///// THIS CODE GETS THE ANALOGE DATA IN CHECKS ITS PATTERN TO 

//DETECT A BEAT THEN SENDS IT OUT AS TAGGED BYTES TO A JAVA APp

#define mask 255   // kill top bits

int potPin = 0;    // select the input pin for the pot

int ledPin = 13;   // select the pin for the LED

int val = 16706;       // variable to store the value coming from the sensor

int val2 =0;

int a =0;

int b =0;

int beats[]= {0,0,0,0,0};// to track last five reads for a pattern

boolean beated = false;

//function dec

boolean getBioData();

void setup() {

  pinMode(ledPin, OUTPUT);  // declare the ledPin as an OUTPUT

  Serial.begin(9600);

}

void loop() {

  char check=' ';

  val = analogRead(potPin);    // read the value from the sensor

  if (Serial.read() =='a'){ // check buffer for an 'a'

    val2 = val; 

    b= val & mask; 

    a =((val2>>8) & mask); //just in case mask

    delay(20);

    // Serial.print("b"); // debug

    // Serial.print(b);

    Serial.print(a,BYTE);

    Serial.print(b,BYTE);

    if (getBioData()){ // call bio function

          Serial.print('b',BYTE);  

    }

    else  Serial.print('n',BYTE); 

  }

}

boolean getBioData(){

  int beatVal = analogRead(potPin);    // read the value from the sensor

  beats[4] = beatVal; // put in back of array

  int beatDif = beats[5 - 1] - beats[0];

  for (int i = 0; i < 5;i++){

    beats[i] = beats[i+1]; // push zero out front

  }

  // check for beat

  if ( beatDif > 10 && (beated != true)){ 

    beated = true;

    return true;

  }

  else if( beatDif < 2 ){

    beated = false;

    return false;

  }

  else return false;

}