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Finger Measuring Heartbeat Sensor Module for Arduino

350187

New product

KWD 1.500

  We chosse 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.

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    Finger Measuring Heartbeat Sensor Module for Arduino

    Finger Measuring Heartbeat Sensor Module for Arduino

      We chosse 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.

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product description

It 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 photo transistor 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.

When running the program the measured values are printed. To get a real heartbeat from this could be challenging.

Connecting to the 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

Example Code

// 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);
}

 

We chosse 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.

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