Re: [sensors] Clarify scope of generic sensor

Sensors take measurements and produce values that are defined in terms
 of a standard unit. By definition, cameras and audio microphones are 
a kind of "sensor" and both use sensors to achieve their purpose—but 
neither are a tool solely used to measure some specific environmental 
attribute and produce a standard unit value for that measurement. 
Wikipedia covers the subject nicely: 
https://en.wikipedia.org/wiki/Sensor

Bluetooth isn't a sensor, it's a standard protocol for transporting 
data over short distances.



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