osx - Processing Code "Error, disabling_serialEvent() in Aurdino -

i receive error when trying run arduino , processing

error, disabling serialevent() /dev/cu.usbmodem1451 null 

i running process 2 , arduino 1.6.5 on mac osx 10.9.5

i super new processing , arduino . trying use 3 potentiometers control rgb values of 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; // analog input //float valc = 2; // 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')); } 

you might getting error in serialevent should handling (perhaps float conversion). also, if you're using bufferuntil(), shouldn't need readstringuntil().

try this:

import processing.serial.*;  serial port;  float val = 0; //float valb = 1; // analog input //float valc = 2; // 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 reading single value, readchar() or read() should work.

if above works. should able send multiple values. can send csv formatter line:

arduinor,arduinog,arduinob\n 

which can read string, split() array of 3 values, convert each array element string int. update here 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 , usb cable, 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 can @ sending data binary: 3 bytes (r,g,b). have fun :)