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tonePitchFollower.ino
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/
tonePitchFollower.ino
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/*
Pitch follower
Plays a pitch that changes based on a changing analog input
circuit:
* 8-ohm speaker through 100 Ohm resistor on digital pin 3
* photoresistor on pin 5 to 3.3V
* 4.7K resistor on pin 5 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(5);
// 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(3, thisPitch, 10);
//delay(1); // delay in between reads for stability
}