The goal of this script is to have a user trace a pre-generated sine wave with a potentiometer. I would then like to save a file with a three-column matrix (or a .csv or .txt file) that includes the following information for each data point:
Time (milliseconds)
'senseval' (the value of the sensor coming from the potentiometer through serial communication)
Actual sine wave value (the value of the yellow ball)
Question: How do I continuously store the three values I mentioned above and then save a file with all the data when the program is stopped.
I am aware of PrintWriter, output.print, println, output.flush, and output.close but I'm having trouble figuring out where to place all these commands to get this to work. Any advice appreciated! Thanks.
/**
*
* Tracing a sine wave with a potentiometer
*
**/
// For sensor:
import processing.serial.*;
Serial myPort; // The serial port
float senseval;
// End For sensor
// For rendering sine wave:
int xspacing = 1; // How far apart should each horizontal location be spaced
int w; // Width of entire wave
float theta = 0.0; // Start angle at 0
float amplitude; // Height of wave
float period = 600; // How many pixels before the wave repeats
float dx; // Value for incrementing X, a function of period and xspacing
float[] yvalues; // Using an array to store height values for the wave
// End For rendering sine wave
void setup() {
// For rendering sine wave:
size(600, 600);
amplitude = height/3; //amplitude of wave is always 1/3 of window height
w = width;
dx = (TWO_PI / period) * xspacing;
yvalues = new float[w/xspacing];
// End For rendering sine wave
// For sensor:
println(Serial.list());
myPort = new Serial(this, Serial.list()[0], 9600);
myPort.bufferUntil('\n');
size(600, 600);
smooth();
stroke(0);
// End For sensor
}
void draw() {
background(0);
calcWave();
renderWave();
renderBall();
renderSensor();
}
void calcWave() {
// Increment theta (try different values for 'angular velocity' here
theta += 0.02;
// For every x value, calculate a y value with sine function
float x = theta;
for (int i = 0; i < yvalues.length; i++) {
yvalues[i] = sin(x)*amplitude;
x+=dx;
}
}
void renderWave() {
noStroke();
fill(100);
// Draw the wave by putting an ellipse at each location
for (int x = 0; x < yvalues.length; x++) {
ellipse(x*xspacing, height/2+yvalues[x], 16, 16);
}
}
void renderBall() { // Renders a yellow ball in the center of the screen
noStroke();
fill(255,255,0,255); // Yellow color, full opacity
