/* 
 *Code for the blow sensor
 *Based on Knock and Calibrate from Arduino examples
 *by David Mellis,Tom Igoe and David Cuartielles
 *
 *
 *More info:
 *http://www.iua.upf.es/~jlozano/interfaces/blow_sensor.html
 *Jose Lozano
 *
 *
 */


// these constants won't change:
const int ledPin = 13;      // led connected to digital pin 13
const int piezo = 0;  // the piezo is connected to analog pin 0


// these variables will change:
int sensorReading = 0;      // variable to store the value read from the sensor pin
int sensorMax = 0;
int sensorMin = 1023;
int threshold;


void setup() {
  pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
  Serial.begin(57600);       // use the serial port
  pinMode(13, OUTPUT);
  digitalWrite(13, HIGH);
  while (millis() < 3000) {
    threshold = analogRead(piezo);

    // record the maximum sensor value
    if (threshold > sensorMax) {
      sensorMax = threshold;
    }
    if (threshold < sensorMin) {
      sensorMin = threshold;
    }

  }

  // signal the end of the calibration period
  digitalWrite(13, LOW);
  threshold = sensorMax;
  //  Serial.println("*");
  Serial.println(sensorMax);
  Serial.println(sensorMax);
  Serial.println(sensorMax);
  Serial.println(sensorMin);
  Serial.println(sensorMin);
  Serial.println(sensorMin);
  //  Serial.println("*");
}

void loop() {
  // read the sensor and store it in the variable sensorReading:
  sensorReading = analogRead(piezo);    

  // if the sensor reading is greater than the threshold:
  if ((sensorReading >= threshold) || (sensorReading <= sensorMin) ) {
    Serial.println(sensorReading);         


  }
  

  
  delay(3);  // Better for Processing showing data
}