This silly weekend project is a humidity sensor for plants that has a rotating wheel for the alarm mechanism. A receptable on the wheel can take a pole with a flag. I winged that part.

A case in the shape and size of a tea caddy with a pen protuding ouf of the top. A post-it with “Help” written on it sticking to the top of the pen. The case sits on the soil in a flowerpot. Close-up view from the top into the case some openings. The design of the case in a CAD software