Transmission of Data Using Distinct Intensity Levels in IR Radiations

This paper emphasizes over the usage of variation in Infrared radiations, for a multilevel logic transmission, as emitted by the Infrared LED along with the experimental analysis of the response and precision levels of the Infrared sensor (IR Photodiode). The voltage applied to the IR LED is varied over a range, fractioned into discrete levels, according to the data to be transmitted. Thus, a commensurate Infrared intensity lying in a unique margin is obtained as an output of the IR LED. The receiver employs a circuitry using the IR photodiode that detects and perceives the slightest variations in infrared radiations as falling upon it. Further, the data transmitted is recognized on the basis of voltage variations obtained across photodiode, as per the lookup table of the receiver microcontroller. As an extension, a particular amount of IR transmitted can be assigned to a specific pattern of binary data, thus augmenting the efficacy of the system.