Physics gadgets are all made using different methods or reading physics joint positions/angles to create events that simulate buttons, levers, and sliders.
These components are user-friendly interfaces that use Unity Events to allow for event and method calls without creating additional code (just like Unity's UI button)
Gadgets: are designed using a base reader class with some value customizability. The Hinge Angle Reader base uses a Hinge Joint and reads its angle limits. The Configurable Limit Reader reads the Configurable Joint Limit. Usually, the reader will default from (1 to -1) representing open/closed, with the center at 0.
For Hand Touch and Trigger interactions see: