A Photodetector-based Automated Light Intensity Controlling System using IoT

Applications of photo detectors in various areas have greatly motivated its research and development. This paper reports a heterojunction based porous silicon (PS) and TiO2hetero junction of the type of gold-PS-TiO2-gold (metal semiconductor metal) structure. The response of the photo detector is tested in presence of room light, flash light and laser (wavelength between 630-670 nm) and sensitivity is found to be 66.66%, 84% and 126% respectively. Other sensor parameters have also been studied; for example, responsivity, response and recovery time. Further, the sensor output is integrated to a cloud-based IoT platform. A demonstration of sensing and control in an IoT network with use of a photodetector has been portrayed. This type of arrangement is found to be beneficial for applications where frequent human intervention is not possible.