Unable to send the value from Arduino to Processing

[s10163741]

#define PROCESSING_VISUALIZER 1
#define SERIAL_PLOTTER 2

// Variables
int pulsePin = 0; // Pulse Sensor purple wire connected to analog pin 0
int blinkPin = 13; // pin to blink led at each beat
int fadePin = 5; // pin to do fancy classy fading blink at each beat
int fadeRate = 0; // used to fade LED on with PWM on fadePin

// Volatile Variables, used in the interrupt service routine!
volatile int BPM; // int that holds raw Analog in 0. updated every 2mS
volatile int Signal; // holds the incoming raw data
volatile int IBI = 600; // int that holds the time interval between beats! Must be seeded!
volatile boolean Pulse = false; // "True" when User's live heartbeat is detected. "False" when not a "live beat".
volatile boolean QS = false; // becomes true when Arduoino finds a beat.

// SET THE SERIAL OUTPUT TYPE TO YOUR NEEDS
// PROCESSING_VISUALIZER works with Pulse Sensor Processing Visualizer
// https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer
// SERIAL_PLOTTER outputs sensor data for viewing with the Arduino Serial Plotter
// run the Serial Plotter at 115200 baud: Tools/Serial Plotter or Command+L
//static int outputType = SERIAL_PLOTTER;
static int outputType = PROCESSING_VISUALIZER;
void setup(){
pinMode(blinkPin,OUTPUT); // pin that will blink to your heartbeat!
pinMode(fadePin,OUTPUT); // pin that will fade to your heartbeat!
Serial.begin(115200); // we agree to talk fast!
interruptSetup(); // sets up to read Pulse Sensor signal every 2mS
// IF YOU ARE POWERING The Pulse Sensor AT VOLTAGE LESS THAN THE BOARD VOLTAGE,
// UN-COMMENT THE NEXT LINE AND APPLY THAT VOLTAGE TO THE A-REF PIN
//analogReference(EXTERNAL);
}

// Where the Magic Happens
void loop(){

serialOutput() ;
if (QS == true){ // A Heartbeat Was Found
// BPM and IBI have been Determined
// Quantified Self "QS" true when arduino finds a heartbeat
fadeRate = 255; // Makes the LED Fade Effect Happen
// Set 'fadeRate' Variable to 255 to fade LED with pulse
serialOutputWhenBeatHappens(); // A Beat Happened, Output that to serial.
QS = false; // reset the Quantified Self flag for next time
}

ledFadeToBeat(); // Makes the LED Fade Effect Happen
delay(20); // take a break
}

void ledFadeToBeat(){
fadeRate -= 15; // set LED fade value
fadeRate = constrain(fadeRate,0,255); // keep LED fade value from going into negative numbers!
analogWrite(fadePin,fadeRate); // fade LED
}

---

//////////
///////// All Serial Handling Code,
///////// It's Changeable with the 'outputType' variable
///////// It's declared at start of code.
/////////

void serialOutput(){ // Decide How To Output Serial.
switch(outputType){
case PROCESSING_VISUALIZER:
sendDataToSerial('S', Signal); // goes to sendDataToSerial function
break;
case SERIAL_PLOTTER: // open the Arduino Serial Plotter to visualize these data
// Serial.print(BPM);
// Serial.print(",");
// Serial.print(IBI);
// Serial.print(",");
Serial.println(Signal);
break;
default:
break;
}

}

// Decides How To OutPut BPM and IBI Data
void serialOutputWhenBeatHappens(){
switch(outputType){
case PROCESSING_VISUALIZER: // find it here https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer
sendDataToSerial('B', BPM); // send heart rate with a 'B' prefix
sendDataToSerial('Q',IBI); // send time between beats with a 'Q' prefix
break;

default:
  break;

}
}

// Sends Data to Pulse Sensor Processing App, Native Mac App, or Third-party Serial Readers.
void sendDataToSerial(char symbol, int data ){
Serial.print(symbol);
Serial.println(data);
}

---

volatile int rate[10]; // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0; // used to determine pulse timing
volatile unsigned long lastBeatTime = 0; // used to find IBI
volatile int P =512; // used to find peak in pulse wave, seeded
volatile int T = 512; // used to find trough in pulse wave, seeded
volatile int thresh = 530; // used to find instant moment of heart beat, seeded
volatile int amp = 0; // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true; // used to seed rate array so we startup with reasonable BPM
volatile boolean secondBeat = false; // used to seed rate array so we startup with reasonable BPM

void interruptSetup(){ // CHECK OUT THE Timer_Interrupt_Notes TAB FOR MORE ON INTERRUPTS
// Initializes Timer2 to throw an interrupt every 2mS.
TCCR2A = 0x02; // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE
TCCR2B = 0x06; // DON'T FORCE COMPARE, 256 PRESCALER
OCR2A = 0X7C; // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE
TIMSK2 = 0x02; // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A
sei(); // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
}

