HiLetgo 5pcs 5V Heartbeat Detect Sensor Heart Rate Detect Measuring Module Measure Finger

Description: Finger heartbeat measurement module arduino test code: INT led Pin=13; INT sensor Pin=0; Double alpha=0.75; INT period=20; Double change=0.0; Void setup {Pin Mode (led Pin, OUTPUT)} void loop Static double old Change=0; INT raw Value=analog Read (sensor Pin); Double value=alpha*old Value+(1-alpha)*raw Value; Change=value-old Value; Digital Write (led Pin,(change<0.0&&old Change>0.0)); Old Value=value; Old Change=change; Delay (period); Package Included: 5 * Finger Measuring Heartbeat Sensor Module