Is it necessary that the smart sensor be equipped with a wireless communication system?
it all depends on the context and what the smart sensor is designed to achieve
I'd say no. I suppose you define "smart sensor" as a sensor that incorporates some amount of on-board processing. Even if this processing amounts to nothing more than creating a digital word out of the measured parameter. Very frequently, maybe most of the time, such sensors are wired to a cabled network. For example, in machinery.
To be smart, it would require some kind robust communication.
The sensed signal needs to be processed for further observations and it may be required to send some where else. So, in this type of cases we need in built wireless communication systems.
It is not always required to have wireless communication for smart sensors. It depends on the application , kind of processing required and volume of data. The smart sensor output can be transferred using Bluetooth, wireline media, WLAN as well.
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