Microcontroller-based low vacuum gauge

Date

10-2005

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Alvin Karlo G. Tapia

Abstract

A microcontroller-based vacuum-measuring device using solid-state pressure sensor was developed and constructed in this study. The device consisted of a sensor board and a controller board. The sensor board was composed of MPXV6115VC6U vacuum sensor that measures the pressure inside the vacuum chamber and ADS7813P 16-bit ADC that converts the analog reading of the sensor into digital signals. The controller board was composed of Z8F6401PMO20SC microcontroller that acquires and processes the raw data obtained from the sensor board. The controller board also handles the storage and retrieval of the data in non-volatile memory. A user interface block was also incorporated to the controller board to handle the input and output flow of data. The ADC was calibrated using a bench type digital multimeter and the equation obtained was applied in the system program for proper conversion of voltage values. The pressure sensor, on the other hand, was calibrated at the National Metrology Laboratory ITDI-DOST and was found out that the standard pressure and calculated pressure has a correlation coefficient of 0.999. The device was subjected to different tests before the device was set to gather data. This was done to ensure that the different modules were functioning properly. The device was then set-up to monitor the vacuum chamber for 15 minutes and pressure readings were saved to the device's memory. The data collected were retrieved from the device's memory and were plotted to a graph. The readings gathered by the device were comparable to the analog vacuum gauge readings. Thus, the device can be a substitute for expensive commercial vacuum gauges.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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