Implementations of a fluid flow sensing assembly may include a first shell coupled with a second shell including a central vane structure; a blade assembly rotatably coupled within the central vane structure, the blade assembly including one or more flags extending from a central hub; and a one or more fluid flow sensor elements coupled with the second shell of the flow sensor, the one or more fluid flow sensor elements configured to detect motion of the one or more flags where the assembly may be configured to be coupled with one or more scent diffusers.