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By using neural network we can learn the habbits of early-in-the-morning public transport delays. We can guess if our train will be delayed depending on previous trains on that day. If our train is likely to be delayed -> wake up a few minutes earlier to catch the previous one.

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What to do in case of opposite commands (Dad: turn off the lights vs. Kid: turn on the lights). RBAC? If the kid doesn't behave well, their access can be revoked to modify the state of lights. Good daddy

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Income and spending

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I think it's illegal to "use" these databases without permission. <-- we need permission
Recipe: https://opendata.stackexchange.com/questions/4283/open-downloadable-recipe-database
Books:
https://opendata.stackexchange.com/questions/4290/public-database-of-book-titles/4297#4297
https://openlibrary.org/
Maybe? Nice!

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Should use some existing recipe database online...

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Bayesian + neural network.

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How can the user enter their house layout? It might be trivial on a PC but we also need to consider smart phone users as well.
And are areas and shapes important? From the basic lightswitch perspective: I guess not, but there might be other things.

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We should store the map of the full house for later. Each room shall have a temperature sensor (also usefull for the plants)

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A book can be located by the room and the number of the shelf.

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Which platforms should we support? I think browser + smartphone (at least Android and iOS) is a must have nowadays. What technologies should we use?

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Soil moisture and pH sensors are needed (both exist, yey). We need to store the current plant and it's location (the room; window/not window)

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The currently owned books with their author, name, place in the house, cathegory and description (last two can be imported from goodread, or something like that)

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How to manage items, like potato? You buy like 5 kg, than use 5 piece for cooking. How do we register the change?

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Where we store the food we have at home.
Each item should contain:
name (eg. potato); date of buying (automatic); expiration date; date of opening.