Pulse Checking Sensor Using Arduino Mega 2560

Introduction

In this article, I will explain about how to correctly check the pulse in our body and sense the correct pulse signal in mobile or system. We will perform this using Arduino Mega 2560.

 

Parts

• Arduino Mega 2560 
• Pulse sensor 
• HookUp Wires 

Pulse sensor

 
Figure 1: Pulse Sensor 

• Pulse sensor is a plug-and-play heart-rate sensor for Arduino Mega 2560 
• It can be used to check the pulse in our body.
• It can be used by students, artists, and developers.  

Connection

In the pulse sensor they can have the 3 pin,

• The first can be a negative pin connected to the Gnd of the Arduino Mega 2560.
• The second can be a positive pin connected to the 5V of the Arduino Mega 2560. 
• The third can be a input pin connected to the Analog pin A0 of the Arduino Mega 2560.  

Programming

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


// these variables are volatile because they are used during the interrupt service routine!
volatile int BPM;                   // used to hold the pulse rate
volatile int Signal;                // holds the incoming raw data
volatile int IBI = 600;             // holds the time between beats, must be seeded!
volatile boolean Pulse = false;     // true when pulse wave is high, false when it's low
volatile boolean QS = false;        // becomes true when Arduoino finds a beat.

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

}
void loop()
{
  sendDataToProcessing('S', Signal);     // send Processing the raw Pulse Sensor data
  if (QS == true)
{                                        // Quantified Self flag is true when arduino finds a heartbeat
        fadeRate = 255;                  // Set 'fadeRate' Variable to 255 to fade LED with pulse
        sendDataToProcessing('B',BPM);   // send heart rate with a 'B' prefix
        sendDataToProcessing('Q',IBI);   // send time between beats with a 'Q' prefix
        QS = false;                      // reset the Quantified Self flag for next time
}
 ledFadeToBeat();

  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
  }


void sendDataToProcessing(char symbol, int data ){
    Serial.print(symbol);                // symbol prefix tells Processing what type of data is coming
    Serial.println(data);                // the data to send culminating in a carriage return
  }

Explanation

• Check the pulse in monitor / smart mobile.
• When the pulse is normal the LED blinks.
• We can monitor the pulse with the correct data and symbol. 

Output

 
                           Figure 2: Output

 

Read more articles on Arduino:

• Arduino Due and Mobile Service
• LDR Using Arduino Mega 2560