Suggest few nice and "novel" intermediate level projects based on Arduino (not RPi)

@Michelle @Floydian @RantSomeWhere
Plz help

@RantSomeWhere I saw them but they didn't seem to be "novel"

@RantSomeWhere earlier I was thinking to make a robotic arm to grab things and bring them someone but this didn't seem to be "novel"
Professor demands "novel" things

@RantSomeWhere thanks for finding another one on request but I already considered it earlier and feel that this could be done with printer(not tracing but atleast things could be printed also *hope you get what I'm trying to convey*).

And, by novel I understand which could be useful for society.(correct me if I'm wrong)

@RantSomeWhere Thanks for giving your time

simon says.

music projects.

robot car+cayenne/azure with a nodeMCU or an wifi shield.

Soil management system for farmers.

Flying stuff.

@navin planning for sign to English converter