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KY-039 5V Heartbeat Sensor Senser Detector Module Finger Measuring For

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RM 15.00
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From Wilayah Persekutuan / Kuala Lumpur , Estimated Arrival 1-3 working days.  
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ItemID
179997130
Ship To
Within Malaysia ,Ship By: Courier Services
Views
203
Available Quantity
4
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Seller Information
mcs123
Store since 21 Oct 2013

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Item Specification
  • Report
  • Model / SKU : KY-039
    Conditions : New

    Product Description


    KY-039 5V Heartbeat Sensor Senser Detector Module Finger Measuring For

    Features:


    1.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.
    2.Chosing 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.


    Arduino Test Code
    int ledPin=13;
    int sensorPin=0;

    double alpha=0.75;
    int period=20;
    double change=0.0;

    void setup()
    {
    pinMode(ledPin,OUTPUT);
    }

    void loop()
    {
    static double oldValue=0;
    static double oldChange=0;
    int rawValue=analogRead(sensorPin);
    double value=alpha*oldValue+(1-alpha)*rawValue;
    change=value-oldValue;

    digitalWrite(ledPin,(change<0.0&&oldChange>0.0));

    oldValue=value;
    oldChange=change;
    delay(period);





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