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5V Finger Measuring Heartbeat Sensor Senser Detector Module

3.2" TFT LCD Module
Item Code: TOP862696
Market Price:
USD $0.99
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$0.95
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SKU:
862806
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  • Description
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Specifications

Features

  • 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()
{
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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