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Pulse sensor Arduino is used to test the heart rate sensor, students, artists, athletes, creator, game developer, or mobile terminal can develop interactive work related to heart rate. Sensors can be put on the finger or earlobe, through interconnected line can be connected to the Arduino. 1. Heart beat indication by LED 2. Instant output digital signal for directly connecting to microcontroller 3. Compact Size 4. Working Voltage +5V DC It also has an open source app, can real time your heart rate graph display. Essence is a integrated optical amplifying circuit and noise eliminating circuit heart rate sensor.