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RS232 to TTL Converter (MAX232) is widely used in the world of microcontrollers
and humidity from 20 to 80% with 5% accuracy
Minimum Operating Supply Voltage : 4
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