Pulse Heart Beat Rate Amped Sensor

Pulse Sensor is a simple plug-and-play heartbeat sensor for Arduino. The sensor clips onto a fingertip or earlobe and plugs right into Arduino with some jumper cables.
It also includes an open-source monitoring app that graphs your pulse in real-time.
It is widely used by students, artists, athletes, makers, and game & mobile developers who want to easily incorporate live heartrate data into their projects.
It combines a simple optical heart rate sensor with amplification and noise cancellation circuitry making it fast and easy to get the reliable pulse readings.
Also, it sips power with just 4mA current draw at 5V so it’s great for mobile applications.