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A microcontroller-based digital hygrometer system using a low-cost moisture sensor in the range of 3.7–100 ppm has been developed. The sensor is of capacitive type and consists of nanoporous thin film of alumina $(\gamma - \hbox{Al}_{2}\hbox{O}_{3})$ dip coated in between two parallel gold electrodes onto an alumina substrate. The behavior of the sensor has been modeled with an object to develop...
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