If I sit behind computer, some arduino (

If I sit behind computer, some arduino (or similar) with camera and sound module will recognize me and greets me. If it will not recognize me, start some kind of alarm...

Different alerts for different users..

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Will this idea be useful for me if realized?
If this idea will be reality, would you use it often?
I want to actively cooperate on this project
This will be publicly available in your account. So people can contact you.
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How much will I pay for this?

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