Processing Code "Error, disabling_serialEvent() in Arduino - macos

Question

I receive this error when trying to run my arduino and Processing
Error, disabling serialEvent() for /dev/cu.usbmodem1451 null
I am running process 2 and Arduino 1.6.5 on a MAC OSX 10.9.5
I am super new to processing and arduino . I am just trying to use three potentiometers to control the RGB values of the background color.
Arduino code:
int potPin = 0;
//int potPinB = 1;
//int potPinC = 2;
void setup()
{
Serial.begin(9600);
}
void loop()
{
int val = map(analogRead(potPin), 0, 1023, 0, 255);
Serial.println(val);
delay(500);
//int valB = map(analogRead(potPinB), 0, 1023, 0, 255);
//Serial.println(valB);
//delay(50);
//int valC = map(analogRead(potPinA), 0, 1023, 0, 255);
//Serial.println(valC);
//delay(50);
}
Processing code:
import processing.serial.*;
Serial port;
float val = 0;
//float valB = 1; // another analog input
//float valC = 2; // another analog input
void setup()
{
size(500, 500);
port = new Serial(this, "/dev/cu.usbmodem1451", 9600);
port.bufferUntil('\n');
if (frame != null);
frame.setResizable(true);
}
void draw ()
{
background(val,255,150);
}
void serialEvent (Serial port)
{
val = float(port.readStringUntil('\n'));
}

Answer 1

You might be getting an error in serialEvent which you should be handling (perhaps the float conversion). Also, if you're using bufferUntil(), you shouldn't need readStringUntil().
Try something like this:
import processing.serial.*;
Serial port;
float val = 0;
//float valB = 1; // another analog input
//float valC = 2; // another analog input
void setup()
{
size(500, 500);
port = new Serial(this, "/dev/cu.usbmodem1451", 9600);
port.bufferUntil('\n');
if (frame != null);
frame.setResizable(true);
}
void draw ()
{
background(val,255,150);
}
void serialEvent (Serial port)
{
try{
val = float(port.readString());
}catch(Exception e){
e.printStackTrace();
}
}
When simply reading a single value, readChar() or simply read() should work.
If the above works. You should be able to send multiple values.
Initially you can send a csv like formatter line:
arduinoR,arduinoG,arduinoB\n
which you can then read as a string, split() it into an array of 3 values, then convert each array element from String to int.
Update
Here an example:
import processing.serial.*;
int r, g, b;
void setup() {
try {
new Serial(this, "/dev/tty.usbmodemfa141", 9600).bufferUntil('\n');
}
catch(Exception e) {
println("check settings above and usb cable, something went wrong:");
e.printStackTrace();
}
}
void draw() {
background(r, g, b);
}
void serialEvent(Serial s) {
String data = s.readString();
try {
String[] rgb = data.trim().split(",");
print(rgb);
if(rgb.length == 3){
r = int(rgb[0]);
g = int(rgb[1]);
b = int(rgb[2]);
}
}
catch(Exception e) {
e.printStackTrace();
}
}
Later on you can look at sending data as binary: exactly 3 bytes (r,g,b).
Have fun :)