// Code from: https://github.com/sahaanurag256-cmyk/My-Asic-Journey/blob/main/arduino/code/Frequency_knob.ino
// Changes:
//   - text formatted
//   - made circuit


/*Light & Potentiometer indicating frequency of sound player
  Creator: Anurag Saha
*/

// defining the fixed pins

int light = A0;
int rotator = A1;
int speaker = 5;

int green = 2;
int yellow = 3;
int red = 4;

void setup()
{ 
  pinMode(speaker, OUTPUT);  // output sources
  pinMode(green, OUTPUT);    // output sources
  pinMode(yellow, OUTPUT);   // output sources
  pinMode(red, OUTPUT);      // output sources

  Serial.begin(115200);
}

void loop()
{ 
  int lval = analogRead(light);
  int rval = analogRead(rotator);

  int lpitch = map(lval, 200, 800, 0, 2000); // sets the maximum pitch, made limits 200 to 800 to increase light sensetivity
  int rpitch = map(rval, 0, 1023, 0, 2000);  // plots it out in scale of 0hz to 2khz

  int pitch = lpitch + rpitch + 50;    // combination of pitches produced by light & potentiometer. 50hz is he base sound so something is always heard

  pitch = constrain(pitch, 50, 4050);  // keeps the sound in safe limit of 50hz to 4050 hz to avoid buzzer glitches at absurd frequencies
  tone(speaker, pitch, 20);            // makes sound for 20ms before checking sensors again

  // led conditions

  digitalWrite(red, pitch > 3050);     // led indicating range of frequency
  digitalWrite(yellow, pitch > 1550);  // led indicating range of frequency
  digitalWrite(green, pitch > 550);    // led indicating range of frequency

  // code to plot these values of frequency on a computer

  Serial.print(50);
  Serial.print(" ");
  Serial.print(pitch);
  Serial.print(" ");
  Serial.println(rpitch);

  delay(10);
}