A sensor switch includes an insulated housing having an inner wall surface that defines a through hole. The through hole has a shoulder interconnecting large and small diameter hole sections thereof. A first conductive terminal includes a head portion embedded in the large diameter hole section and having a first contact surface. A plug portion of a second conductive terminal is embedded in the large diameter hole section spaced apart from the head portion and has a second contact surface facing the first contact surface. The inner wall surface and the first and second contact surfaces cooperatively confine a sensing chamber. At least one conductive member is rollably accommodated in the sensing chamber.

A sensor switch includes an insulated housing having an inner wall surface that defines a through hole. The through hole has a shoulder interconnecting large and small diameter hole sections thereof. A first conductive terminal includes a head portion embedded in the large diameter hole section and having a first contact surface. A plug portion of a second conductive terminal is embedded in the large diameter hole section spaced apart from the head portion and has a second contact surface facing the first contact surface. The inner wall surface and the first and second contact surfaces cooperatively confine a sensing chamber. At least one conductive member is rollably accommodated in the sensing chamber.

A device includes two electrically isolated metalized posts attached in close proximity to each other on a bendable substrate. When the bendable substrate bends concavely with respect to the surface onto which the posts are mounted, the distance between the tops of the two posts decreases. At a fixed bending curvature, the two posts will meet and complete an electrical circuit. The posts comprise a flexible material so that the meeting of the posts has minimal effect on the spring constant or damping coefficient of the harmonic oscillation.

A collision sensor assembly is attachable to a stationary structure such as a pallet rack, a door frame, the corner of a wall, or the like. The collision sensor is configured to sense when a collision occurs with the stationary structure such as when a piece of movable machinery contacts the stationary structure. The collision sensor assembly includes a sensor operatively connected to a processor which determines when a collision occurs, and produces a signal to an output signal generator to provide an external indication of the collision.

A collision sensor assembly is attachable to a stationary structure such as a pallet rack, a door frame, the corner of a wall, or the like. The collision sensor is configured to sense when a collision occurs with the stationary structure such as when a piece of movable machinery contacts the stationary structure. The collision sensor assembly includes a sensor operatively connected to a processor which determines when a collision occurs, and produces a signal to an output signal generator to provide an external indication of the collision.

A collision sensor assembly is attachable to a stationary structure such as a pallet rack, a door frame, the corner of a wall, or the like. The collision sensor is configured to sense when a collision occurs with the stationary structure such as when a piece of movable machinery contacts the stationary structure. The collision sensor assembly includes a sensor operatively connected to a processor which determines when a collision occurs, and produces a signal to an output signal generator to provide an external indication of the collision.

An environmental physical sensor is provided that includes a power input terminal, a sensor output terminal, and a resonant switch. The resonant switch includes a mechanical element that is responsive to an environmental stimulus and is coupled to an electrical switch. The electrical switch is operable between an open position and a closed position and electrically connects the power input terminal to the sensor output terminal when in the closed position. The mechanical element is configured to intermittently actuate the electrical switch into the closed position responsive to the environmental stimulus.