| /* | |
| Pitch follower | |
| Plays a pitch that changes based on a changing analog input | |
| circuit: | |
| - 8 ohm speaker on digital pin 9 | |
| - photoresistor on analog 0 to 5V | |
| - 4.7 kilohm 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. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/tonePitchFollower | |
| */ | |
| 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 | |
| } | |