Making Things Talk

IDENTIFICATION 311

Vdd

LED

Format

GND

TX

RES

ID Innovations

ID12 reader

Vusb

V3.3

CBUS1

CBUS0

CBUS3

CBUS2

CBUS4

VCCIO

TX

RX

DTR

RTS

RI

DSR

DCD

CTS

FTDI

USB-to-Serial Adaptor

GND

RX

TX

V3.3

Figure 9-7

The ID Innovations ID12 RFID

reader attached to an FTDI USB-

to-serial adaptor. The ID12 has

pins spaced 2mm apart, so you’ll

need to solder wires onto them to

fit them on a breadboard. You can

also use the 2mm female sockets

used with the XBee modules, or

you can use SparkFun’s breakout

board.

Making_Things_Talk.indb 311 11/13/09 4:56 PM

312 MAKING THINGS TALK

The sketch shown here

is a modification of the

Parallax sketch, with a new method,

parseString(). It reads the entire string,

confirms that the start and end bytes

are there, and strips out all but the

ten-byte tag ID. The changes to the

previous sketch are shown in blue:

/*

ID Innovations RFID Reader

language: Processing

*/

// import the serial library:

import processing.serial.*;

Serial myPort; // the serial port you're using

String tagID = ""; // the string for the tag ID

void setup() {

size(600,200);

// list all the serial ports:

println(Serial.list());

// based on the list of serial ports printed from the

// previous command, change the 0 to your port's number:

String portnum = Serial.list()[

0];

// initialize the serial port:

myPort = new Seri