Patent ID: 7072587
Filing Date: 2006-07-04
Classification: G09G,H01H,H04M,H04W,Y02D

Abstract:
1. An optical communications transceiver, comprising: means for periodically driving an LED in forward bias to emit light to transmit data; means for periodically not driving the LED in forward bias; and means for measuring a time interval, the time interval dependent on a change in capacitance of the LED, the change in capacitance proportional to an amount of light sensed by the LED, wherein the LED is coupled in series with a resistor and a microprocessor having a first I/O pin connected to the LED and a second I/O pin coupled to the resistor, and in which the microprocessor includes the means for periodically driving the LED in forward bias and the means for periodically not driving the LED in forward bias and the means for measuring the time interval.