The I C Bus - Exploring Arduino: Tools and Techniques for Engineering Wizardry - page 178

Copy the code from Listing 8-3 into your Processing sketch and adjust the
serial port name to the right value for your computer and the name of the font
you created. Then, ensure your Arduino is connected and click the Run icon
to watch the magic!
Listing 8-3: Processing Sketch for Displaying Temperature Values—display_temp.pde
//Displays the temperature recorded by an I2C temp sensor
import processing.serial.*;
Serial port;
String temp_c = "";
String temp_f = "";
String data = "";
int index = 0;
PFont font;
void setup()
{
size(400,400);
//Change "COM9" to the name of the serial port on your computer
port = new Serial(this, "COM9", 9600);
port.bufferUntil('.');
//Change the font name to reflect the name of the font you created
font = loadFont("AgencyFB-Bold-200.vlw");
textFont(font, 200);
}
void draw()
{
background(0,0,0);
fill(46, 209, 2);
text(temp_c, 70, 175);
fill(0, 102, 153);
text(temp_f, 70, 370);
}
void serialEvent (Serial port)
{
data = port.readStringUntil('.');
data = data.substring(0, data.length() - 1);
//Look for the comma between Celcius and Farenheit
index = data.indexOf(",");
//Fetch the C Temp
temp_c = data.substring(0, index);
//Fetch the F temp
temp_f = data.substring(index+1, data.length());
}