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This gives you a lot of freedom how the Raspberry Pi Zero W can be used
Minimum Operating Supply Voltage : 4
with this I2C interface module
meaning it works pretty much anywhere in the world
This pulse can be used to enable the nextcascaded stage
Heart Rate (Pulse) Sensor Photo Interrupter This gives you a lotIntroduction : Pulse Sensor is a well designed plug and play heart rate sensor for Arduino. It can be used bystudents, artists, athletes, makers, and game & mobile developers who want to easily incorporate live heart rate data into their projects. The sensor clips onto a fingertip or earlobe and plugs right into Arduino with some jumper cables. It essentially combines a simple optical heart rate sensor with amplification and noise cancellation