Haptic interface for simulating push-buttons

General purpose haptic interfaces are receiving increasing attention, because they can simulate different kinds of interaction between user and virtual objects/environments. The paper describes a special-purpose haptic interface devoted to simulate the behavior of a push button, for performing user tests on different geometries and designs. In particular, the paper focuses on the control of the interface presented, whose task is to provide a reaction to the external stimulation as similar as possible to that of real buttons