Finger Detection Heartbeat Pulse Module KY-039 (IR & Phototransistor)

This 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 slightly changed. The project's schematic circuit as shown, We chose a very high resistance resistor R1, because most of the light through the finger is absorbed, it is desirable that the phototransistor is 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.

Features

• Use IR LED and optical transistor to detect pulsation in fingers

Application

• Synthesized teaching experiment

Specifications

• Working voltage: 5V DC
• On-board RT9161
• Size: 24 x 22 x 8mm

Connect to an Arduino

• Sensor pin S connect to Arduino pin Analoog 0 / A0
• Sensor pin + (middle pin) connect to Arduino pin 5+
• Sensor pin - connect to Arduino pin GND

// Pulse Monitor Test Script
int sensorPin = 0;
double alpha = 0.75;
int period = 100;
double change = 0.0;
double minval = 0.0;

void setup()
{
  Serial.begin (9600);
}

void loop()
{
    static double oldValue = 0;
    static double oldChange = 0;
 
    int rawValue = analogRead (sensorPin);
    double value = alpha * oldValue + (1 - alpha) * rawValue;
 
    Serial.print (rawValue);
    Serial.print (",");
    Serial.println (value);
    oldValue = value;
 
    delay (period);
}