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 }

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////////// ///////// 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

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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.