Development of Microcontroller Based Potentiometric Indicator System for Piezoresistive MEMS Sensor

This paper presents the development of microcontroller based potentiometric indicator system for integration with piezoresistive MEMS sensor. The purpose system involved the integration between hardware and software subsystem. For hardware subsystem, the design of potentiometric circuit was tested using P-spice software and breadboard circuit. Then, the design was fabricated for printed circuit board. This finding was then used to develop interface for the analog-to-digital converter. For software subsystem, the stress level indicator system has been developed using PIC 16F873 by converting the output from potentiometric circuit into stress level with a look-up table based on fuzzy rule sets for measuring human stress. It computes the digital data conversion into desired reading and displays data through the second hardware subsystem which is liquid crystal display. From the experiment, a potentiometric indicator circuit designed for piezoresistive MEMS sensor for human stress was successfully developed.