+/*
+ 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
+ modified 31 May 2012
+ by Tom Igoe, with suggestion from Michael Flynn
+
+This example code is in the public domain.
+
+ 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(A0);
+ // print the sensor reading so you know its range
+ Serial.println(sensorReading);
+ // map the analog input range (in this case, 400 - 1000 from the photoresistor)
+ // to the output pitch range (120 - 1500Hz)
+ // change the minimum and maximum input numbers below
+ // depending on the range your sensor's giving:
+ int thisPitch = map(sensorReading, 400, 1000, 120, 1500);
+
+ // play the pitch:
+ tone(9, thisPitch, 10);
+ delay(1); // delay in between reads for stability
+}
+
+
+
+
+
+