Arduino - Photoresistor to Tune

photoresistor_to_tune.ino

#include "pitches.h"

int lightPin = 0;
int potPin = 1;
int valueToTriggerNote = 0;

int tunePin = 9;
int feedbackLedPin = 13;

int tune = 400;
int prevval = 0;

void setup() {
  pinMode(feedbackLedPin, OUTPUT);
}

void loop() {
  
  int lightVal = analogRead(lightPin);
  int lightDelta = prevval - lightVal;
  
  if (lightDelta > 80) {
    tune *= 1.25;
    if (tune > 1000) {
      tune = 400;
    }
    playTone(8, tune);
    delay(300);
  }
  prevval = lightVal;
  
  delay(100);
}

void playTone(int pin, int note) {
  
  digitalWrite(feedbackLedPin, HIGH);
  // play a note on pin 8 for 500 ms:
  tone(tunePin, note);
  delay(300);
  
  digitalWrite(feedbackLedPin, LOW);
   // turn off tone function for pin 7:
  noTone(tunePin);
}

schema.svg