interference with FTDI.
So, i have attached the XB_DIN pin to AD3 pin.

My XB's configuration tested till now:
(Just point to point to test)

1)
XBeeTX: DL-1, MY-2 (Arduino)
XBeeRX: DL-2, MY-1 (PC)
(PAN-3332, BD-9600)

2)
XBeeU: DL-1, MY-2 (Arduino)
XBeeD: DL-2, MY-1, CE-1 (PC)
(PAN-3332, BD-9600)

Both the above configuration are "not working".

In order to confirm whether my hardware is working or not, I tested it with my "Series 2" modules lying around.
And the setup works with them.

Then, i changed the firmware to XB24-DM (XBee Digimesh) and configured them as follows:

Receiver:
PAN-1234
SH-13A200
SL-4064036E
DH-0
DL-FFFF

Transmitter
PAN-1234
DH-13A200
DL-4064036E

And surprisingly it does not work too.

Please help me to debug this.

Regards-
Aadeesh

Code:

#include <NewSoftSerial.h>

NewSoftSerial softSerial(2, 3);

unsigned int prevValue = 0;
unsigned int newValue = 0;

void setup()
{
  softSerial.begin(9600);
  pinMode(13, OUTPUT);
}

void loop()
{
  newValue = analogRead(0);  // Read Potentiometer A (0 to 1023)
 
  //softSerial.println("Working !");
 
  // Send if potentiometer values is changed
  // If loops are to set the tolerance limits of the digital potentiometer values
  if (newValue != prevValue)
  {
    if ((newValue - 1) != prevValue)
    {
      if((newValue + 1) != prevValue)
      {
        if((newValue - 2) != prevValue)
        {
          if((newValue + 2) != prevValue)
          {
            if((newValue - 3) != prevValue)
            {
              if((newValue + 3) != prevValue)
              {
                digitalWrite(13,HIGH);
                softSerial.print("NODEA ");
                softSerial.println(newValue);
                prevValue = newValue;
                digitalWrite(13,LOW);
              }
            }
          }
        } 
      }
    } 
  }
 
  delay(20);
}

References:
http://www.wsncloud-murdoch.org/wiki/index.php/Wireless_Communication#Wireless_Mesh_Network
http://www.kobakant.at/DIY/?p=270

@markbee
It is because Xbee with DL=0 (Coordinator) should listen to multiple End Devices in range.

Thanks Paul. I have re-configured the laptop's XBee by changing the DL value to 2.
But unluckily it does not work.

I Google-d about this issue and found the following project:

http://www.kobakant.at/DIY/?p=270

The configuration is pretty same as of mine, unlike i am using XBee's in transparent mode.

Any more suggestions ?

Regards,
Aadeesh

Hello,

I am trying to send two potentiometer values connected to two arduinos to a laptop.
So i am using Xbee 802.15.4 (Series 1) modules for the purpose.

My setup is as follows:

Transmitter:
ArduinoTx (Pin3 NewSoftSerial) ===> XbeeDin     //Using NewSoftSerial to avoid conflicts with USB as i am not using the Xbee Shield
Arduino3V3 ===> XbeeVDD
ArduinoGND ===> XbeeGND
Arduino Powered using Laptop's USB port

Laptop:
Xbee connected to FT232 Xbee Adapter Board

My Xbee Configurations:

ArduinoXBEE
(XB24, 802.15.4, 10E8)
ID = 9898
DH = 0
DL = 1
MY = 2
BD = 5 (38400)

LaptopXBEE
(XB24, 802.15.4, 10E8)
ID = 9898
DH = 0
DL = 0
MY = 1
CE = 1 (Cordinator Enable)
BD = 5 (38400)

It worked for the first time. But when i powered off both arduino and laptop's xbee, it does not work.
I tested the same setup with my other Series 2 modules and it works.

Is my above Xbee configuration correct ?

Any help will be appreciated.

This looks like two conflicting statements, the first saying that things work as expected using the serial monitor, and the second saying things don't work as expected using the serial monitor.

Ya you are right. But in first case, servo move when only ONE "A120,34,89,50" string is sent using serial monitor.

