KY-039 5V Hearth beat sensor detector by Finger Module Arduino

Connecting to the Arduino Sensor pin S connect to Arduino pin Analoog 0 / A0 Sensor pin + (middle pin) connect to Arduino pin 5+ Sensor pin - connect to Arduino pin GND 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); }