Self-powered light sensor for simultaneous intensity-and-direction sensing and maximum-energy harvesting with shared photodiodes

Self-powered light sensors are ubiquitous in internet-of-things applications for sustained operation without battery replacement. Figure 1 right shows an example, in which a museum needs thousands of light sensors to sense light intensity and direction for lighting control. Photodiodes (PDs) are inherently suited to both light sensing (LS) and light energy harvesting (LEH). Figure 1 top-left shows...