// THIS IS THE TIMER 2 INTERRUPT SERVICE ROUTINE.
// Timer 2 makes sure that we take a reading every 2 miliseconds
ISR(TIMER2_COMPA_vect){ // triggered when Timer2 counts to 124
cli(); // disable interrupts while we do this
Signal = analogRead(pulsePin); // read the Pulse Sensor
sampleCounter += 2; // keep track of the time in mS with this variable
int N = sampleCounter - lastBeatTime; // monitor the time since the last beat to avoid noise

//  find the peak and trough of the pulse wave

if(Signal < thresh && N > (IBI/5)*3){ // avoid dichrotic noise by waiting 3/5 of last IBI
if (Signal < T){ // T is the trough
T = Signal; // keep track of lowest point in pulse wave
}
}

if(Signal > thresh && Signal > P){ // thresh condition helps avoid noise
P = Signal; // P is the peak
} // keep track of highest point in pulse wave

// NOW IT'S TIME TO LOOK FOR THE HEART BEAT
// signal surges up in value every time there is a pulse
if (N > 250){ // avoid high frequency noise
if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) ){
Pulse = true; // set the Pulse flag when we think there is a pulse
digitalWrite(blinkPin,HIGH); // turn on pin 13 LED
IBI = sampleCounter - lastBeatTime; // measure time between beats in mS
lastBeatTime = sampleCounter; // keep track of time for next pulse

  if(secondBeat){                        // if this is the second beat, if secondBeat == TRUE
    secondBeat = false;                  // clear secondBeat flag
    for(int i=0; i<=9; i++){             // seed the running total to get a realisitic BPM at startup
      rate[i] = IBI;
    }
  }

  if(firstBeat){                         // if it's the first time we found a beat, if firstBeat == TRUE
    firstBeat = false;                   // clear firstBeat flag
    secondBeat = true;                   // set the second beat flag
    sei();                               // enable interrupts again
    return;                              // IBI value is unreliable so discard it
  }


  // keep a running total of the last 10 IBI values
  word runningTotal = 0;                  // clear the runningTotal variable

  for(int i=0; i<=8; i++){                // shift data in the rate array
    rate[i] = rate[i+1];                  // and drop the oldest IBI value
    runningTotal += rate[i];              // add up the 9 oldest IBI values
  }

  rate[9] = IBI;                          // add the latest IBI to the rate array
  runningTotal += rate[9];                // add the latest IBI to runningTotal
  runningTotal /= 10;                     // average the last 10 IBI values
  BPM = 60000/runningTotal;               // how many beats can fit into a minute? that's BPM!
  QS = true;                              // set Quantified Self flag
  // QS FLAG IS NOT CLEARED INSIDE THIS ISR
}

}

if (Signal < thresh && Pulse == true){ // when the values are going down, the beat is over
digitalWrite(blinkPin,LOW); // turn off pin 13 LED
Pulse = false; // reset the Pulse flag so we can do it again
amp = P - T; // get amplitude of the pulse wave
thresh = amp/2 + T; // set thresh at 50% of the amplitude
P = thresh; // reset these for next time
T = thresh;
}

if (N > 2500){ // if 2.5 seconds go by without a beat
thresh = 530; // set thresh default
P = 512; // set P default
T = 512; // set T default
lastBeatTime = sampleCounter; // bring the lastBeatTime up to date
firstBeat = true; // set these to avoid noise
secondBeat = false; // when we get the heartbeat back
}

sei(); // enable interrupts when youre done!
}// end isr

---

This is the image use with the command "static int outputType = SERIAL_PLOTTER;". It seems fine but when used with "static int outputType = PROCESSING_VISUALIZER;" onto the Visualizer. I don't get a response. Here's the image:

[biomurph]

The serial plotter image does not look good either.
It doesn't look like the code is a problem. Are you sure you are on the right serial port?
What Arduino are you using?

[s10163741]

I am using Arduino Uno. By any chance, could noise affect the SERIAL_PLOTTER to that extent. How do i find out which serial port i am using ? If u meant the COM, i am fixed to use COM8.