| /* |
| 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 9 Apr 2012 |
| by Tom Igoe |
| |
| 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 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(9, thisPitch, 10); |
| delay(1); // delay in between reads for stability |
| } |
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