Post date: Jul 08, 2010 3:10:57 AM
The Arduino portion of this code is almost identical to the one in the example of the Punctuation method given, except I changed the names of the variables for funzies:
int potOne = 1; // set up variables
int potTwo = 2;
int potThree = 3;
int val = 0;
void setup() {
Serial.begin(9600); // begin serial communication at 9600 bps
}
void loop() {
val = analogRead(potOne); // read the potentiometer and store it in val
Serial.print(val, DEC); // print the value of val, and
Serial.print(","); // separate them with a comma
val = analogRead(potTwo);
Serial.print(val, DEC);
Serial.print(",");
val = analogRead(potThree);
Serial.println(val, DEC);
}
The Processing portion of the code required a couple new parts, though it is still very similar to the Punctuation method example:
import processing.serial.*; // import Processing library
Serial myPort; // set up variables
float redColor;
float greenColor;
float blueColor;
void setup() {
size (600, 600); // sets window size
background(0); // sets background color
myPort = new Serial(this, Serial.list()[0], 9600);
myPort.bufferUntil('\n'); // read bytes into a buffer until
} // you get a linefeed (ASCII 10)
void draw() {
// twiddle your thumbs
}
void serialEvent(Serial myPort) { // this method is run automatically when the buffer reaches the byte value set in the bufferUntil method
String myString = myPort.readStringUntil('\n'); // read the serial buffer
println(myString); // print the value of myString
if (myString != null); { // if myString is not null,
myString = trim(myString);
int sensors[] = int(split(myString, ',')); // split the string at the commas and convert the sections into integers
for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
print("Sensor " + sensorNum + "; " + sensors[sensorNum] + "\t"); // print the values of the new integers
}
if (sensors.length > 1) { // add a linefeed after all the sensor values are printed
redColor = map(sensors[0], 0, 1023, 0, 225); // sets and maps variables so that the values can
greenColor = map(sensors[1], 0, 1023, 0, 225); // be read as color values
blueColor = map(sensors[2], 0, 1023, 0, 225);
}
}
fill(redColor, greenColor, blueColor); // sets fill color according to new variables' values
ellipseMode(CENTER); // sets ellipse mode to center
ellipse(width/2, height/2, 500, 500); // draws ellipse
}
I tried to run this sketch without the serialEvent method, but that didn't work. So I added that method and things went splendidly from there. I guess there would be two ways to adjust the sensor values so that they can be read as color values. The first way is the way I did it, through the map function. The second would be through the colorMode function, by adjusting the color values to read 0 - 1023.
This sketch uses three potentiometers attached to analog pins 1, 2, and 3. I used such a big screen size because I like the look of the bigger circle, and I felt the smaller circles didn't show the color changes as well.