Finger Detecting Heart Beat Measuring Sensor Module
Ky-039 is a Low-cost Heartbeat Sensing Module. This Heartbeat detection module uses bright infrared (IR) led and a photo-transistor to detect the pulse of the finger, a red led flashes with each pulse. Pulse monitor works as follows: the led is Turned ON on one side of the finger, and the photo-transistor is on the other side of the finger. The photo-transistor used to obtain the flux emitted, when the blood flows through the finger then the resistance of the photo-transistor will vary slightly. The most important is to keep the shield stray light into the photo-transistor. For home lighting that is particularly important because the lights at home mostly based on 50hz or 60hz fluctuates, so a faint heartbeat will add considerable noise.
Features/Specs:
- Input Voltage: 5VDC
- Use IR LED and an optical transistor to detect pulsation in fingers
- Small and Compact module
- Easy to use
- Length: 20mm
- Width: 14mm
- Weight: 0.6mm
Package Includes:
- 1 x Finger Detecting Heart Beat Measuring Sensor Module
Useful Links: Video
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);
}
Note: Product Images are shown for illustrative purposes only and may differ from the actual product.
debamon –
Pulse measurement sensor!