Abstract: The invention is a rotational sensor to sense an object's angle and methods to analyze the sensor output. The sensor has a first emitting source, to either emit onto, or from the object, a first receiving sensor, to receive emissions from the first emitting source, either directly or indirectly, the emissions received dependent on said angle, first receiving sensor outputting a first signal a course measurement of the angle. Also present is a second emitting source, to emit onto, or from the object and a second receiving sensor, to receive emissions from the second emitting source, either directly or indirectly the emissions received again dependent on said angle, second receiving sensor outputting a second signal, as a fine measurement of the angle. A method of use of the sensor is disclosed together with a method of combining the fine and course measurements to output a signal with zero error.

Abstract: The invention is a rotational sensor to sense an object's angle and methods to analyse the sensor output. The sensor has a first emitting source, to either emit onto, or from the object, a first receiving sensor, to receive emissions from the first emitting source, either directly or indirectly, the emissions received dependent on said angle, first receiving sensor outputting a first signal a course measurement of the angle. Also present is a second emitting source, to emit onto, or from the object and a second receiving sensor, to receive emissions from the second emitting source, either directly or indirectly the emissions received again dependent on said angle, second receiving sensor outputting a second signal, as a fine measurement of the angle. A method of use of the sensor is disclosed together with a method of combining the fine and course measurements to output a signal with zero error.

Abstract: Disclosed is a portable shelf that is capable of being attached to an interior portion of an automobile for accommodating articles thereon. The portable shelf comprises a receptacle, at least one extending member, and at least one attaching mechanism. The receptacle is capable of accommodating the articles thereon. The at least one extending member is horizontally attached to a portion of the receptacle. Further, the at least one attaching mechanism is coupled to a free end portion of the at least one extending member. Furthermore, the at least one attaching mechanism is capable of being detachably attached to the interior portion of the automobile. Upon detachably attaching the at least one attaching mechanism with the interior portion of the automobile, the portable shelf is being detachably attached to the interior portion of the automobile for accommodating the articles thereon.