Added ReadASCIIString example to Communication examples

Author: Tom Igoe

examples/04.Communication/ReadASCIIString/ReadASCIIString.ino

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+/*
+  Reading a serial ASCII-encoded string.
+ 
+ This sketch demonstrates the Serial parseInt() function.
+ It looks for an ASCII string of comma-separated values.
+ It parses them into ints, and uses those to fade an RGB LED.
+ 
+ Circuit: Common-anode RGB LED wired like so:
+ * Red cathode: digital pin 3
+ * Green cathode: digital pin 5
+ * blue cathode: digital pin 6
+ * anode: +5V
+ 
+ created 13 Apr 2012
+ by Tom Igoe
+ 
+ This example code is in the public domain.
+ */
+
+// pins for the LEDs:
+const int redPin = 3;
+const int greenPin = 5;
+const int bluePin = 6;
+
+void setup() {
+  // initialize serial:
+  Serial.begin(9600);
+  // make the pins outputs:
+  pinMode(redPin, OUTPUT); 
+  pinMode(greenPin, OUTPUT); 
+  pinMode(bluePin, OUTPUT); 
+
+}
+
+void loop() {
+  // if there's any serial available, read it:
+  while (Serial.available() > 0) {
+
+    // look for the next valid integer in the incoming serial stream:
+    int red = Serial.parseInt(); 
+    // do it again:
+    int green = Serial.parseInt(); 
+    // do it again:
+    int blue = Serial.parseInt(); 
+
+    // look for the newline. That's the end of your
+    // sentence:
+    if (Serial.read() == '\n') {
+      // constrain the values to 0 - 255 and invert
+      // if you're using a common-cathode LED, just use "constrain(color, 0, 255);"
+      red = 255 - constrain(red, 0, 255);
+      green = 255 - constrain(green, 0, 255);
+      blue = 255 - constrain(blue, 0, 255);
+
+      // fade the red, green, and blue legs of the LED: 
+      analogWrite(redPin, red);
+      analogWrite(greenPin, green);
+      analogWrite(bluePin, blue);
+
+      // print the three numbers in one string as hexadecimal:
+      Serial.print(red, HEX);
+      Serial.print(green, HEX);
+      Serial.println(blue, HEX);
+    }
+  }
+}
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