Abstract: A processor-based personal electronic device (such as a smartphone) is programmed to automatically respond to data sent by various sensors from which the user's activity may be inferred. One or more alarms on the device may be temporarily disabled when sensor data indicates that the user is asleep. One or more of the sensors may be worn by the user and remote from the device. A wireless communication link may be used by the device to obtain remote sensor data. Data from on-board sensors in the device—such as motion sensors, location sensors, ambient light sensors, and the like—may also be used to deduce the user's current activity. User data (such as calendar entries) may also be used to determine likely user activity and set alarms accordingly. Biometric data from a second, nearby person may also be used to automatically select certain alarm modes on a first person's device.

Abstract: A method and a device for monitoring the rotational speed of an element are disclosed. The element may be part of a centrifuge, e.g. a motor, drive shaft, or rotor of a laboratory centrifuge. The rotational speed of the element is not determined directly, but rather clock cycles are counted while the element rotates by a predetermined rotational angle. Exceeding a predetermined rotational speed is determined by comparing a number of counted cycles with a predetermined value. The method and device can be implemented in hardware without requiring a microcontroller with corresponding software, thereby eliminating a need to software certification.

Abstract: A positioning sensor includes m receiving antennas connected to a feeder circuit and n variable loads, and a receiver that receives a first signal via the m receiving antennas. The positioning sensor further includes a memory that stores a first signal strength value of a first signal that the receiver receives when a variable load varies in value, and a processor that calculates a second signal strength value from a complex propagation channel, searches for a complex propagation channel candidate that has a minimum difference between a first signal strength and a second signal strength, determines the complex propagation channel candidate to be a complex propagation channel when the receiver receives the first signal, and estimates an incoming direction of the first signal from the determined complex propagation channel.

Abstract: Disclosed are angle sensing devices and gimbal platforms adopting the same. One angle sensing device disclosed herein comprises: a rear cover provided with an upper fitting face; a bracket provided with a lower fitting face, the lower and upper fitting faces being arranged to face each other and spaced apart from each other by a pre-set spacing; and a sensor mounting plate for mounting an angle sensor; wherein the sensor mounting plate is provided between the upper and lower fitting faces, and the pre-set spacing is greater than the thickness of the sensor mounting plate, such that the sensor mounting plate is movable between the upper and lower fitting faces.

Abstract: A control system for a child swing that comprises a drive mechanism that includes a motor configured to impart torque to the at least one swing arm so that a child seat moves in an arcuate path. A phase control subsystem generates a motor drive signal configured to maintain a desired lead angle between a phase of the drive mechanism and a phase of the swing arm. An amplitude control subsystem configured to steer the phase control subsystem based on a correlation of an actual height of the child seat to a selected height of the child seat.

Abstract: A drill bit is disclosed including a rigid cutting tool elongated along a central axis having opposed sides, where one side includes a cutting edge and an opposing side includes a shank for selective engagement with a drill chuck. The drill bit includes a first light path capable of communicating light between the shank side of the drill bit and the cutting edge side of the drill bit. The drill bit may be used with a breach assessment mechanism including a light source configured to provide selective illumination along the light path and a light sensor. Processor logic may be programmed to assess signals from the light sensor indicative of reflected light from a cutting surface contacting the cutting side of the drill bit.

Abstract: A safety light system integrated into a vehicle. The safety light system includes a safety light assembly receptacle carried by a body panel of a vehicle. The safety light assembly receptacle includes a light assembly receiving cavity for receiving and temporarily retaining a removable light assembly. The removable light assembly includes elements to provide a user controlled continuous red light, a flashing red light, and a continuous white light. The flashing red light provides a roadside flare configuration. The continuous white light provides a flashlight configuration. The continuous red light in conjunction with the flashing red light configuration provides a driving light configuration. The removable light assembly can include a securing mechanism for attaching the removable light assembly to an object to warn others of the extended object and/or support legs enabling operation as a roadside flare, spotlight, and the like.

Abstract: An indication circuit for indicating the rotation speeds of fans of a server includes a connector, a microprocessor, a number of light emitting diodes (LEDs) and resistors which correspond to the LEDs one-to-one. The connector is connected to the fans. The microprocessor is connected to the connector and utilized to receive the rotation speed signals of the fans from the connector. A cathode of each LED is connected to a corresponding output terminal of the microprocessor through a resistor, and anodes of the LEDs are connected to a power source.

