blue book examples

java/examples/Books/Processing Handbook/Extensions/Electronics/_03A/_03A.pde

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+// 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 = 0; // Set the pin to digital I/O 0
+
+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
+}