This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.



// Example by Tom Igoe

import processing.serial.*;

// The serial port:
Serial myPort;

void setup() {
  // List all the available serial ports:
  // Open the port you are using at the rate you want:
  myPort = new Serial(this, Serial.list()[0], 9600);

void draw() {
  while (myPort.available() > 0) {
    int inByte =;

Description Returns the number of bytes available.
Updated on October 3, 2015 05:36:17am UTC

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