Abstract: An instrumentation system for measuring the instantaneous pedal force and power exerted by the rider of a cycle is described. Being small and lightweight, it is intended to be mounted on the cycle and to operate while the cycle is ridden. The pedal crank assembly is modified to provide an elastic support for the chainring assembly, allowing a small relative rotation between pedals and chainrings when force is applied to the pedals. This rotation is a function of the magnitude of the force and is detected by angle detectors, consisting of angle indicators rotating with the pedal crank assembly and stationary sensors mounted on the cycle frame. These angle detectors measure the relative rotation at 25 or more positions distributed around a revolution of the pedal crank assembly. Electrical signals from the sensors are coupled to a microprocessor. The processor compares the signals, computes the applied pedal force and power at each measurement position, and displays and/or stores the results.

Abstract: A keyboard and keyboard system for use in an electronic device having a plurality of keys. A matrix of keys in rows and columns with each key being defined by an intersection of a row and column wire is used. Either the rows or columns function as initial inputs and the other of the rows or columns function as an initial driver. After a key press, the initial input is changed to a secondary driver and all initial drivers are changed to secondary inputs. The secondary inputs are then read to detect which key has been pressed and the row and the column are connected at the appropriate intersection representing the key which has been pressed. The keyboard system decodes each intersection to define the representation of each key and the representation is communicated to the associated electronic device. A method for detecting input from a keyboard is also disclosed.