Lab 4: Stress Ball

Submitted by shaohan on Tue, 02/26/2013 - 23:13

Description:

I stuck the photocell sensor into a stress ball and modified the processing code to make the squeezing power of the hand visualized. In order to improve the accuracy, I set the default value of the received power not zero but a minus number (after several tries) that it can offset the squeezing power from the stress ball itself. 
 

Components:

1 - Arduino Uno
1 - Photocell Sensor
1 - LED Light (Red)
1 - Breadboard
1 - 220 ohm resistor 
1 - 10k ohm resistor
1 - Stress Ball
 

Codes:

 

/* Processing Codes
 */
 
import processing.serial.*;
String portname = "/dev/tty.usbmodem1421"; 
Serial port;
 
int time = 0;
 
void setup() {
  size(800,400);
  frameRate(100);
  background(#000000);
  smooth();
  noStroke();
  port = new Serial(this, portname, 9600); 
}
 
void draw() {
}
 
void serialEvent (Serial p) {
  // read the string from serial port, one line each time
  String serial_string = port.readStringUntil('\n'); 
  
if(serial_string != null) {
  float anger_level = float(serial_string) - 80;
  anger_level = map(anger_level*7, 0, 1023, 0, 350);
  
// draw red lines:
  stroke(300,0,0);
  line(time, height, time, height - anger_level);
  
  
// if ran out of the space, then return to the beginning and erase screen
// otherwise, increase the time (horizontal) value
 
  if (time >= width) {
   time = 0;
   background(#000000); 
  }
  else {
   time ++; 
  }
}
 
}  

 

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