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RS232 to TTL Converter (MAX232) is widely used in the world of microcontrollers
minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately
meaning it works pretty much anywhere in the world
This gives you a lot of freedom how the Raspberry Pi Zero W can be used
Heart Rate (Pulse) Sensor Photo Interrupter RS232 to TTL Converter (MAX232)Introduction : 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