It is easy to use a Pulse sensor that can be used to detect the Heart Rate of a Person. Heart rate is essential to determine your health and also to monitor while working out or running. This works on a principle called photoplethysmography, which means the changes in the volume of blood in an organ is measured by the changes in the intensity of the light passing through that organ hence the emitted light from the LED will be received by photosensor only when there is blood in the vein hence measuring the pulse. The output signal is further conditioned and filtered to give the final output. 

SPECIFICATIONS

• Operating Voltage: +5V or +3.3V
• Plug and Play type sensor
• Maximum Current Consumption: 4mA
• Inbuilt Amplification and Noise cancellation circuit.
• Small Size makes it suitable for battery-powered devices.
• Diameter: 0.625”
• Thickness: 0.125” Thick