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5pcs ky-039 finger measuring heartbeat sensor module for arduino brand new, US $250 – Picture 0
5pcs ky-039 finger measuring heartbeat sensor module for arduino brand new, US $250 – Picture 0

5pcs Ky-039 Finger Measuring Heartbeat Sensor Module For Arduino Brand New

US $250

  • Shanghai, China
  • Jun 9th
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5pcs ky-039 finger measuring heartbeat sensor module for arduino brand new   Product Description:    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.    ARDUINO test code.    // Pulse Monitor Test Script.    int ledPin = 13.    int sensorPin = 0.    double alpha = 0.75.    int period = 20.    double change = 0.0.    void setup ().    {.    pinMode (ledPin, OUTPUT).    Serial.begin (115200).    }.    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).    }.    vwoyv zoqui jdtcp OME Buyer should pay within 7 days after purchase. We only accept payment via PayPal. Our team focuses on providing high quality products with reasonable price and tries its best to keep transactions as simple as possible. Please be confident of and enjoy your shopping here! Please feel free to contact us via eBay message system or email.

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