BUT when MORE (3 strings) "A120,34,89,50,A50,74,90,150,A44,132,49,80" are sent using serial monitor, i could parse the data, but servos dont move.

How do you have the receiving xbee connected to the arduino? If you have the tx/rx connections reversed, that might be the problem.

I am connecting the receiving Xbee directly to arduino (DOUT->Rx and DIN->Tx). Connections are fine.

I think its the code (Tx or Rx) problem (MAY be of delay) that i am unable to figure out.

Does the sent data get properly echoed back?

Yes, the data is parsed (echoed) properly. But the servos are not moving.

[setup]

@zoomkat

I have made some changes to my transmitter and receiver code.
Here is tx and rx code -

//Transmitter

const int HR= 0;        // Joystick Horizontal Axis
const int VR = 1;        // Joystick vertical Axis
const int HL = 2;
const int EL = 4;

int servoVal1;
int servoVal2;
int servoVal3;
int servoVal4;

 
void setup()
{
  Serial.begin(9600);
}
 

void loop()
{

    Serial.print('A',BYTE);
    servoVal1 = analogRead(HR);          
    servoVal1 = map(servoVal1, 0, 1023, 0, 180);
    Serial.print(servoVal1);
    delay(10);
    Serial.print(',');  
    servoVal2 = analogRead(VR);          
    servoVal2 = map(servoVal2, 0, 1023, 0, 180);
    Serial.print(servoVal2);
    delay(10);
    Serial.print(',');  
    servoVal3 = analogRead(EL);          
    servoVal3 = map(servoVal3, 0, 1023, 0, 180);
    Serial.print(servoVal3);
    delay(10);
    Serial.print(',');  
    servoVal4 = analogRead(HL);          
    servoVal4 = map(servoVal4, 0, 1023, 0, 180);
    Serial.print(servoVal4);
    delay(10);
    Serial.print(',');  
 
}

//Receiver

#include <WString.h> //provides easy string handling
String readString = String(100);
String parce1 = String(10);
String parce2 = String(10);
String parce3 = String(10);
String parce4 = String(10);
int pos = 0;
int ind1 = 0;
int ind2 = 0;
char d;
String arr[4] = String(10);

#include <Servo.h>
Servo myservo1;
Servo myservo2;
Servo myservo3;
Servo myservo4;

void setup() {
      Serial.begin(9600);
        myservo1.attach(6);
        myservo2.attach(9);
        myservo3.attach(10);
        myservo4.attach(11);
        }
     

void loop() {

        //expect a string like wer,qwe rty,123 456,hyre kjhg,
       while (Serial.available())
      {
       delay(10);

       char c = Serial.read();  //gets one byte from serial buffer
       
       if(c=='A')
       {
         while(Serial.available())
         {
            d=Serial.read();
           if(d==',')
             break;
           parce1.append(d);         
         }
         Serial.print("First Servo=");
         Serial.println(parce1);
         while(Serial.available())
         {
            //parce2.append(d);
            d=Serial.read();
            if(d==',')
               break;
            parce2.append(d);         
         }
       
       Serial.print("Second Servo=");
       Serial.println(parce2);
         while(Serial.available())
         {
            //parce2.append(d);
            d=Serial.read();
            if(d==',')
               break;
            parce3.append(d);         
         }
         Serial.print("Third Servo=");
         Serial.println(parce3);
         while(Serial.available())
         {
            //parce2.append(d);
            d=Serial.read();
            if(d==',')
               break;
            parce4.append(d);         
         }
         Serial.print("Fourth Servo=");
         Serial.println(parce4);
         int p1,p2,p3,p4;
                p1 = atoi(parce1); //convert string to number
                p2 = atoi(parce2);
                p3 = atoi(parce3);
                p4 = atoi(parce4); 
                myservo1.write(p1);
                delay(10);
                myservo2.write(p2);
                delay(10);
                myservo3.write(p3);
                delay(10);
                myservo4.write(p4);
                delay(10);
         parce1='\0';
         parce2='\0';  
         parce3='\0';
         parce4='\0';
       }
 }
   }

The problem is, that when i send a string like A120,34,89,50 through the serial monitor of arduino, the servos move. But when the same string are transmitted via Xbee, there is no movement of servos.

