Heartbeat Sensor Module KY039

The Heartbeat Sensor Module KY039 is designed to detect a pulse while a human finger is place between the infrared diode and the photo transistor. The pulse will be represented on the signal output pin.
This sensor works by using a photo transistor to detect the presence of light, in this case how much light is passing through a finger. When blood moves, the amount of light changes and that change can be detected as a pulse.
This project uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse.
Pulse monitor works as follows: The LED is the light side of the finger, and phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted, when the blood pressure pulse by the finger when the resistance of the phototransistor will be slight changed.
We chose a very high resistance resistor R1, because most of the light through the finger is absorbed, it is desirable phototransistor sensitive enough. Resistance can be selected by experiment to get the best results.
The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.

DEVICE PINOUT & SCHEMATICS:

This module has three pins: GND, Vcc , and Signal. The pinout is as follows:

The KY-039 heartbeat sensor schematic is as follows:

CODE EXAMPLES:

Youll find below code examples of using the KY-039 heartbeat sensor with both Arduino

KY-039 HEARTBEAT SENSOR CODE EXAMPLE FOR ARDUINO

The following code example is for the Arduino. This code will read the Analog Output Sensor value and write it to the serial console, pause 500ms and repeat.

ARDUINO WIRING:

KY-039 Sensor GND to Arduino GND
KY-039 Sensor Signal to Arduino PIN A0
KY-039 Sensor Vcc to Arduino 5V

int ledPin=13;
int analogPin=0;
 
void setup()
{
  // The included LED of the Arduino (Digital 13), will be used as output here.
  pinMode(ledPin,OUTPUT);
   
  // Serial output initialization
  Serial.begin(9600);
  Serial.println(&amp;quot;Heartbeat detection example code&amp;quot;);
}
 
const int delayMsec = 60; // 100msec per sample
 
// The main program has two tasks: 
// - The LED will light up after detecting a heart beat
// - Calculating of the pulse and outputting of it at the serial out.
 
void loop()
{
  static int beatMsec = 0;
  int heartRateBPM = 0;
      Serial.println(rawValue);
  if (heartbeatDetected(analogPin, delayMsec)) {
    heartRateBPM = 60000 / beatMsec;
    // LED-output for the heart beat heart beat
    digitalWrite(ledPin,1);
 
    // Output of the serial data
    Serial.print(rawValue);
    Serial.print(&amp;quot;, &amp;quot;);
    Serial.println(heartRateBPM);
     
    beatMsec = 0;
  } else {
    digitalWrite(ledPin,0);
  }
  delay(delayMsec);
  beatMsec  = delayMsec;
}

Pinout

This module has 3 pins:

S: Analog output signal
VCC: Module power supply 5V
GND: Ground

You can see the pinout of this module here.

Required Materials

Hardware Components

Arduino UNO R3	×	1
Module	×	1
Male to Female jumper wire	×	1

Software Apps

Arduino IDE

Interfacing with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to this module. Connect wires accordingly.

Step 2: Code

Upload the following code to Arduino. After that open the Serial Plotter.

    /*

  Made on Jan 16, 2021

  By MehranMaleki @ Electropeak

  Home

*/



void setup() {

  pinMode(A0, INPUT);

  Serial.begin(9600);

}



void loop() {

  float pulse;

  int sum = 0;

  for (int i = 0; i < 20; i  )

    sum  = analogRead(A0);

  pulse = sum / 20.00;

  Serial.println(pulse);

  delay(100);

}

In this code, pin A0 of Arduino is used to receive the analog output data. In order to reduce the effect of noise on output, the average of last 20 output data is used. By placing your finger on the module, you can see how it works.

The output is as follows.

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