Hitachi believes that the utilization of sensing technology is effective for meeting the various needs of society, and that the concept of using digital sensing to visualize sites is particularly important. Digital sensing can create new value by converting site data obtained from sensors into valuable site information, analyzing site challenges in the IT space, and using the results to control the site. This article discusses duct monitoring in factories as a specific example of digital sensing. It also presents a maintenance-free sensor node as an example of sensor node technology that implements digital sensing.