/* Pitch followerPlays a pitch that changes based on a changing analog inputcircuit: * 8-ohm speaker on digital pin 9 * photoresistor on analog 0 to 5V * 4.7K resistor on analog 0 to groundcreated 21 Jan 2010 modified 31 May 2012 by Tom Igoe, with suggestion from Michael Flynn modified 7 Feb 2014 by Mark Easley This example code is in the public domain. */ 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 }