Added tone example

build/shared/examples/Digital/tonePitchFollower/tonePitchFollower.pde

@@ -0,0 +1,43 @@
+/*
+  Pitch follower
+ 
+ Plays a pitch that changes based on a changing analog input
+ 
+ circuit:
+ * 8-ohm speaker on digital pin 8
+ * photoresistor on analog 0 to 5V
+ * 4.7K resistor on analog 0 to ground
+ 
+ created 21 Jan 2010
+ by Tom Igoe 
+ 
+ http://arduino.cc/en/Tutorial/Tone2
+ 
+ */
+
+
+void setup() {
+  // initialize serial communications (for debugging only):
+  Serial.begin(9600);
+}
+
+void loop() {
+  // read the sensor:
+  int sensorReading = analogRead(0);
+  // print the sensor reading so you know its range
+  Serial.println(sensorReading);
+  // map the pitch to the range of the analog input.
+  // change the minimum and maximum input numbers below
+  // depending on the range your sensor's giving:
+  int thisPitch = map(sensorReading, 400, 1000, 100, 1000);
+
+  // play the pitch:
+  tone(8, thisPitch, 10);
+
+}
+
+
+
+
+
+