Sensing Part 2:blinking rectangle

After exploring two new analog sensors, namely photocells and Force Sensitive Resistors ("FSR"), I used them in combination with processing. It generate GUI object which can be controlled by input through sensors. 
 
For homework, I used a FSR and created rectangle objects which blinks based on input through the FSR. To distribute force which the FSR detects, I sandwiched the FSR by two sponges. I think this structure can be used to detect pressure on everyday things such as coasters and entrance mat. 
Components used:
1- Arduino Uno
1- Breadboard
1- 220ohms resistor
1- 10Kohms resistor
1- LED lights (blue)
14- Connecting wires
Processing
 
Arduino code:

int potPin = 0;   // select the input pin for the potentiometer

int ledPin = 9;   // select the pin for the LED

int val = 0;      // variable to store the value coming from the sensor

void setup() {

  Serial.begin(9600);

}

void loop() {

  val = analogRead(potPin);    // read the value from the sensor, between 0 - 1024

  Serial.println(val);

  analogWrite(ledPin, val/4); // analogWrite can be between 0-255

}
 

Processing code:

import processing.serial.*;

String portname = "/dev/tty.usbmodem1421"; 

Serial port;

int fsr = 0;

String buf="";

int cr = 13;  // ASCII return   == 13

int lf = 10;  // ASCII linefeed == 10

void setup() {

  size(500,500);

  frameRate(10);

  smooth();

  background(40,40,40);

  noStroke();

  port = new Serial(this, portname, 9600); 

}

void draw() {

  background(40);

}

void keyPressed() {

  if(key == ' ') {

    background(40,40,40);  // erase screen

  }

  else {

    int x = int(random(0,width));

    int y = int(random(0,height));

    drawrect(x,y, 50);

  }

}

// draw rect

void drawrect(int x, int y, int r) {

    fill(100, 100, 255 );

    rect(x,y,r,r);

}

// called whenever serial data arrives

void serialEvent(Serial p) {

  int c = port.read();

  if (c>15){

    fsr = c;

  }

//  if (c != lf && c != cr) {

//    buf += char(c);

//  }

  if (c == lf) {

    //int val = int(buf)/100000;

    //println("val="+val); 

    int x = int(random(0,width));

    int y = int(random(0,height));

    drawrect(x,y,fsr);

//    buf = "";

//    background(40,40,40);  // erase screen

  }

}