Abstract: A device for continuously monitoring an elevation, ?, from horizontal of a backrest against which a backbody of an individual may lean, to provide an automatic notification in the event the elevation, ?, falls below a prescribed value.

Abstract: An electronic device includes a case, an angular velocity sensor fixed to the case, a data memory storing plural reference profiles, an output unit operating in a plurality of operation modes corresponding to the reference profiles, and a processor controlling the output unit. The angular velocity sensor sends a signal according to an angular velocity applied to the case. The processor is operable to receive the signal sent from the angular velocity sensor, to select a reference profile out of the plural reference profiles according to the received signal, and to cause the output unit to operate in an operation mode out of the plural operation modes corresponding to the selected reference profile. A user can operate this electronic device with a quick response.

Abstract: A drop sensor detects a drop of a device. When the drop of the device is detected, a sub CPU allows a counter to count a drop time. When the device drops for a predetermined time or more, the sub CPU controls a regulator so that the regulator forcibly disconnects an electric power to be supplied to a hard disc, and writes a drop occurrence flag into a nonvolatile memory. When the power supply is again turned on, a main CPU allows a display section to display information indicating that the power supply is disconnected due to the drop of the device.

Abstract: A gesture-based user interface comprises a wearable portable device storing a gesture profile for each of a plurality of different applications on the wearable portable device to define different gestures for the different applications, wherein each of the gesture profiles includes at least one gesture and a predetermined function associated with the at least one gesture; and a profile web service, wherein the portable device is in communication with the profile web service and is configured to download from the profile web service to the wearable portable device a customizable gesture profile for a particular one of the applications, wherein the customized gesture profile modifies at least one of the different gestures, the customized gesture profile comprising personal preferences of the user regarding the modified gesture, including physical attributes of the user.

Abstract: An infant swing apparatus comprises a first pivot shaft coupled with a swing arm, a motorized drive unit configured to drive rotation of the first pivot shaft in alternate directions, and a swing motion sensing unit including an encoder wheel securely mounted with a second pivot shaft. The second pivot shaft is directly coupled with the first pivot shaft in angular displacement via frictional interaction. As a result, the rotation of the first pivot shaft and corresponding swing motion can monitored in a precise manner.

Abstract: A rotation speed information detection apparatus, including: a wheel sensor for detecting passage of teeth of a gear provided in association with tires of a vehicle; a number-of-teeth calculation means for calculating the number of teeth of the gear passed per a sampling cycle set in advance; and a wheel speed calculation means for regularly calculating rotation speed information of the tire with using the number of teeth calculated. The number-of-teeth calculation means is configured to use a ratio between time information at the point and a remaining time until the time at which the next sampling cycle is started is reached to thereby calculate the number of remaining teeth to calculate the number of teeth passed during the sampling cycle.

Abstract: The disclosure relates to sound playback and editing apparatus. The editing apparatus uses user interaction to allow the user to instinctively modify recorded sound. This can be achieved by converting a quality of the user's physical interactions with the editing apparatus into instructions for processing the sound. For example, in one embodiment the user can mix sound files by ‘mixing’, i.e. shaking, physical representations of those sound files (such as the recording medium on which the files are stored) alone or together.

Abstract: In the normal rotation direction, a change in the main sensing signal caused by a front edge is defined as a signal change caused by an effective edge, and a change in the main sensing signal caused by a back edge is defined as a signal change caused by an ineffective edge. In the reverse direction, a change in the main sensing signal caused by the back edge is defined as a signal change caused by an effective edge, and a change caused by a front edge is defined as a signal change caused by an ineffective edge. Regardless of the rotation direction, a detection signal generating circuit generates a detection signal including falling-edge changes and rising edge changes caused by the effective edge and ineffective edge respectively. When the direction is changed, the signal change on the detection signal is prohibited. As a result, gear tooth detection discrepancies are prevented.

Abstract: A drop sensor detects a drop of a device. When the drop of the device is detected, a sub CPU allows a counter to count a drop time. When the device drops for a predetermined time or more, the sub CPU controls a regulator so that the regulator forcibly disconnects an electric power to be supplied to a hard disc, and writes a drop occurrence flag into a nonvolatile memory. When the power supply is again turned on, a main CPU allows a display section to display information indicating that the power supply is disconnected due to the drop of the device.

