Theremin

theremin.c

int sensorValue;
int sensorLow = 1023;
int sensorHigh = 0;

const int ledPin = 13;

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);
  
  while(millis() < 5000) {
    sensorValue = analogRead(A0);
    
    if (sensorValue > sensorHigh) {
      sensorHigh = sensorValue;
    }
    
    if (sensorValue < sensorLow) {
      sensorLow  = sensorValue;
    }
  }
  
  digitalWrite(ledPin, LOW);
}

void loop() {
 sensorValue = analogRead(A0);
 
 int pitch = map(sensorValue, sensorLow, sensorHigh, 50, 4000);
 
 tone(8,pitch,20);
 
 delay(10);
}