Lab04
Description
Visualization
* Use the Arduino to read FSR input and visualized as circle wave.
Mechanical Construction
* Measure the force which writing on a card
Components Used
Resistor
FSR
Card
Processing part
/*
* Circle visualization of FSR
* ---------------
*
* Created 27 September 2011
* copyleft 2011 Fan, Wai Pio
*
* one pot dims, the other pot changes the blinking rate
* modification of the following
* Arduino Ball Paint
* 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
String portname = "/dev/tty.usbmodem411"; // or "COM5"
Serial port;
String buf="";
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
int width = 600;
int height = 600;
float[] radiuses = new float[10];
float[] dRadiuses = new float[10];
int oldVal = 0;
void setup() {
size(width,height);
frameRate(10);
smooth();
background(255,255,255);
noFill();
port = new Serial(this, portname, 9600);
}
void draw() {
}
void keyPressed() {
if(key == ' ') {
background(255,255,255); // erase screen
}
}
// draw circles
void drawCircle() {
for(int i=0; i<radiuses.length; i++) {
radiuses[i] += dRadiuses[i];
ellipse(width/2,height/2,radiuses[i],radiuses[i]);
if(radiuses[i] > width*1.2) {
radiuses[i] = 0;
dRadiuses[i] = 0;
}
}
}
// called whenever serial data arrives
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) {
buf += char(c);
}
if (c == lf) {
int val = int(buf);
//println("val="+val);
if(val>0) {//(val - oldVal) * (val - oldVal) > 400) {
oldVal = val;
int i=0;
for(; i < dRadiuses.length; i++)
if(dRadiuses[i] == 0) {
break;
}
if(i < radiuses.length)
dRadiuses[i] = val/1024.0*radiuses.length;
}
buf = "";
background(255,255,255); // erase screen
drawCircle();
}
}
Arduiro Part
/*
AnalogReadSerial
Reads an analog input on pin A0, prints the result to the serial monitor
This example code is in the public domain.
*/
void setup() {
Serial.begin(9600);
}
void loop() {
int sensorValue = analogRead(A0);
Serial.println(sensorValue, DEC);
}
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