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    <p>I haven't used Java RXTX, but I've played with Arduino and Processing and it's pretty easy to read/write values from Arduino. Here is a read sample that comes with Processing(File > Examples > Libraries > Serial > SimpleRead)</p> <pre><code>/** * Simple Read * * Read data from the serial port and change the color of a rectangle * when a switch connected to a Wiring or Arduino board is pressed and released. * This example works with the Wiring / Arduino program that follows below. */ import processing.serial.*; Serial myPort; // Create object from Serial class int val; // Data received from the serial port void setup() { size(200, 200); // I know that the first port in the serial list on my mac // is always my FTDI adaptor, so I open Serial.list()[0]. // On Windows machines, this generally opens COM1. // Open whatever port is the one you're using. String portName = Serial.list()[0]; myPort = new Serial(this, portName, 9600); } void draw() { if ( myPort.available() &gt; 0) { // If data is available, val = myPort.read(); // read it and store it in val } background(255); // Set background to white if (val == 0) { // If the serial value is 0, fill(0); // set fill to black } else { // If the serial value is not 0, fill(204); // set fill to light gray } rect(50, 50, 100, 100); } /* // Wiring / Arduino Code // Code for sensing a switch status and writing the value to the serial port. int switchPin = 4; // Switch connected to pin 4 void setup() { pinMode(switchPin, INPUT); // Set pin 0 as an input Serial.begin(9600); // Start serial communication at 9600 bps } void loop() { if (digitalRead(switchPin) == HIGH) { // If switch is ON, Serial.print(1, BYTE); // send 1 to Processing } else { // If the switch is not ON, Serial.print(0, BYTE); // send 0 to Processing } delay(100); // Wait 100 milliseconds } */ </code></pre> <p>As far as I remember, the baud thingy you setup in Arduino when you instantiate Serial is pretty important. If you use 9600 to send for example, you should use the same number to listen.</p> <p>Also it's pretty important to send your information as <strong>BYTE</strong>, otherwise you'll have stuff like \r or \n in the way.</p> <p>Shorter version, try:</p> <pre><code>Serial.println(123456789123456789,BYTE); </code></pre> <p>The simpler the better. </p>
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    1. POSerial Communication between Java RXTX and Arduino
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    1. USGeorge Profenza
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    1. COHi , can processing work without Papplet? Because I try to integrate with my java code ...
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    2. CO@wizztjh you could try this: http://www.arduino.cc/playground/Interfacing/Java
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    3. COThanks for the reply , @geory let say I wanna get a analog input from arduino and the arduino will reply the analog value whenever I send some thing to arduino. According to the code in the link , It will just print out the thing instead of save it in a variable , How can i Store the chunck to a variable? Because the public synchronized void serialEvent can't return value , i think ...
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