부산대학교 도서관

We report an ultralightweight flexible sensory platform using bare die CMOS chips having a light, temperature, and humidity sensor on a flexible polymer substrate. An application-specified integrated circuit designed and fabricated in a 0.35- $\mu \text{m}$ process is used for signal acquisition, conditioning, and further transfer of data to a bare die microcontroller. The whole platform is powered by a bare die solid-state battery. This extremely lightweight (0.44 g), compact ($3\times1.5$ cm2), flexible, and mostly transparent platform can be unobtrusively placed on a leaf of a plant to monitor microclimate conditions surrounding a plant for accurate plant growth monitoring. The latter is successfully demonstrated by placing the platform on a plant leaf and monitoring changing environmental conditions (light, temperature, and humidity) for a whole day. [ABSTRACT FROM AUTHOR]