Urgent help with arduino xbee code

Projects General Guidance
1

Hi Guys!
Im into the last phase of my final year project and things are not looking good.
I have an ultrasonic sensor that is connected to an arduino uno and an xbee series 2 mounted onto the uno via a xbee shield. The xbee is configured as Router AT mode while the Coordinator is in API mode.

I am able to get response from the sensor in the coordinator but the values are wrong. Could someone point to me what i am doing wrong here.

Router (Ultrasonic Sensor Node)

#include "LCD4884.h"
#include <XBee.h>

// Xbee initialisation
XBee xbee = XBee();
uint8_t text[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

// Address of receiving Xbee
XBeeAddress64 remoteAddress = XBeeAddress64(0x0013a200, 0x408b60eb); 
ZBTxRequest zbTx = ZBTxRequest(remoteAddress, text, sizeof(text));

// Variables
const int sensorPin = 7;
int tonePin = 10;
int RedPin = 11;
int YellowPin = 12;
int GreenPin = 13;
int duration;
int distance;
int id = 0;


void setup() {
  lcd.LCD_init();
  lcd.LCD_clear();

  Serial.begin(9600);
  xbee.setSerial(Serial);

  // Pinmodes
  pinMode(sensorPin, OUTPUT);
  pinMode(sensorPin, INPUT);
  pinMode(RedPin, OUTPUT);
  pinMode(YellowPin, OUTPUT);
  pinMode(GreenPin, OUTPUT);
  pinMode(tonePin, OUTPUT);
}

void loop()
{
  long duration, cm;
  pinMode(sensorPin, OUTPUT);
  digitalWrite(sensorPin, LOW);
  delayMicroseconds(2);
  digitalWrite(sensorPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(sensorPin, LOW);

  //Compute distance
  pinMode(sensorPin, INPUT);
  duration = pulseIn(sensorPin, HIGH);

  // convert the time into a distance
  distance = duration/56.5;
  Serial.println(distance);
  delay(50);

  // Transfer distance to payload
  text[0] = distance >> 8 & 0xff;
  text[1] = distance & 0xff;
  xbee.send(zbTx);

  //Print data on LCD 4884
  lcd.LCD_clear();
  if (distance >= 20 )
  {
    char tempString[12];
    lcd.LCD_write_string(28, 2, "Water", MENU_NORMAL);
    lcd.LCD_write_string(28, 3, "Level", MENU_NORMAL);
    lcd.LCD_write_string(36, 4, "OK", MENU_NORMAL);
  }
  else { 
    char tempString[12];
    sprintf(tempString, "=%3d cms", distance);
    lcd.LCD_write_string(15, 1, "Distance", MENU_NORMAL);
    lcd.LCD_write_string(15, 2, "Measuring", MENU_NORMAL);
    lcd.LCD_write_string(15, 4, tempString, MENU_NORMAL);
    delay (100);
  }

  //Turn ON LED and Buzzer
  if (distance > 0 && distance <= 10) {
    digitalWrite(RedPin, HIGH);
    digitalWrite(YellowPin, LOW);
    digitalWrite(GreenPin, LOW);
    tone(tonePin, 200000, 200);
  } 
  else if (distance >= 11 && distance <= 20) {
    digitalWrite(RedPin, LOW);
    digitalWrite(YellowPin, HIGH);
    digitalWrite(GreenPin, LOW);
    tone(tonePin, 5000, 200);
  } 
  else if (distance >= 21) {    
    digitalWrite(RedPin, LOW);
    digitalWrite(YellowPin, LOW);
    digitalWrite(GreenPin, HIGH);
    delay(1000);
    noTone(tonePin);
  }
}

Coordinator Code

#include <SPI.h>
#include <XBee.h>

// Xbee initialisation
XBee xbee = XBee();
XBeeResponse response = XBeeResponse();
ZBRxResponse zbRx = ZBRxResponse();
Rx64Response rx64 = Rx64Response();

uint8_t text[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; //initialises the data array with 0s

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

void loop(){
  // Read Xbee data
  xbee.readPacket();
  
  // Check packet 
  if (xbee.getResponse().isAvailable()) {
    if (xbee.getResponse().getApiId() == ZB_RX_RESPONSE) {
      xbee.getResponse().getZBRxResponse(zbRx);
    // read available message into text
     for (int i = 0; i < zbRx.getDataLength(); i++) {
         
          text [i] = zbRx.getData(i);
    } 
      
         int distance1 = text[0] ;
         //Serial.print(distance1);
         int distance2 = text[1] ;
        // Serial.println(distance2);
        int distance3 = distance2 + (distance1 * 256);
        //Serial.println(distance3);       
    }
  }

I am really in need of help pls!
Regards
Eddie

2

Any clue guys?

3

If you attach the PC and USB to the Arduino with the sensor and the XBee, and Print the values, are they correct ?

I think you are saying that they are correct at the sender end???

So this would imply that you have issues sending the data.

If so, I'd initially send some fixed data i.e not the real data from the sensor, and see what comes out at the receiving end.

Get it working with fixed data first and once you have that working, then change the code on the sending side of things to send your real data ie the sensor data.

4

Hi roger,

Thanks for the heads up. Why didn't i think of that? =(

Will try the fixed data and see if the receive side is ok.

Thanks!