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 TiO
2
hetero junction of the type of gold-PS-TiO
2
-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.