The inner workings of the RFID chair.

Lay back and relax, this post is gonna be a biggie.

Alright, the RFID chair, let me start explaining how and why. 

We used a office chair with a RFID scanner in the left armrest. If you put a tag in your left trouser pocket and lift your leg a little, you'll get scanned. For effect you'll first get a green beam over your face, just for scanning effect.

Here's the code, all the tags, except for mine, have been removed. For privacy reasons.

[code]

import org.onsignal.rfid.*;
import gnu.io.*; // for the exceptions
RFIDReader r;
String portName = "COM4";
RFIDTag tag;
String currentTag;
float offset;
PFont font;
int pos = 0;
int active = 0;
int showtag = 0;
PImage pieter, andre, arthur, douwe, herjan, ineke, irene, jan, jonas, martijn, martina, reinout, sarah, siewart, thomas, tom, bram, joost, unknown;

class TagListener implements RFIDListener
{
void tagAdded(RFIDTagEvent e) {
active = 1;
currentTag=("Tag " + e.getTag() + " was added to reader " + e.getReader());
tag = e.getTag();


}
void tagRemoved(RFIDTagEvent e) {
println("Tag " + e.getTag() + " was removed from reader " + e.getReader());
background(0);

}
}


void setup() {
size(2704,1050);
background(0);
pieter = loadImage("pieter.jpg");
andre = loadImage("Andre.jpg");
arthur = loadImage("Arthur.jpg");
douwe = loadImage("Douwe.jpg");
herjan = loadImage("Herjan.jpg");
ineke = loadImage("Ineke.jpg");
irene = loadImage("Irene.jpg");
jan = loadImage("Jan.jpg");
jonas = loadImage("Jonas.jpg");
martijn = loadImage("Martijn.jpg");
martina = loadImage("Martina.jpg");
reinout = loadImage("Reinout.jpg");
sarah = loadImage("Sarah.jpg");
siewart = loadImage("Siewart.jpg");
thomas = loadImage("Thomas.jpg");
tom = loadImage("Tom.jpg");
unknown = loadImage("unknown.jpg");
joost = loadImage("mudkipz.jpg");
bram = loadImage("riverside.jpg");
try {

r = new RFIDReader(portName, new TagListener());

} catch (NoSuchPortException e) {
println("Port "+portName+" was not found!");
} catch (PortInUseException e) {
println("Port "+portName+" is in use by another program.");
}

}

void draw() {
if (active == 1) {
showtag = 0;
background(0);
pos += 4;
fill(#5BFC00);
//line(1690, pos, 2700, pos);
rectMode(CORNERS);
rect(1690, pos, 2700, pos+10);
if (pos > 800) {
pos = 0;
active = 0;
showtag = 1;
}
}
if (showtag == 1) {
if(tag.equals("fc:62:4c:41")) image(pieter,0,0,1670,1050);
  else if(tag.equals("Tag removed")) image(jan,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(herjan,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(bram,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(irene,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(tom,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(martijn,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(thomas,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(jonas,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(siewart,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(reinout,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(sarah,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(ineke,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(arthur,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(andre,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(martina,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(joost,0,0,1670,1050);
else if(tag.equals("Tag removed")) image(douwe,0,0,1670,1050);
else image(unknown,0,0,1670,1050);

}  
}

[/code]

Let me explain the code: 

Once a cart is scanned, active is set to 1. If active is 1, showtag is 0 (so no image is shown) and it starts the beamer green line output. When it's finished with that it sets active to 0 and showtag to 1. If showtag is 1 it will compare the scanned tag to the known tags and displays the correct image with the registered tags. If the tag is unknown it wil display the unknown user image. 

So, there you have it, an RFID chair!