more example moving

java/examples/Books/Processing Handbook/Extensions/Electronics/Ex_01B/Ex_01B.pde

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+// Read data from the serial port and change the color of a rectangle
+// when a switch connected to the board is pressed and released
+import processing.serial.*;
+Serial port; // Create object from Serial class
+int val; // Data received from the serial port
+
+void setup() {
+  size(200, 200);
+  frameRate(10);
+// Open the port that the board is connected to and use the same speed (9600 bps)
+  port = new Serial(this, 9600);
+}
+
+void draw() {
+  if (0 < port.available()) { // If data is available,
+    val = port.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);
+}