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48 lines
1.0 KiB
C++
48 lines
1.0 KiB
C++
/*
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Pitch follower
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Plays a pitch that changes based on a changing analog input
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circuit:
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* 8-ohm speaker on digital pin 8
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* photoresistor on analog 0 to 5V
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* 4.7K resistor on analog 0 to ground
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created 21 Jan 2010
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modified 31 May 2012
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by Tom Igoe, with suggestion from Michael Flynn
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This example code is in the public domain.
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http://arduino.cc/en/Tutorial/Tone2
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*/
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void setup() {
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// initialize serial communications (for debugging only):
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Serial.begin(9600);
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}
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void loop() {
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// read the sensor:
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int sensorReading = analogRead(A0);
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// print the sensor reading so you know its range
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Serial.println(sensorReading);
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// map the analog input range (in this case, 400 - 1000 from the photoresistor)
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// to the output pitch range (120 - 1500Hz)
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// change the minimum and maximum input numbers below
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// depending on the range your sensor's giving:
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int thisPitch = map(sensorReading, 400, 1000, 120, 1500);
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// play the pitch:
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tone(9, thisPitch, 10);
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delay(1); // delay in between reads for stability
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}
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