I voted for Supply voltage keeping one thing in mind that sooner or later we will move towards renewable sources for power generation. So, it's a great idea if we have sensors which can run longer on such sources like solar systems i.e self sustainable systems.
Improving and maximizing the accuracy of any sensor, will elevate it's efficiency, increase the range of sensitivity, and produce a more truthful and factual data output. Altogether improving the functionality and reliability of not only the data collected, but improves the very process of collection.
Keeping sensors clean and properly calibrated(when applicable), will ensure the highest level of accuracy possible.
Sometimes the raw data out from a sensor might require a lot of complex post-processing. 'Smart' sensors that can utilise special DSP techniques on the chip will make the downstream design stage much easier - especially for hobbyists who perhaps never get a full insight into these cutting edge algorithms. Therefore, more smart sensors for me please.
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