Abstract: Apparatus, systems and methods for dispensing sheet material from a roll which include a low-material sensing system. The low-material sensing system provides an indication when the sheet material approaches depletion or is depleted so that the depleted sheet material roll can be replaced with a full roll. The low-material sensing system determines that the sheet material is depleted or near depletion by comparing the rotational speed of a sheet material roll from which the sheet material is unwound with the speed of the motor which produces movement of the sheet material roll when power is supplied to the motor. The sheet material roll speed increases as material is unwound while the motor speed remains relatively constant. A low-material indication is provided when the comparison reaches a threshold representative of the low-material state.

Abstract: Various embodiments of the invention include a motor system for driving a swing and controlling the speed and/or amplitude of the swing. In one embodiment, the motor system includes a DC motor, a swing velocity sensor system, and a swing velocity control circuit. The DC motor drives the swing through at least one fill swing cycle, and then the motor is allowed to free-wheel for at least a half swing cycle. During the free-wheeling half cycle, the swing velocity sensor system measures the velocity of the swing and compares the measured velocity to a goal velocity. The control circuit increases or decreases the velocity depending on this comparison. In other embodiments, the system includes a swing amplitude sensor system that measures the amplitude of the swing and a swing amplitude control circuit that compares the measured amplitude to a goal amplitude.

Abstract: Component removal detection may be accomplished by a variety of systems and techniques. In one embodiment, a system for component movement detection may include a payment module, a fuel dispenser, and a movement detection device. The fuel dispenser may receive the payment module and enclose the payment module at a first position defined by a fixed position of the payment module relative to the fuel dispenser. The movement detection device may be communicably coupled to the payment module and may detect a first value at the first position and a second value at a second position of the payment module, where the second position may be different from the first position. Further, the movement detection device may transmit the second value to the payment module, where the payment module may activate a security measure based upon a difference in the first and second values greater than an adjustable absolute limit.

Abstract: A method for implementing program execution integrity (PEI) for a communication-based sensor includes receiving an output communication message from the sensor, the output communication message including sensor output data internally processed within the sensor. The output communication message further includes raw data used by the sensor in internally processing the sensor output data. The raw data is independently processed, and the results thereof are compared with the internally processed sensor output data so as to verify the processing integrity of the sensor to a desired tolerance.

Abstract: An electronic device includes a case, an angular velocity sensor fixed to the case, a data memory storing plural reference profiles, an output unit operating in a plurality of operation modes corresponding to the reference profiles, and a processor controlling the output unit. The angular velocity sensor sends a signal according to an angular velocity applied to the case. The processor is operable to receive the signal sent from the angular velocity sensor, to select a reference profile out of the plural reference profiles according to the received signal, and to cause the output unit to operate in an operation mode out of the plural operation modes corresponding to the selected reference profile. A user can operate this electronic device with a quick response.

Abstract: A method and arrangement for detecting rotational movement. The method comprises the steps of arranging a sensor at the end of a rotation axle of a rotating object and at a distance from the rotation axle, arranging a detector external to the end of the rotation axle of the rotating object in such a manner that the distance between the sensor and detector changes as the object turns around its rotation axle, transmitting an poll to from the detector to the sensor, receiving the poll at the sensor, and in response to receiving the poll, transmitting a reply from the sensor to the detector, determining the power used in signaling, and detecting rotational movement on the basis of the change in signaling power.

Abstract: A rotary encoder using built-in self test ability with redundant and fault tolerant position sensing. Wherein the rotary encoder is used with a variety of rotary equipment including a valve actuator including the generation of speed data (1). The use for diagnosing valve actuator problem and other rotary equipment includes the frequency analysis performed upon speed or position or torque or thrust or vibration data including the speed or position data of the valve provided by the rotary encoder.

Abstract: A fan failure alarm device includes a first digital-analog converting circuit (200), a first diode (D11), a switching circuit (260), an input-output (I/O) controller (U11), and an alarm circuit (270). The first digital-analog converting circuit receives a digital pulse signal from a first fan, and outputs a direct current (DC) voltage signal at an output terminal. The first diode with a cathode coupled to the output terminal of the first digital-analog converting circuit, the first diode turns on when the first fan stops rotating. The switching circuit with an input terminal coupled to an anode of the first diode, outputs a first control signal when the fan rotates normally and outputs a second control signal when the fan stops rotating. The input-output (I/O) controller receives the first and second control signals from the switching circuit, and outputs an alarm signal when receives the second control signal. The alarm circuit receives the alarm signal from the I/O controller, and activates an alarm.

