/*
Michael Kontopoulos
2009

Sigh Collector - Sender Code
*/

#include <NewSoftSerial.h>
NewSoftSerial mySerial =  NewSoftSerial(4, 5); //instead of 1,2 (rx,tx)
//PINS
int stretcher = 1;   
int threshPin = 0;
int threshLed=3;
int val = 0;       // variable to store the value coming from the sensor
int pot = 0;
int sighPin = 13;


//VARIABLES
int const numVals = 40;
int breathVals[numVals];
//int diffVals[numVals/4];
int total=0, diffTotal=0, avg=0, rate=0;
int state = 0;
int threshold=0;
int normBreath;
int prevMillis=0;
boolean possibleSigh;

void setup() {

  Serial.begin(9600);
    mySerial.begin(9600);
  pinMode(sighPin, OUTPUT);
  pinMode(stretcher, INPUT);
  possibleSigh = false;
}

void loop() {
  
  serialHandler();
  
  val = analogRead(stretcher);
  threshold = analogRead(threshPin);
  // Serial.println(val);
  checkSigh(avg);

  //Array of the last 30 breath values
  for(int i=1; i<numVals; i++)
  {
    //Shift the values down
    breathVals[i-1] = breathVals[i]; 

    //Add the most recent value to the last element
    breathVals[numVals-1] = val;   

    //Obtaining the sliding scale average
    //First add up all the values in the array
    total += abs(breathVals[i-1]); 
    //Average them
    avg = total/numVals;
  }

  total=0;
  diffTotal=0;  



  //PRINT TESTS
  Serial.print("Average Value: ");
  Serial.print(avg);
  Serial.print("\tThreshold: ");
  Serial.println(threshold); 


  if((avg >= threshold) && (avg < 400))
  {
    // digitalWrite(threshLed, HIGH);
    possibleSigh = true;

  }  
  else {
    //digitalWrite(threshLed, LOW); 
  }

}
long int prevMillz = 0;
void checkSigh(int average)
{
  if(possibleSigh)
  {  prevMillis = millis();
    //when avg drops back down, register the sigh
    if(average <= 15) {

      mySerial.println(8, DEC);
      Serial.println("sigh detected. mobile unit");
      
      digitalWrite(sighPin, HIGH);      
      delay(1000);
      digitalWrite(sighPin, LOW);
      possibleSigh=false;
    }
  } 
  else
    possibleSigh=false;

}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void serialHandler()
{
  if (mySerial.available()) {
    Serial.print((char)mySerial.read());
  }
  if (Serial.available()) {
    mySerial.print((char)Serial.read());
  }

  delay(100);

}