when I start doing the project 14 I have faced a problem, after I have wrote my codes therewas an error in the processing program say as the Pic .
so what I should do ?
These codes should work without error.
Arduino Code:
void setup() {
 // put your setup code here, to run once:
 Serial.begin(9600);
}
void loop() {
 // put your main code here, to run repeatedly:
 Serial.println(analogRead(A0)/4);
 delay(100);
}
Processing code:
import processing.serial.*;
Serial myPort;
PImage logo;
int bgcolor = 0;
void setup(){
 colorMode(HSB, 255);
 logo = loadImage("https://www.arduino.cc/en/pub/skins/arduinoWide/img/logo.png");
 size(logo.width, logo.height);
 println("Avaliable serial ports:");
 println(Serial.list());
 myPort = new Serial(this, Serial.list()[0], 9600);
}
void draw(){
 if (myPort.available() > 0) {
  bgcolor = myPort.read();
  println(bgcolor);
 }
 background(bgcolor, bgcolor, 255);
 image(logo, 0, 0);
}
here :
size(logo.width, logo.height);
use numbers instead of variables, like the error says, like
size(200, 100);
I've just tried it yesterday. Besides the size that "RajoAlfa" mentioned above.
Please modify this line as well:
myPort = new Serial(this, Serial.list()[0], 9600);
to
myPort = new Serial(this, "COM3", 9600);
Note: COM3 is what my Arduino using.
It works for me!!
I am using OS X 10.11.1.
The code the book presented didn't work for me. This is a summary of the changes I made so that it worked.
Arduino code:
void setup() {
 // put your setup code here, to run once:
 Serial.begin(9600);
}
void loop() {
 // put your main code here, to run repeatedly:
 Serial.write(analogRead(A0)/4);
 delay(100);
}
Processing code:
import processing.serial.*;
Serial myPort;
PImage logo;
int bgcolor = 0;
void setup(){
 colorMode(HSB, 255);
 logo = loadImage("https://www.arduino.cc/en/pub/skins/arduinoWide/img/logo.png");
 size(400, 200);
 println("Avaliable serial ports:");
 println(Serial.list());
 myPort = new Serial(this, Serial.list()[1], 9600);
Â
}
void draw(){
 if (myPort.available() > 0) {
  bgcolor = myPort.read();
  println(bgcolor);
 }
 background(bgcolor, bgcolor, 255);
 image(logo, 0, 0);
}
In Arduino code:
- delay(1) to delay(100)
Processing code:
-
change image url
https://www.arduino.cc/en/pub/skins/arduinoWide/img/logo.png -
change size() to constants
size(400, 200); -
change myPort
myPort = new Serial(this, Serial.list()[1], 9600);