Abstract: A signal incoming direction estimation apparatus is constructed so as to comprise a sensor array having plural sensors and the impedance of each of the sensors being set to a predetermined value, respectively, and a variable impedance adjustment means having a variable impedance, being selectively connected to any one of the sensors of the sensor array, and controlling the current distribution of each of the above-mentioned sensors. Due to this, it becomes possible for the signal incoming direction estimation apparatus to carry out a beam scan only by manipulating at least one impedance without simultaneously manipulating all of the sensor impedances and thereby a high-speed beam scan (directional control) becomes possible.

Abstract: The present invention discloses a solution for protecting RFID encoded content based upon a spin rate of a media within which an RFID tag containing the content is embedded. The solution can include a step of securing tag encoded content stored on an RFID tag embedded in an optical media. A spin rate the optical media can be determined. The tag encoded content can be selectively unprotected when the detected spin rate is approximately equal to a previously established rate or is between a previously established range of values. The spin rate can be based upon a rotational velocity of the optical media and/or a rotational acceleration of the optical media.

Abstract: The invention relates to construction principles, operating and manufacturing methods for inertial sensors, i.e., sensors for rapidly detecting movement and acceleration in all degrees of freedom in space, and for separately detecting the position with respect to the perpendicular under the action of acceleration due to gravity. Use is made of the knowledge that to maintain a common convection zone of two or more sensor elements, the power fractions supplied to these elements vary with change in position, movement and acceleration.

Abstract: Electrical connection system between a wheel and a bearing-hub assembly, the wheel being mounted on an outer flange of the bearing-hub assembly, and the bearing-hub assembly comprising a rotationally fixed outer ring attached to the vehicle's suspension and an inner ring provided with a centering collar, an open frontal cavity defined in the said centering collar and an axial cavity opening into the said cavity; the connection system having a first connection cable attached to the inner ring and extending inside the axial cavity and the frontal cavity, a second connection cable integrated with the wheel, and a connection element associated with the said centering collar to provide electrical contact that can be selectively disconnected between the first cable and the second cable.

Abstract: Peripherals and data processing systems are disclosed which can be configured to interact based upon sensor data. In at least certain embodiments, a method for sensing motion and orientation information for a device includes receiving a motion event from at least one sensor located in a device. The method further includes determining an orientation for a display of the device. The method further includes determining whether the device is currently moving. The method further includes determining whether the device moves within an angle with respect to a ground reference for a first time period. The method further includes switching the orientation of the display of the device if the device moves in excess of the angle.

Abstract: The invention relates to a system for detecting the rotational motion of a shaft in a machine housing, comprising a measuring transmitter, which is connected to the shaft, at least one measuring sensor, which is provided on the machine housing, and a measuring transducer connected to a measuring sensor. The invention is characterized in that the measuring sensor(s) (8 and 15 to 20) is/are supplied with current by a separate energy accumulator (11).

Abstract: A method and apparatus for monitoring driver fatigue in a vehicle having a steering control includes connecting a sensor with respect to the steering control and a controller with respect to the sensor. A steering input count signal and/or steering wheel rotation signal is provided from the sensor to the controller and an alarm is activated when the steering input count signal drops below a minimum level and/or the steering wheel rotation signal exceeds a maximum level. The alarm may trigger physical responses within the vehicle including audible, visual, engine management and/or similar responses.

Abstract: A detection apparatus and a method for detecting the rotation speed of a fan are disclosed. The detection apparatus comprises a photoelectric sensing unit, a processing unit, and a prompt unit. The photoelectric sensing unit senses the strength of a light beam reflected in response to the rotation of the fan to generate a frequency signal. The processing unit converts the frequency signal into a rotation speed signal, and determines whether the rotation speed falls within a certain range. If yes, the processing unit generates a first prompt signal, from which the prompt unit can show a message of normal operation. If no, the processing unit generates a second prompt signal, from which the prompt unit can show a message of abnormal operation.

Abstract: The invention is aimed at preventing apparatus damage, loss of data, accidental firing of a firearm due to dropping or subjection to an impact, and other mishaps caused by accidental dropping or improper handling of the apparatus, firearm, etc. due to carelessness on the side of users. To achieve this, a drop detecting means is provided that detects the dropping of the apparatus when the apparatus is dropped, and control is performed so as to set the apparatus in a safe condition in response to a drop detection signal supplied by the drop detecting means.

