Description
Starting with the Arduino setup from the last lab, I removed the poteniometers and replaced them with just one Force Sensitive Resistor (FSR). This FSR was connected to both anolog input (A0) and ground (through a 10K resistor).
Addiitonally, I left one LED connected from the previous setup (through port 11 and a resistor, then the LED then to ground). This helped me debug since it would light up ever time the FSR received a force.
Using the application Processing and the script provided by Laura, I configured the sketch to accept serial input from my Arduino. The colors are randomized whenever the FSR is released and there is a "0" value from Serial.
I defined my own function to return the proper coordinates for a smiley face. This function picks either to draw an eye (right or left) at a certain spot, or it draws a point along a smile curve, defined by a customized parabolic function. The coordinates for center of the circle are returned. This function is called within the 'drawballs' function. 'drawballs' is called so frequently when the FSR is pressed, that it has the effect of drawing both the eyes and the smile, seemingly at the same time.
The overall effect is a frog-like face that gains color and definition as the user presses the FSR in a variety of ways. The interaction is quite intuitive; the user typically needs no instruction to enjoy making funny and sometimes creepy faces. :)
Here is a link to a video of how it works:
https://www.facebook.com/photo.php?v=10102479296905933&l=155193451012005...
CODE
/*
* Arduino Ball Paint
* (Arduino Ball, modified 2008)
* ----------------------
*
* Draw balls randomly on the screen, size controlled by a device
* on a serial port. Press space bar to clear screen, or any
* other key to generate fixed-size random balls.
*
* Receives an ASCII number over the serial port,
* terminated with a carriage return (ascii 13) then newline (10).
*
* This matches what Arduino's " Serial.println(val)" function
* puts out.
*
* Created 25 October 2006
* copyleft 2006 Tod E. Kurt <tod@todbot.com
* http://todbot.com/
*/
import processing.serial.*;
// Change this to the portname your Arduino board
Serial port;
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();
/*
Run the code once with this print statement to see a list of available serial ports.
Make a note of the number next to the port you'd like to use
*/
println(Serial.list());
/* Once you know the number of the port you want to use Replace the "0" in the code below
with the port number. For instance, if you wanted to use port number 4 in the list, then
the code should say: port = new Serial(this, Serial.list()[4], 9600);
*/
port = new Serial(this, "/dev/tty.usbmodem1411", 9600);
}
void draw() {
}
// Initialized the color of circles
int red = int(random(0,255));
int green = int(random(0,255));
int blue = int(random(0,255));
void keyPressed() {
if(key == ' ') {
background(40,40,40); // erase screen
}
}
//Function that plots the cicrles on predefined spots for eyes and the mouth
//returns the x and y coordinates for the drawballs function
int[] smiley(){
//define the range of x and y that defines a smiley face
//randomly pick and eye or the smile to draw
int which=int(random(0,3));
//initialize local versions of x and y as xx and yy
int xx = 0;
int yy = 0;
if (which ==0){//left eye
xx=width/3;
yy=height/3;
}
if (which ==1){//right eye
xx=(2*width)/3;
yy=height/3;
}
if (which ==2){//smile
// println("smile");
xx=int(random(width/3,(2*width)/3));
float q=-(0.002)*pow(float(xx)-(float(width)/2),2)+300;
// println(q);
yy=int(q);//((2*height)/3)
// println(yy);
}
int[] coordinates = {xx,yy};
return coordinates;
}
// draw balls
//modified from the original version:
// - added color variation being passed in
// - x and y are returned by the smiley function
void drawball(int r, int red, int green, int blue) {
for (int i=0; i<100; i++ ) {
fill(red,green,blue);
int[] smiley_coordinates=smiley();
int x=smiley_coordinates[0];
int y=smiley_coordinates[1];
ellipse(x,y,r,r);
}
}
// called whenever serial data arrives
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) {
buf += char(c);
//Change to a new random color when you stop pressing the FSR
if (int(buf) == 0) {
red = int(random(0,255));
green = int(random(0,255));
blue = int(random(0,255));
}
}
if (c == lf) {
int val = int(buf);
if (val!=0){
println("val="+val);
}
drawball(val, red, green, blue);
//
// println(x);
// println(y);
// println(val);
buf = "";
// background(40,40,40); // erase screen
}
}
_0.thumbnail.JPG "Arduino Configuration-FSR hypno-toad")
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