Pulse sensor

Pulse sensor
The pulse sensor is used to test the heart rate. Students, artists, athletes, creators, games or mobile terminal developers can develop interactive works related to heart rate. The sensor can be worn on a finger or earlobe and connected to the Ard via a wire.
It also has an open source app that displays your heart rate in real time.
The essence is an optical heart rate sensor that integrates an amplifying circuit and a noise canceling circuit.
Supply voltage: 3V or 5V.