I tried passing many strings like A120,34,89,50,A50,74,90,150,A44,132,49,80 on the serial monitor of arduino the servos DONT even move.

okay.. Separating the joysticks values with a 'comma' (or any other delimiter in that case) would be a better option...

Looking for <,> and store the strings in different variables and pass them to the servos... I will try with your code... thanks


Others comment are also welcome..
Aadeesh

Hello guys...

From several days, i am trying to control the movement of 3 servos and ESC for my aircraft using thumb joysticks and xbee series 2 modules..

I tested it using direct wire control and it was just fine..

Now, i am using xbee for wireless transmission..

I could established the serial communication between the two arduinos (Diecimila) and verified the joystick values on the terminal of XCTU.



Now the problem is how can i decode the values of joysticks on the receiver end..

My transmitter end sketch is

Code:

/*
****Transmitter****
Just an extended version of AnalogInSerial example code

Sketch: Joystick control of RC servos using Xbee modules
*/


 void setup() {
  Serial.begin(9600);
 }
 
 void loop() {

/******* Vertical Left Joystick *******/

   int analogValue0 = analogRead(0);
   //analogValue0=map(analogValue0,0,1023,0,180);
  
   // print the result:
   Serial.print('A',BYTE);      // Sync char
   Serial.println(analogValue0,BYTE);
  
   // wait 10 milliseconds for the analog-to-digital converter
   // to settle after the last reading:
   delay(10);
  
/******* Vertical Right Joystick *******/

   int analogValue1 = analogRead(1);
   //analogValue1=map(analogValue1,0,1023,0,180);
  
   Serial.print('B',BYTE);      // Sync char
   Serial.println(analogValue1,BYTE);
  
   delay(10);
  
/******* Horizontal Right Joystick *******/
  
   int analogValue2 = analogRead(2);
   //analogValue2=map(analogValue2,0,1023,0,180);
  
   Serial.print('C',BYTE);  // Sync char
   Serial.println(analogValue2,BYTE);      
  
   delay(10);

/******* Electronic Speed Control *******/

   int analogValue3 = analogRead(3);
   //analogValue3=map(analogValue3,0,1023,0,180);

   Serial.print('D',BYTE);   // Sync char
   Serial.println(analogValue3,BYTE);  

   delay(10);

}

I just tried making changes in the receiver sketch from http://lab.guilhermemartins.net/2008/12/24/serial-comunication-with-xbee-arduino/ but it did'nt worked for me..

So the problem is how do i parse the sync characters (A,B,C,D) from the incoming bytes, so that i can map the values to servos ?
OR You can suggest me some other logic to this.

Well, this is my Remote Control !!!



Any help would be appreciated..
Aadeesh

okay i got it now...

I ll do the said and let u know !

2. wire a jumper from pin 0 to pin 1. This will cause a loop-back connection.

@retrolefty
Which pins (pin 0 & pin 1) are you talking about ? I checked schematic but i could not get pin 0 and pin 1 labeled anywhere !

5. If you don't see data coming back, time for a scope to see which direction the serial data is failing.

I will check it and let you know !

I called the dealer and asked for a solution... He replaced the chip with a new one...

But when he tried to program the chip, using my hardware, the same error appeared.

So now, i have a problem with my hardware (i think so)... Bcoz, i tested the board with the bootloader default blinking LED program on D13 and it works well but while programming the chip i get the same error....

I have used the transistor version of the Arduino Serial Board...
How can i debug my problem ?

I got my Atmega168 from on of the dealer of arduino.

Now i am having some other problem...
I am facing problems in uploading the sketch...

I have the troubleshooting guide.. tried all the options provided, but still unsuccessful...

Operating System: Windows XP
Arduino Board: Serial
Controller: Atmega168

I am geeting an error which says this:

avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

Please help !

Is there any tutorial for the same ?

Hello guys,
I have build a simple AVR programmer
(http://electronics-diy.com/avr_programmer.php).

Can i use this to burn the arduino bootloader on my atmega168 chip using the arduino 0018 software itself ?

I am using Serial version of arduino...
http://arduino.cc/en/Main/ArduinoBoardSerial