A vehicle-position monitoring system includes liquid-capacitive inclinometer sensor, configured to provide a measurement of grade (θ.sub.grade) of a surface over which a vehicle travels, and an accelerometer to measure acceleration of the vehicle along a principal axis (a.sub.x) of the vehicle along the surface. Direct measurement of the grade (θ.sub.grade) provides a position-tracking system with accurate information to extract acceleration due to motoring and braking (a.sub.MB) from acceleration experienced along the principal axis and track vehicle position without regard to wheel diameter calibration.

A vehicle-position monitoring system includes liquid-capacitive inclinometer sensor, configured to provide a measurement of grade (θ.sub.grade) of a surface over which a vehicle travels, and an accelerometer to measure acceleration of the vehicle along a principal axis (a.sub.x) of the vehicle along the surface. Direct measurement of the grade (θ.sub.grade) provides a position-tracking system with accurate information to extract acceleration due to motoring and braking (a.sub.MB) from acceleration experienced along the principal axis and track vehicle position without regard to wheel diameter calibration.

A tilt sensor includes a notification unit adapted to provide notification about occurrence of tilt; a water storage chamber that contains an electrolytic solution; and a unit cell that includes a positive electrode, a negative electrode, and a separator placed between the positive electrode and the negative electrode. When the water storage chamber tilts, the electrolytic solution is injected into the separator and the unit cell starts generating power and supplies electric power needed to drive the notification unit.

An avalanche self-rescue device uses an MEMS accelerometer and possibly a gyroscope in order to determine its orientation relative to the gravitational horizon. Whenever the device is oriented vertically with respect to the gravitational horizon (pointing gravitationally upwardly), a speaker emits a tone to so indicate and possibly a light illuminates in conjunction with the sound output. A different tone and possibly a different light output may be dispensed whenever the accelerometer is not oriented vertically with respect to the gravitational horizon. The device can be a standalone device, incorporated in an item of clothing, safety equipment, etc., or integrated into another electronic device such as a rescue beacon or a cellular phone.

A device may include a surface at least partially defining an enclosed region, a plurality of fluids within the enclosed region, the plurality of fluids comprising at least a first fluid having a first acoustic impedance and a second fluid having a second acoustic impedance different from the first acoustic impedance, a first piezoelectric transducer disposed on the surface, the first piezoelectric transducer being configured to generate a first wave reception signal based, at least in part, on an ultrasonic return wave received through at least one of the plurality of fluids, and a processor coupled to the first piezoelectric transducer and configured to determine a measurement of a tilt of the device based, at least in part, on the first wave reception signal.

Various example embodiments disclosed herein include systems and methods for a wall hanging system. Example embodiments include: a wall mount formed with a longitudinally elongated body having upper and lower ends and a wall-facing surface, the upper end being formed with a longitudinal rail for engaging a channel in a frame member, the wall mount including an attachment mechanism to attach the wall mount to a wall surface, the wall mount further including an embedded leveling indicator to enable level attachment of the wall mount to the wall surface; and a frame including at least one frame member, each frame member being formed with a first longitudinal channel for engaging the rail of the upper end of the wall mount, each frame member being formed with a second longitudinal channel for engaging an edge of a wall hanging item inserted into the frame.

Level tools and level indicating devices for determining the angle of a vertically oriented object relative to both level and plumb capable of being read without requiring the tool's user to change his or her position or the position of the level tool.

Level tools and level indicating devices for determining the angle of a vertically oriented object relative to both level and plumb capable of being read without requiring the tool's user to change his or her position or the position of the level tool.

An angular speed acquisition device acquires the angular speed about a road surface perpendicular axis of a leaning vehicle. The leaning vehicle includes a vehicle body frame capable of leaning in a vehicle left-right direction and a steering shaft which steers at least one of a front wheel unit and a rear wheel unit. An angular speed acquisition device, which is mountable on the leaning vehicle, includes a memory and a processor. The memory stores the relationship between the steering angle, which is a rotation angle about the rotational axis of the steering shaft, the vehicle speed of the leaning vehicle, and the angular speed ω about the road surface perpendicular axis.

A carpenter square includes a triangular body having a first edge, a second edge, and a third edge, wherein the first, second, and third edges cooperate to define a perimeter edge of the triangular body. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first position, the fence is normal to the triangular body in a first direction. In the second position, the fence is normal to the triangular body in a second direction opposite the first direction. In the third position, the fence is coplanar to the triangular body.