Parallax 32440 Manuale utente

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XBee Wireless Pack KickStart (#32440)

What It Can Do

•Uses a radio link to wirelessly connect two (or more) microcontrollers or other devices, with a

range of up to 300 feet*

•Supports the industry-standard IEEE 802.15.4 communications protocol

•Included USB adapter board allows direct connection to a PC

*Effective range depends on numerous factors, such as use indoors or outdoors, antenna type,

data speed, obstacles, and nearby objects or equipment that may reflect or interfere with radio

transmission. Indoor range may be reduced to 100 feet or less, depending on building

construction.

The XBee® Wireless Kit contains two self-contained radio transceivers, enabling two devices,

like a microcontroller and sensor, to wirelessly communicate at data rates of up to 115,200 baud

— 9,600 baud is the default, and is fast enough for most applications. The XBee Wireless Kit

can be used to transmit sensor data from one microcontroller to another or from a

microcontroller to a personal computer. The remote transmitting station can be located in a

different room, even outdoors.

The XBee Wireless Kit comes with the following components in one package:

•(2) Series 1 XBee transceiver modules, with internal PCB-mounted antenna

•(1) 3.3/5V (dual voltage) breadboard adapter

•(1) USB breadboard adapter

•(4) Breakaway headers

Some assembly is required before you can use the XBee Wireless kit. Use a pair of small pliers

to break the two 22-pin header strips in half — this results in four (4) strips, each with 11 pins.

Use a 25-30 watt soldering pencil to solder the headers onto the two adapter boards. For detailed

steps refer to the illustrated documentation for the boards; see For More Information, at the end

of this document.

The XBee Series 1 (“S1”) transceivers are factory set to communicate with one another without

the need to modify built-in settings. This simplifies their use, but imposes some restrictions, such

as slower communications speed, and the number of XBee transceivers that can be operating

simultaneously.

This KickStart assumes you are using only two XBee Series 1 transceivers at a time, and have

not changed their factory settings. For more advanced use of XBee transceivers see the book

Getting Started with XBee RF Modules (see For More Information).

Parts List

•XBee Wireless Kit

•BASIC Stamp HomeWork Board, Propeller QuickStart, or Arduino Uno microcontroller (with

solderless breadboard, as needed)

•Additional solderless breadboard

•22 gauge solid conductor hookup wire

Basic Wiring

•Power requirements: 3.3 or 5 VDC

•Communication: Serial pass-through to XBee module

Program KickStarts

The example programs send data that you type on your PC keyboard from a local XBee

transceiver to a remote transceiver. Keys you press are then echoed back, and displayed in a

serial monitor window – press the Akey and you see the letter Ain the serial monitor.

For the purposes of demonstration, the remote transceiver is wired in loopback mode — its Data

Out (DOUT) and Data In (DIN) pins are connected together. Whatever data the remote XBee

receives is simply sent back (“echoed”) to you. This way you don’t need a microcontroller on the

remote module just to demonstrate communicating between two XBee transceivers.

BASIC Stamp HomeWork Board

' {$STAMP BS2}

' {$PBASIC 2.5}

' Requires remote XBee in loopback mode (DIN connected to DOUT)

Baud CON 84 ' 9600 baud non-inverted

Rx PIN 15 ' XBee DOUT

Tx PIN 14 ' XBee DIN

temp VAR Byte ' Temporary variable

PAUSE 500 ' 1/2 second pause to stabilize

DEBUG CLS, "Type a character: " ' Prompt for character

DEBUGIN temp ' Catch user response

SEROUT Tx, Baud, [temp] ' Send to transmitting XBee

SERIN Rx, Baud, [temp] ' Get echo from receiving XBee

SEROUT 16, Baud,

[CR, "You entered: " , temp] ' Display result

PAUSE 1500 ' Wait 1-1/2 seconds

LOOP

Note: When this program is run the BASIC Stamp Debug Terminal will automatically open.

Press a letter or number key. You will know things are working when each key you press is

echoed back to you. If you prefer, uncheck the Echo Off box at the bottom of the Debug

Terminal to prevent double characters from appearing.

Propeller QuickStart

' Requires remote XBee in loopback mode (DIN connected to DOUT)

OBJ

PC : "FullDuplexSerial"

XB : "FullDuplexSerial"

CON

_clkmode = xtal1 + pll16x

_xinfreq = 5_000_000

' Set pins and Baud rate for XBee communication

XB_Rx = 0 ' XBee DOUT Data coming in from XBee

XB_Tx = 1 ' XBee DIN Data going out of XBee

XB_Baud = 9600

' Set pins and baud rate for PC communication

PC_Rx = 31

PC_Tx = 30

PC_Baud = 115200

VAR

long stack[50] ' Stack space for second cog

Pub Go

PC.start(PC_Rx, PC_Tx, 0, PC_Baud) ' Initialize comms for PC

XB.start(XB_Rx, XB_Tx, 0, XB_Baud) ' Initialize comms for XBee

cognew(XB_to_PC,@stack) ' Start cog for XBee--> PC comms

PC.rxFlush ' Empty buffer for data from PC

repeat

XB.tx(PC.rx) ' Accept data from PC and send to XBee

Pub XB_to_PC

XB.rxFlush ' Empty buffer for data from XB

repeat

PC.tx(XB.rx) ' Accept data from XBee, send to PC

Note: This program uses the Parallax Serial Terminal object library, which is included with the

Propeller Tool software download.

Note: To view the results of the demonstration, after uploading is complete run the Parallax

Serial Terminal from the Run menu, or press F11, then click Enable. Momentarily depress the

Reset button on the Propeller QuickStart board to restart the program.

Note: Press a letter or number key. You will know things are working when each key you press

is echoed back as you type it. If you prefer, uncheck the Echo On box to prevent double

characters from appearing.

Arduino Uno

// Requires remote XBee in loopback mode (DIN connected to DOUT)

#include <SoftwareSerial.h>

#define Rx 6 // DOUT to pin 6

#define Tx 7 // DIN to pin 7

SoftwareSerial Xbee (Rx, Tx);

void setup() {

Serial.begin(9600); // Set to No line ending;

Xbee.begin(9600); // type a char, then hit enter

delay(500);

}

void loop() {

if(Serial.available()) { // Is serial data available?

char outgoing = Serial.read(); // Read character, send to XBee

Xbee.print(outgoing);

}

if(Xbee.available()) { // Is data available from XBee?

char incoming = Xbee.read(); // Read character,

Serial.println(incoming); // send to Serial Monitor

}

delay(50);

}

Note: To view the results of the demonstration, after uploading is complete click the Serial

Monitor icon in the Arduino IDE. This displays the Serial Monitor window. Momentarily

depress the Reset button on the Arduino board to restart the sketch.

Note: Press a letter or number key. You know things are working when the character is echoed

back as you type. You must press the Enter key after each character, or string of characters. Be

sure to choose the Carriage return and line feed option in the Serial Monitor window to enable

the Enter key action.

For More Information

•Refer to the XBee Wireless Pack (#32440) page for details regarding this product.

•See the XBee RF Modules page for more information on the various Parallax XBee products, a

cross reference chart, and links to documentation and how-to guides.

•View the XBee USB Adapter Board (#32400) documentation.

•View the XBee 5V/3.3V Adapter Board (#32401) documentation.

•Read the PDF Getting Started with XBee RF Modules text (#122-32450).

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