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5V Finger Measuring Heartbeat Sensor Senser Detector Module

3.2" TFT LCD Module
Item Code: TOP862696
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  • Description
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  • 100% Brand new and high quality!
  • 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.
  • 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.

Shipping List

  • 5V Finger Measuring Heartbeat Sensor Senser Detector Module: 1pcs

Test Code

int ledPin=13;
int sensorPin=0;
double alpha=0.75;
int period=20;
double change=0.0;
void setup()
void loop()
static double oldValue=0;
static double oldChange=0;
int rawValue=analogRead(sensorPin);
double value=alpha*oldValue+(1-alpha)*rawValue;


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