detect rain leaves wet sensor. Due to the use of printing technology, there is a feature that can be manufactured at low cost in mass production in small lots. In addition to battery replacement is suppressed in unnecessary for maintenance cost is also minimal, there is no fear of contaminating the soil, such as by leakage of the battery. Optimization of irrigation of large-scale agriculture and high value-added crops, when the application, such as evaluation of happen if I do not know landslides and landslide risk can be expected.