Abstract: A wireless data coupling system for transmitting data such as torque from a rotating shaft to a stationary receiver includes at least one photocell on the shaft along with a corresponding stationary light source for illuminating the photocells. This powers the rotating components. From a data standpoint an analog signal from a strain gauge is converted to a digital signal which is transmitted bit by bit by a pair of light emitting diodes one of which acts as a data sync. The stationary receiver contains columns of phototransistors to receive both the data and data sync pulses. Initiation of the transmission of data is started by a start pulse which occurs first in time and thereafter send pulses from the stationary system actuate the data and data sync pulses from the rotating system.