Abstract: A vehicle-trailer back-up control system that employs an active front steer sub-system. The system includes a smart hitch controller that receives a vehicle speed signal and a hand-wheel angle signal, and calculates a hitch angle command signal. The system further includes a hitch angle sensor that measures the hitch angle between the vehicle and the trailer that is compared to the hitch angle command signal to generate a hitch angle error signal. A PID control unit receives the hitch angle error signal, and generates a corrected road wheel angle signal based on proportional and derivative gains. The corrected road wheel angle signal is used to generate a motor angle signal that is applied to a steering actuator to be combined with the steering angle signal to generate the front wheel steering signal during a back-up maneuver.

Abstract: A method and apparatus for monitoring driver fatigue in a vehicle having a steering control includes connecting a sensor with respect to the steering control and a controller with respect to the sensor. A steering input count signal is provided from the sensor to the controller and an alarm is activated when the steering input count signal drops below a minimum level. The alarm may trigger physical responses within the vehicle including audible, visual, engine management and/or similar responses.

Abstract: The invention relates to a method for monitoring the area of technical rolling bodies, especially their supports, wherein the forces exerted in that area are detected with sensors in order to generate electrical energy and to detect changes in the state of the area. At least one of the sensors (2, 3, 4) arranged in the area of the technical rolling bodies is actively impinged upon with electrical energy and introduces impulses that can be evaluated in the support (1) of the sensor (2, 3, 4) working as actuator. Thus, impulses that can be evaluated can be detected at any given time by the sensors (2, 3, 4) in the area (1) of the technical rolling bodies during monitoring with an electrical evaluation unit.

Abstract: A tire air pressure detection device includes an ideal driving status calculating portion (3e) and a rotational status value compensating portion (3f). The ideal driving status calculating portion calculates an ideal status value (?id) corresponding to a slip value under an ideal driving status without tire slippage. The rational status value compensating portion calculates and ideal rotational status value under the ideal driving status without tire slip based on the regression line calculated by a regression line calculating portion (3d) and the ideal slip status value calculated by the ideal driving status calculating portion.

Abstract: A device for controlling an electronically switched motor which includes a coder (2) having a main multipole track (2a) and a so-called “revolution pip” multipole track (2b); a fixed sensor (3) delivering two digital position signals (A, B) and one revolution pip signal (C); a circuit for switching the currents in the phase windings of the motor which comprises 2*P*N switches; a control circuit for the switching circuit which is able to supply the switching signals for the switches which correspond to the state of the logic determined by the revolution pip signal (C) or by the position signals (A, B). The control device can be combined with a bearing and/or a motor equipped with such a device.

Abstract: A device for controlling an electronically switched motor comprising a coder (2) provided with a main multipole track (2a) and a so-called “revolution pip” multipole track (2b), the said tracks each comprising N identical sectors (2c) angularly distributed respectively over the entire circumference of the said tracks, the sectors (2c) of the revolution pip track (2b) each comprising M angularly distributed singularities (2b1), the M singularities (2b1) being distributed angularly so that the revolution pip signal (C) is arranged so as, in combination with the signals A and B, to define binary sequences of angular length less than that of the sectors (2c) and which represent the absolute angular position of the coder (2) on a sector (2c). The invention also relates to a bearing and a motor equipped with such a device, as well as a method for controlling such a motor.

Abstract: A control system for estimating the tongue length of a trailer being towed by a vehicle in connection with a front wheel steering with or without a coordinated rear wheel steering associated with the vehicle. The control signal system employs an algorithm that calculates an estimated hitch angle between the vehicle and the trailer based on an estimated tongue length, a front wheel steering angle, a rear wheel steering angle, a measured hitch angle, vehicle speed and vehicle yaw rate. The estimated hitch angle is compared to the measured hitch angle to generate a hitch angle error that is converted to a tongue length error. The tongue length error is compared to the estimated tongue length to become a corrected estimated tongue length for a next computation period. After a few seconds of processing, the corrected estimated tongue length will be the actual tongue length of the trailer.

Abstract: A tire air pressure detection device of the present invention includes a warning anticipation timing calculating portion for anticipating a warning timing at which tire air pressure decrease detecting portion will detect the tire air pressure decrease based on rotational status value compensated for by a rotational status value compensating portion. A tire air pressure decrease detecting portion detects a decrease in tire air pressure when a clocked determination time reaches the warning anticipation timing anticipated by the warning anticipation timing calculating portion.

