class3_autoCalibrate_photocell_andSpeaker_tones

/*
Analog input from photocell to determine LED brightness
 Matt Richard
 http://idblab.blogspot.com
 */
/*
Pitch follower
 Plays a pitch that changes based on a changing analog input
 circuit:
 * 8-ohm speaker on digital pin 11, speakerPin
 * photoresistor on analog 0 to 5V
 * 4.7K resistor on analog 0 to ground
 created 21 Jan 2010
 Modified 4 Sep 2010
 by Tom Igoe

 This example code is in the public domain.
 http://arduino.cc/en/Tutorial/Tone2
 */



int speakerPin = 11;
int sensorPin = A0; // select the input pin for the potentiometer
int ledPin = 11; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
int minThresh = 1000;// replace this number with a lowest number from the serial monitor
int maxThresh = 0;// replace this number with a highest number from the serial monitor

void setup() {
  Serial.begin(9600);

  // turn on pin 13 LED, to let us know we are in calibration mode
  digitalWrite(13, HIGH);

  // create a for loop
  for(int i = 0; i < 1000; i++){
    // that repeatedly checks the value of the photocell
    sensorValue = analogRead(sensorPin);
    // and determines if the value is less than the lowest ever value
    if(sensorValue < minThresh){
      minThresh = sensorValue;
      Serial.print("minThresh = ");
      Serial.println(minThresh);// minThresh = 213
    }
    // or greater than the highest ever value.
    if(sensorValue > maxThresh){
      maxThresh = sensorValue;
      Serial.print("maxThresh = ");
      Serial.println(maxThresh);// maxThresh = 613
    }
    delay(5);
  }
  // turn off pin 13 led to let us know we are done calibrating
  digitalWrite(13, LOW);


}

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);
  sensorValue = constrain(sensorValue, minThresh, maxThresh);
  Serial.println(sensorValue);

  int thisPitch = map(sensorValue, minThresh, maxThresh, 100, 1000);
  // play the pitch:
  tone(speakerPin, thisPitch, 10);

  //analogWrite(ledPin, map(sensorValue, minThresh, maxThresh, 0, 255));
}