Circuit design, programming and IOS app. -- 2

It requires the design of a circuit that has a sensor that can measure a distance of 5 cm to 500 cm with a resolution of 1 mm. You must maintain that resolution throughout the distance to be measured. More details about the PCB layout will be given to those who really have a proposal on which sensor can be used for this project.

(Preferably, be able to make the design in eagle or fusion 360).