Abstract: A sensor (36) for monitoring rotation of an object (16) about an axis (20) comprises a switch member (40) that is urged into a neutral position and is movable relative to the object (16). A direction of movement of the switch member (40) relative to the object (16) is indicative of a direction of rotation of the object (16). Inertia of the switch member (40) during initial rotation of the object (16) results in relative movement of the switch member (4) away from the neutral position. Centrifugal force during object (16) rotation further enhances the relative movement of the switch member (40). The sensor (36) also comprises a device (56) for monitoring a direction of movement of the switch member (40) and for providing a signal indicative thereof.

Abstract: Apparatus and method are disclosed for thermally managing a display. A display may be tiltably coupled to a base, and the display may have a tilt sensor disposed therein for providing a tilt output when the display is tilted beyond a tilt threshold. Further aspects include a temperature sensors disposed for providing a high- or low-temperature threshold output when the display the exceeds predetermined temperature thresholds. The disclosure provides for producing a warning signal to the user when sensed signals are positive, and for producing a sleep signal to protect the display from thermal damage.

Abstract: A method for establishing the angular position of the vehicle with the aid of at least one roll or rotation rate sensor, and which is checked in the course of a plausibility inspection, to check whether the integrated rotation rate signal is able to reproduce the actual angular position of the vehicle at all or whether it lies outside the angular range which may be considered for the actual angular position of the vehicle on the basis of the driving situation.

Abstract: The present invention introduces systems, as well as methods of operating such systems, within a communication device for evaluating movement of a body relative to an environment. According to an exemplary embodiment, the system comprises a sensor and a processor. The sensor, which is associable with the body, is operable to repeatedly sense accelerative phenomena of the body. The processor, which is associated with the sensor, is operable to process the sensed accelerative phenomena as a function of at least one accelerative event characteristic. The system, and, more particularly, the processor generates state indicia relative the environment, and determines whether the evaluated body movement is within environmental tolerance. In a preferred embodiment, the processor communicates various state indicia to a monitoring controller, preferably using at least one of a wired network and a wireless network. The monitoring controller cooperates with the processor to remotely monitor the body.

Abstract: A method for establishing the angular position of the vehicle with the aid of at least one roll or rotation rate sensor, and which is checked in the course of a plausibility inspection, to check whether the integrated rotation rate signal is able to reproduce the actual angular position of the vehicle at all or whether it lies outside the angular range which may be considered for the actual angular position of the vehicle on the basis of the driving situation.

Abstract: The golf club has a head and a shaft. A three axis linear accelerometer is mounted on the shaft adjacent to the head. The axis of one accelerometer is in parallel alignment with an axis of the shaft. A circuit board is attached to the shaft and the accelerometer. The circuit board includes a calibrator for calibrating at least the accelerometer with an axis parallel to the axis of the shaft. The circuit board also has a wireless transmitter. Data from the accelerometer is transferred to a processor by the transmitter. The measured velocity of the club head is displayed by a display device carried by the golfer.

Abstract: The invention relates to a digital sensor of relative position, which has a circular multipolar magnetic ring which is mobile in rotation opposite a stationary magnetic sensor comprised of at least two sensitive elements, respectively positioned facing a main track and a “revolution tick” reference track, and a device for processing of the output signals, such that on the magnetic ring, a magnetic pattern is produced from a pair of north and south poles whose transition is different from the transition between the other north and south poles of the magnetic ring, and of which the angular width of the north pole is different at the site of the “revolution tick” reference track. The sensitive elements can be three in number, the first of which faces reference track and of which the other two face the main track, or they can be produced in the form of two parallel bars.

Abstract: The chair tilt alarm 10 comprises a power supply 12 in electrical communication with an on-off switch 14, a tilt sensor 16, and an warning device 18. The warning device 18 will be activated when the chair 20 is tilted beyond a predetermined angular position 22. As the chair returns toward its righted position, the alarm will deactivate. The chair tilt alarm 10 can be shut off manually or remotely. The chair tilt alarm (10) is also equipped with data storage and transmission modules for reporting of chair tilting at a base station. The chair tilt alarm (10) is also equipped with a counter-balance system to correct the chair to an acceptable position.