java/examples/Library/Serial/SimpleWrite/SimpleWrite.pde

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+/**
+ * Simple Write. 
+ * 
+ * Check if the mouse is over a rectangle and writes the status to the serial port. 
+ * 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() {
+  background(255);
+  if (mouseOverRect() == true) {  // If mouse is over square,
+    fill(204);                    // change color and
+    myPort.write('H');              // send an H to indicate mouse is over square
+  } 
+  else {                        // If mouse is not over square,
+    fill(0);                      // change color and
+    myPort.write('L');              // send an L otherwise
+  }
+  rect(50, 50, 100, 100);         // Draw a square
+}
+
+boolean mouseOverRect() { // Test if mouse is over square
+  return ((mouseX >= 50) && (mouseX <= 150) && (mouseY >= 50) && (mouseY <= 150));
+}
+
+
+/*
+  // Wiring/Arduino code:
+ // Read data from the serial and turn ON or OFF a light depending on the value
+ 
+ char val; // Data received from the serial port
+ int ledPin = 4; // Set the pin to digital I/O 4
+ 
+ void setup() {
+ pinMode(ledPin, OUTPUT); // Set pin as OUTPUT
+ Serial.begin(9600); // Start serial communication at 9600 bps
+ }
+ 
+ void loop() {
+ if (Serial.available()) { // If data is available to read,
+ val = Serial.read(); // read it and store it in val
+ }
+ if (val == 'H') { // If H was received
+ digitalWrite(ledPin, HIGH); // turn the LED on
+ } else {
+ digitalWrite(ledPin, LOW); // Otherwise turn it OFF
+ }
+ delay(100); // Wait 100 milliseconds for next reading
+ }
+ 
+ */